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#1
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Coax cable carries electrical current? What is wrong?
I got a good quality one to four video splitter so tonight I got up to the
attic and disconnected the old splitter. Nothing unusual. Then I connect the new cable IN, then one by one I connect the cable OUT. When I get to the last one I felt a strong tinkling on my finger, you know when you rub your shoe on the carpet a few times and go touch a metal railing? Yes that feeling...I dropped the splitter. Is it static? I don't know. So I touched the splitter, which at that time has the one IN cable and three OUT cables connected, and nothing, it's OK. Then I let go of the splitter and touch the last coax cable connector - nothing...so I touched the splitter with my left hand and the remaining cable connector with my right hand, yes I feel it again. What is going on? I then left the attic and when to the other end of that cable, which was at the time plugged into a VCR, which in turn was connected to the TV and they were running. I unplugged the connector on this end, went back to the attic and no more problem. So I hooked the last connector up. Then I came back down and put the cable connector back to the VCR. What caused this? Does this mean I have an electrical problem with that TV or VCR? Thanks, MC |
#2
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Coax cable carries electrical current? What is wrong?
miamicuse wrote:
I got a good quality one to four video splitter so tonight I got up to the attic and disconnected the old splitter. Nothing unusual. Then I connect the new cable IN, then one by one I connect the cable OUT. When I get to the last one I felt a strong tinkling on my finger, you know when you rub your shoe on the carpet a few times and go touch a metal railing? Yes that feeling...I dropped the splitter. Is it static? I don't know. So I touched the splitter, which at that time has the one IN cable and three OUT cables connected, and nothing, it's OK. Then I let go of the splitter and touch the last coax cable connector - nothing...so I touched the splitter with my left hand and the remaining cable connector with my right hand, yes I feel it again. What is going on? I then left the attic and when to the other end of that cable, which was at the time plugged into a VCR, which in turn was connected to the TV and they were running. I unplugged the connector on this end, went back to the attic and no more problem. So I hooked the last connector up. Then I came back down and put the cable connector back to the VCR. What caused this? Does this mean I have an electrical problem with that TV or VCR? Thanks, MC Cable systems are notorious for carrying ground loop currents. But it could also be a leaking bypass capacitor in one of the devices to which you connected (and which could comprise a hazard). I'd probably run the incoming cable connection through a ground block and see if that changes what you see/feel. You might find a Google search of cable "ground loop" interesting. -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . |
#3
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Coax cable carries electrical current? What is wrong?
On Wed, 23 Nov 2005 22:51:52 -0500, "miamicuse"
wrote: I got a good quality one to four video splitter so tonight I got up to the attic and disconnected the old splitter. Nothing unusual. Then I connect the new cable IN, then one by one I connect the cable OUT. When I get to the last one I felt a strong tinkling on my finger, you know when you rub your shoe on the carpet a few times and go touch a metal railing? Yes that feeling...I dropped the splitter. Is it static? I don't know. So I touched the splitter, which at that time has the one IN cable and three OUT cables connected, and nothing, it's OK. Then I let go of the splitter and touch the last coax cable connector - nothing...so I touched the splitter with my left hand and the remaining cable connector with my right hand, yes I feel it again. What is going on? I then left the attic and when to the other end of that cable, which was at the time plugged into a VCR, which in turn was connected to the TV and they were running. I unplugged the connector on this end, went back to the attic and no more problem. So I hooked the last connector up. Then I came back down and put the cable connector back to the VCR. What caused this? Does this mean I have an electrical problem with that TV or VCR? Thanks, MC Although Coax Cables are routinely configured to carry DC for satellite dish LNA's and LNB's, your problem sounds like a ground fault (one or more of your devices) is not grounded properly. It could be the device itself or it could be that the electrical outlet the device is plugged into has a poor or non-existent ground. If your source is Cable TV, the ground fault could be coming into your house from the cable company. Get a voltmeter and check for potential difference between the outer conductors shield before you connect. This is more accurate than getting "shocked". Beachcomber |
#4
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Coax cable carries electrical current? What is wrong?
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#5
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Coax cable carries electrical current? What is wrong?
Use a voltmeter to find where its from. Dont use the bad unit or call
the cable co if its from their end. Let us know what you find. |
#7
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Coax cable carries electrical current? What is wrong?
On Wed, 23 Nov 2005 22:51:52 -0500, "miamicuse"
wrote: I got a good quality one to four video splitter so tonight I got up to the attic and disconnected the old splitter. Nothing unusual. Then I connect the new cable IN, then one by one I connect the cable OUT. When I get to the last one I felt a strong tinkling on my finger, you know when you rub your shoe on the carpet a few times and go touch a metal railing? Yes that feeling...I dropped the splitter. Is it static? I don't know. So I touched the splitter, which at that time has the one IN cable and three OUT cables connected, and nothing, it's OK. Then I let go of the splitter and touch the last coax cable connector - nothing...so I touched the splitter with my left hand and the remaining cable connector with my right hand, yes I feel it again. What is going on? I then left the attic and when to the other end of that cable, which was at the time plugged into a VCR, which in turn was connected to the TV and they were running. I unplugged the connector on this end, went back to the attic and no more problem. So I hooked the last connector up. Then I came back down and put the cable connector back to the VCR. What caused this? Does this mean I have an electrical problem with that TV or VCR? Thanks, MC In the past I have felt voltage when connecting my cable. There would be a noticeable voltage between the cable shields (you'd feel it if holding a splitter while screwing the cable on). This problem seems to have gone away since the cable company (Cox now) replaced the coax and added a ground block. -- 31 days until the winter solstice celebration Mark Lloyd http://notstupid.laughingsquid.com "Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well armed lamb contesting the vote." - Benjamin Franklin |
#8
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Coax cable carries electrical current? What is wrong?
Ross Mac wrote:
wrote in message ... On Thu, 24 Nov 2005 05:25:45 GMT, (Beachcomber) wrote: On Wed, 23 Nov 2005 22:51:52 -0500, "miamicuse" wrote: I got a good quality one to four video splitter so tonight I got up to the attic and disconnected the old splitter. Nothing unusual. Then I connect the new cable IN, then one by one I connect the cable OUT. When I get to the last one I felt a strong tinkling on my finger, you know when you rub your shoe on the carpet a few times and go touch a metal railing? Yes that feeling...I dropped the splitter. Is it static? I don't know. So I touched the splitter, which at that time has the one IN cable and three OUT cables connected, and nothing, it's OK. Then I let go of the splitter and touch the last coax cable connector - nothing...so I touched the splitter with my left hand and the remaining cable connector with my right hand, yes I feel it again. What is going on? I then left the attic and when to the other end of that cable, which was at the time plugged into a VCR, which in turn was connected to the TV and they were running. I unplugged the connector on this end, went back to the attic and no more problem. So I hooked the last connector up. Then I came back down and put the cable connector back to the VCR. What caused this? Does this mean I have an electrical problem with that TV or VCR? Thanks, MC Although Coax Cables are routinely configured to carry DC for satellite dish LNA's and LNB's, your problem sounds like a ground fault (one or more of your devices) is not grounded properly. It could be the device itself or it could be that the electrical outlet the device is plugged into has a poor or non-existent ground. If your source is Cable TV, the ground fault could be coming into your house from the cable company. Get a voltmeter and check for potential difference between the outer conductors shield before you connect. This is more accurate than getting "shocked". Beachcomber VCR's are never grounded. Test that first. If it has a standard plug, reverse the plug and test again. If its polarized (one prong wider), your outlet might be reverse wired. Mark I tend to agree with the above post that your problem might be a reversed neutral / hot connection. Since the VCR probably has a polarity plug just maybe your outlet has the hot and neutral switched. Carefully pop the plate and pull the outlet from the box. Take a meter and insert the probe into the large prong socket and place the other probe on the bare or green ground wire. If you see more than a couple of volts like maybe 110 or more than you need to switch the wires. Good luck, Ross Better still, go to HD/Lowes and get one of the $10 neon testers that will quickly tell you whether all the wires in your outlets are properly connected. -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . |
#9
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Coax cable carries electrical current? What is wrong?
"Mark Lloyd" wrote in message ... On Wed, 23 Nov 2005 22:51:52 -0500, "miamicuse" wrote: I got a good quality one to four video splitter so tonight I got up to the attic and disconnected the old splitter. Nothing unusual. Then I connect the new cable IN, then one by one I connect the cable OUT. When I get to the last one I felt a strong tinkling on my finger, you know when you rub your shoe on the carpet a few times and go touch a metal railing? Yes that feeling...I dropped the splitter. Is it static? I don't know. So I touched the splitter, which at that time has the one IN cable and three OUT cables connected, and nothing, it's OK. Then I let go of the splitter and touch the last coax cable connector - nothing...so I touched the splitter with my left hand and the remaining cable connector with my right hand, yes I feel it again. What is going on? I then left the attic and when to the other end of that cable, which was at the time plugged into a VCR, which in turn was connected to the TV and they were running. I unplugged the connector on this end, went back to the attic and no more problem. So I hooked the last connector up. Then I came back down and put the cable connector back to the VCR. What caused this? Does this mean I have an electrical problem with that TV or VCR? Thanks, MC In the past I have felt voltage when connecting my cable. There would be a noticeable voltage between the cable shields (you'd feel it if holding a splitter while screwing the cable on). This problem seems to have gone away since the cable company (Cox now) replaced the coax and added a ground block. -- 31 days until the winter solstice celebration Mark Lloyd http://notstupid.laughingsquid.com "Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well armed lamb contesting the vote." - Benjamin Franklin If the problem is with the cable company end, wouldn't I have the same problem when I am connecting the splitter with the other three TV cables? I only experienced this problem when I tried to screw on the very last cable connector. MC |
#10
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Coax cable carries electrical current? What is wrong?
Better still, go to HD/Lowes and get one of the $10 neon testers that
will quickly tell you whether all the wires in your outlets are properly connected. -- What is that called? I might do that and if reversed I can reverse it. Thanks, MC |
#11
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Coax cable carries electrical current? What is wrong?
miamicuse wrote:
Better still, go to HD/Lowes and get one of the $10 neon testers that will quickly tell you whether all the wires in your outlets are properly connected. -- What is that called? I might do that and if reversed I can reverse it. Thanks, MC http://www.homedepot.com/prel80/HDUS...D=9876&pos=n01 If that link doesn't work, it's described as a "Gardner Bender 3-Wire Circuit Analyzer Model GRT-500A Price: $4.95/ea" -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . |
#12
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Coax cable carries electrical current? What is wrong?
CJT wrote:
miamicuse wrote: Better still, go to HD/Lowes and get one of the $10 neon testers that will quickly tell you whether all the wires in your outlets are properly connected. -- What is that called? I might do that and if reversed I can reverse it. Thanks, MC http://www.homedepot.com/prel80/HDUS...D=9876&pos=n01 If that link doesn't work, it's described as a "Gardner Bender 3-Wire Circuit Analyzer Model GRT-500A Price: $4.95/ea" While you're there, you might consider also getting one of these and installing it: http://www.cablesnmor.com/f-ground-block.html I couldn't find it on the HD/Lowes sites, but I'm pretty sure they have them in the stores. -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . |
#13
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Coax cable carries electrical current? What is wrong?
On Wed, 23 Nov 2005 22:51:52 -0500, "miamicuse"
wrote: I got a good quality one to four video splitter so tonight I got up to the attic and disconnected the old splitter. Nothing unusual. Then I connect the new cable IN, then one by one I connect the cable OUT. When I get to the last one I felt a strong tinkling on my finger, you know when you rub your shoe on the carpet a few times and go touch a metal railing? Yes that feeling...I dropped the splitter. Is it static? I don't know. So I touched the splitter, which at that time has the one IN cable and three OUT cables connected, and nothing, it's OK. Then I let go of the splitter and touch the last coax cable connector - nothing...so I touched the splitter with my left hand and the remaining cable connector with my right hand, yes I feel it again. What is going on? In this case, it was low voltage, but you'd better damn well get out of the habit of using two hands to test voltage. If you want to do this again use only one hand, and probably the most you'll get is a burn. If you use two hands and it's a substantial voltage AC or DC, you're running the current right though your heart. That's one way people get killed by electicity. if there wasn't supposed to be any voltage there and there is, there' little reason to assume it will be low voltage, since it's not supposed to be there in the first place. You actually specifiy that you used your left and for one and your right hand for the other. You would have felt it with just one hand. Why risk your life? Better yet, get a meter. I then left the attic and when to the other end of that cable, which was at the time plugged into a VCR, which in turn was connected to the TV and they were running. I unplugged the connector on this end, went back to the attic and no more problem. So I hooked the last connector up. Then I came back down and put the cable connector back to the VCR. What caused this? Does this mean I have an electrical problem with that TV or VCR? Thanks, MC Remove NOPSAM to email me. Please let me know if you have posted also. |
#14
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Coax cable carries electrical current? What is wrong?
mm wrote: On Wed, 23 Nov 2005 22:51:52 -0500, "miamicuse" wrote: I got a good quality one to four video splitter so tonight I got up to the attic and disconnected the old splitter. Nothing unusual. Then I connect the new cable IN, then one by one I connect the cable OUT. When I get to the last one I felt a strong tinkling on my finger, you know when you rub your shoe on the carpet a few times and go touch a metal railing? Yes that feeling...I dropped the splitter. Is it static? I don't know. So I touched the splitter, which at that time has the one IN cable and three OUT cables connected, and nothing, it's OK. Then I let go of the splitter and touch the last coax cable connector - nothing...so I touched the splitter with my left hand and the remaining cable connector with my right hand, yes I feel it again. What is going on? You are probably feeling the normal small amount of leakage current from the VCR flowing to the grounded CATV line. If it was a small tingle and didn't knock you on your butt, its normal. Mark |
#15
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Coax cable carries electrical current? What is wrong?
most likely you have AC voltage from your appliance trying to get thru
you to the grounded side [the outside] of your cable. to eliminate worry try plugging your appliance into a portable GFI and then connect the cable. if the appliance continues to operate without tripping the GFI, half your worries are over. |
#16
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Coax cable carries electrical current? What is wrong?
On 24 Nov 2005 20:41:13 -0800, "Mark" wrote:
mm wrote: On Wed, 23 Nov 2005 22:51:52 -0500, "miamicuse" wrote: I got a good quality one to four video splitter so tonight I got up to the attic and disconnected the old splitter. Nothing unusual. Then I connect the new cable IN, then one by one I connect the cable OUT. When I get to the last one I felt a strong tinkling on my finger, you know when you rub your shoe on the carpet a few times and go touch a metal railing? Yes that feeling...I dropped the splitter. Is it static? I don't know. So I touched the splitter, which at that time has the one IN cable and three OUT cables connected, and nothing, it's OK. Then I let go of the splitter and touch the last coax cable connector - nothing...so I touched the splitter with my left hand and the remaining cable connector with my right hand, yes I feel it again. What is going on? You are probably feeling the normal small amount of leakage current from the VCR flowing to the grounded CATV line. If it was a small tingle and didn't knock you on your butt, its normal. But don't hold unknown coax in your mouth. Mark -- 30 days until the winter solstice celebration Mark Lloyd http://notstupid.laughingsquid.com "Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well armed lamb contesting the vote." - Benjamin Franklin |
#17
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Coax cable carries electrical current? What is wrong?
Actually, it's not unusual to find small currents in coax. Most
signal amplifiers in fact, use the coax to power the amplifier so the amp can be placed close to the antenna and the power supply at the equipment. It's also subject to fantom voltages, just as power wiring is. Try putting any light bulb (a nightlight is easy to use) across the voltage: If the voltage goes away, it's phantom power. If the voltage doesn't completely go away, then it bears looking into a little more. My bet is it'll go away completely. "Mark" wrote in message ups.com... : : mm wrote: : On Wed, 23 Nov 2005 22:51:52 -0500, "miamicuse" : wrote: : : I got a good quality one to four video splitter so tonight I got up to the : attic and disconnected the old splitter. Nothing unusual. : : Then I connect the new cable IN, then one by one I connect the cable OUT. : When I get to the last one I felt a strong tinkling on my finger, you know : when you rub your shoe on the carpet a few times and go touch a metal : railing? Yes that feeling...I dropped the splitter. Is it static? I don't : know. So I touched the splitter, which at that time has the one IN cable : and three OUT cables connected, and nothing, it's OK. Then I let go of the : splitter and touch the last coax cable connector - nothing...so I touched : the splitter with my left hand and the remaining cable connector with my : right hand, yes I feel it again. What is going on? : : : : You are probably feeling the normal small amount of leakage current : from the VCR flowing to the grounded CATV line. : : If it was a small tingle and didn't knock you on your butt, its normal. : : Mark : |
#18
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Coax cable carries electrical current? What is wrong?
On 25-Nov-2005, "buffalobill" wrote: to eliminate worry try plugging your appliance into a portable GFI and then connect the cable. if the appliance continues to operate without tripping the GFI, half your worries are over. If you have a non-polarized two-prong plug on the power cable, first try reversing it. That may provide proper grounding. I've seen this kind of grounding problem with older audio equipment. I've never found out why, but know that unless all the related audio gear is plugged in with the same plug orientation, you get current leakage. Mike |
#19
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Coax cable carries electrical current? What is wrong?
Good catch, Mike; I'd forgotten about that one. I'll bet that's
the source. Pop "Michael Daly" wrote in message ... : : On 25-Nov-2005, "buffalobill" wrote: : : to eliminate worry try plugging your appliance into a portable GFI and : then connect the cable. if the appliance continues to operate without : tripping the GFI, half your worries are over. : : If you have a non-polarized two-prong plug on the power cable, first : try reversing it. That may provide proper grounding. I've seen this : kind of grounding problem with older audio equipment. I've never : found out why, but know that unless all the related audio gear is : plugged in with the same plug orientation, you get current leakage. : : Mike |
#20
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Coax cable carries electrical current? What is wrong?
"Michael Daly" wrote in message ... On 25-Nov-2005, "buffalobill" wrote: to eliminate worry try plugging your appliance into a portable GFI and then connect the cable. if the appliance continues to operate without tripping the GFI, half your worries are over. If you have a non-polarized two-prong plug on the power cable, first try reversing it. That may provide proper grounding. I've seen this kind of grounding problem with older audio equipment. I've never found out why, but know that unless all the related audio gear is plugged in with the same plug orientation, you get current leakage. Mike I have a TV, a DVD player and a VHS player hooked up at that location. All the plugs have a "wide" leg and a "skinny" leg. They are all plugged into a six port surge protector which is plugged into a single outlet. The coax cable from the attic feeds into the VHS player, and another coax goes from the VHS player to the TV. If I unplug the cable to the VHS player but plug it into the TV directly, there is no current. I bought a $5.00 three wire circult analyzer and plugged it into the surge protector outlet and the two yellow light lit up but not the red light. So if I am reading the instructions right it means it's wired correctly. Where should I go look next? Thanks, MC |
#21
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Coax cable carries electrical current? What is wrong?
On 28-Nov-2005, "miamicuse" wrote: If I unplug the cable to the VHS player but plug it into the TV directly, there is no current. No current where? - at the TV or out of the short coax coming out of the VCR? If the latter, it might be the current is coming in the cable from outside. Otherwise, you might have a problem inside your VCR. Try grounding the cable at the splitter - the case of the splitter should be grounded so you just have to connect a line to a good ground. See if that draws off the current you feel. It could be that the outside cable is not at the same ground potential as your house. If you have wiring in the attic that is grounded at a junction box or box for a switch, you could attach to that - I don't know if that is acceptable as far as electrical codes go, but would be suitable for a test. The power in the cable should be pretty low, so codes might not be a problem - someone who knows will probably chime in. BTW - the other stuff you mentioned suggests it isn't a problem with your electrical system and VCR/DVD/TV hardware having different polarities or that your electrical outlets are wired backwards. Mike |
#22
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Coax cable carries electrical current? What is wrong?
"Michael Daly" wrote in message ...
On 28-Nov-2005, "miamicuse" wrote: If I unplug the cable to the VHS player but plug it into the TV directly, there is no current. No current where? - at the TV or out of the short coax coming out of the VCR? If the latter, it might be the current is coming in the cable from outside. That's almost certainly the problem. Try grounding the cable at the splitter And the solution. |
#23
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Coax cable carries electrical current? What is wrong?
I don't have the original post, but one glaring fact is
repeated in all responses read. First inspected is coax cable where it enter the building. As even required by National Electrical Code (NEC), that cable must connect to same earth ground used by telephone and AC electric breaker box. This hardwire connects cable ground block where cable enters the building. Even connection via a faucet or water pipe is not acceptable nor sufficient. It must be a dedicated and conductive ground connection - less than 20 feet per NEC. All incoming utilities must make direct connections to a common ground. That means no utility will float to a different voltage. This grounding required so that humans don't get electrical shocks (human safety) AND so that household transistors are not damaged (transistor safety). Every cable appliance should be galvanically isolated from cable. That means, even if power plug is reversed (what that three light tester tests), still, no significant current should exist on coax. Notice redundant layers of protection. AC power plug properly polarized. Coax cable connection galvanically isolated. Cable earthed before entering house. To be shocked, multiple problems may exist. This sentence is very important to your analysis. Multiple problems may exist to create shocks. Curious that current does not occur when one appliance is connected through another. That suggests one appliance has an internal fault. A fault made irrelevant by galvanic isolation in the second (electrically closer) appliance. Most of your previous responses are shotgunning - try this and try that. Nonsense. Start that the most important part and proceed in an organized manner. Does AC electric, telephone, and coax cable all connect to same earth ground before entering the building? This may or may not be a solution. But you cannot test for it. Visually inspect this requirement; correct as necessary. Then move on to other possible reasons for failure. Remember, to have a problem, you would have multiple failures. Find at least two. Maybe unfix the first located solution so that you can find the other failure. Meanwhile, what does that six outlet protector do? Makes the typically destructive surge easier to damage transistors. It does protect from a type of surge that typically does not damage transistors. That being sufficient to claim it is a surge protector - and for you to 'assume' it protects from all kinds of surges. The best power strip is about $3+ dollars from Walmart, Lowes, or Home Depot; has the all so critical 15 amp circuit breaker (for human protection); and has UL approval. Review what some power strip protectors have done previously. Where is your's located - behind the furniture in a dust pile? http://www.westwhitelandfire.com/Art...Protectors.pdf http://www.nmsu.edu/~safety/programs...tectorfire.htm http://www.ehs.washington.edu/LabSaf/surge.htm http://www.hanford.gov/rl/?page=556&parent=554 Internal protection already inside electronics can be overwhelmed if destructive transients are not earth before entering the building. Effective protection makes a 'less than 10 foot' connection to that common earth ground inspected above. Effective 'whole house' protectors have responsible manufacturer names such as Square D, Leviton, Polyphaser, Intermatic (in Home Depot), Siemens, and GE and Cutler Hammer (Lowes). They also cost tens of times less money per protected appliance compared to the ineffective and highly touted plug-in protector names. Don't make assumptions about that three light tester. It can detect failures BUT it cannot fully prove a receptacle is wired correctly. It can detect a wiring problem but cannot prove wiring as correct. What tester does report suggests receptacle polarity reversal is not a problem. It does not say, for example, that necessary safety ground from breaker box to earth is installed or exists. For that failure - one possible reason for the problem - you must visually inspect then entire connection from breaker box to earth ground. miamicuse wrote: I have a TV, a DVD player and a VHS player hooked up at that location. All the plugs have a "wide" leg and a "skinny" leg. They are all plugged into a six port surge protector which is plugged into a single outlet. The coax cable from the attic feeds into the VHS player, and another coax goes from the VHS player to the TV. If I unplug the cable to the VHS player but plug it into the TV directly, there is no current. I bought a $5.00 three wire circult analyzer and plugged it into the surge protector outlet and the two yellow light lit up but not the red light. So if I am reading the instructions right it means it's wired correctly. Where should I go look next? |
#24
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Coax cable carries electrical current? What is wrong?
w_tom wrote:
a few points ... (there may be others) snipThe best power strip is about $3+ dollars from Walmart, Lowes, or Home Depot; has the all so critical 15 amp circuit breaker (for human protectionsnip .... from fires, but which does nothing about electrocution). Don't make assumptions about that three light tester. It can detect failures BUT it cannot fully prove a receptacle is wired correctly. It can detect a wiring problem but cannot prove wiring as correct. What tester does report suggests receptacle polarity reversal is not a problem. It does not say, for example, that necessary safety ground from breaker box to earth is installed or exists. .... but it does indicate that the neutral and ground are at (approximately) the same potential, and that said potential is greater than about 65V away from the "hot." Unless the ground and neutral are connected together at the receptacle or upstream (but before the breaker box, where they _should_ be), that _does_ say something about the presence of a ground. For that failure - one possible reason for the problem - you must visually inspect then entire connection from breaker box to earth ground. snip One would, of course, hope that an inspector had already done that before the circuit was energized, but humans are admittedly frail. IMHO, your best point was that multiple protective measures should be in place (the inspector being one I think you missed). -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . |
#25
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Coax cable carries electrical current? What is wrong?
"Michael Daly" wrote in message ... On 28-Nov-2005, "miamicuse" wrote: If I unplug the cable to the VHS player but plug it into the TV directly, there is no current. No current where? - at the TV or out of the short coax coming out of the VCR? If the latter, it might be the current is coming in the cable from outside. Otherwise, you might have a problem inside your VCR. Well that does not compute either. Because I have the cable feed coming in from the outside and into the splitter. If I hold onto the outside cable and splitter, I do not feel this mild voltage spike. Now this splitter splits into four cables which connects to four TVs. Let's say we have cable A, B, C, D. I take cable A, and connect to splitter. Nothing, no voltage. Repeat for cable B, nothing. Repeat for cable C, nothing. Now I go grab the last cable, cable D, and I feel the voltage. I only feel it when I have outside cable + splitter in one hand and cable D in another. I let go of cable D, nothing. I let go of the splitter and only hold cable D, nothing either. Does this mean it might not be the outside cable grounding since cable A, B, C do not have this problem? Now I go to the other end of cable D which is connected to the VCR which then feeds to the TV. I disconnected that end. Go back to the attic. Touch both the splitter and cable D. Nothing. Then I went back down and connect cable D directly to the TV bypassing the VCR player, then back to the attic and try again, nothing. Then I wired it back to the VCR, repeat - yes I feel the voltage. Does this experiment conclude the problem is VCR player? Try grounding the cable at the splitter - the case of the splitter should be grounded so you just have to connect a line to a good ground. See if that draws off the current you feel. It could be that the outside cable is not at the same ground potential as your house. If you have wiring in the attic that is grounded at a junction box or box for a switch, you could attach to that - I don't know if that is acceptable as far as electrical codes go, but would be suitable for a test. The power in the cable should be pretty low, so codes might not be a problem - someone who knows will probably chime in. BTW - the other stuff you mentioned suggests it isn't a problem with your electrical system and VCR/DVD/TV hardware having different polarities or that your electrical outlets are wired backwards. Mike |
#26
Posted to alt.home.repair
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Coax cable carries electrical current? What is wrong?
"CJT" wrote in message ... w_tom wrote: a few points ... (there may be others) snipThe best power strip is about $3+ dollars from Walmart, Lowes, or Home Depot; has the all so critical 15 amp circuit breaker (for human protectionsnip ... from fires, but which does nothing about electrocution). Don't make assumptions about that three light tester. It can detect failures BUT it cannot fully prove a receptacle is wired correctly. It can detect a wiring problem but cannot prove wiring as correct. What tester does report suggests receptacle polarity reversal is not a problem. It does not say, for example, that necessary safety ground from breaker box to earth is installed or exists. ... but it does indicate that the neutral and ground are at (approximately) the same potential, and that said potential is greater than about 65V away from the "hot." Unless the ground and neutral are connected together at the receptacle or upstream (but before the breaker box, where they _should_ be), that _does_ say something about the presence of a ground. For that failure - one possible reason for the problem - you must visually inspect then entire connection from breaker box to earth ground. snip One would, of course, hope that an inspector had already done that before the circuit was energized, but humans are admittedly frail. IMHO, your best point was that multiple protective measures should be in place (the inspector being one I think you missed). -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . Hmm...sorry but I understood about 20% of the above post - got a bit too technical for me... I am the OP here is the original post: I got a good quality one to four video splitter so tonight I got up to the attic and disconnected the old splitter. Nothing unusual. Then I connect the new cable IN, then one by one I connect the cable OUT. When I get to the last one I felt a strong tinkling on my finger, you know when you rub your shoe on the carpet a few times and go touch a metal railing? Yes that feeling...I dropped the splitter. Is it static? I don't know. So I touched the splitter, which at that time has the one IN cable and three OUT cables connected, and nothing, it's OK. Then I let go of the splitter and touch the last coax cable connector - nothing...so I touched the splitter with my left hand and the remaining cable connector with my right hand, yes I feel it again. What is going on? I then left the attic and when to the other end of that cable, which was at the time plugged into a VCR, which in turn was connected to the TV and they were running. I unplugged the connector on this end, went back to the attic and no more problem. So I hooked the last connector up. Then I came back down and put the cable connector back to the VCR. What caused this? Does this mean I have an electrical problem with that TV or VCR? Here are some additional tests I did afterwards: Well that does not compute either. Because I have the cable feed coming in from the outside and into the splitter. If I hold onto the outside cable and splitter, I do not feel this mild voltage spike. Now this splitter splits into four cables which connects to four TVs. Let's say we have cable A, B, C, D. I take cable A, and connect to splitter. Nothing, no voltage. Repeat for cable B, nothing. Repeat for cable C, nothing. Now I go grab the last cable, cable D, and I feel the voltage. I only feel it when I have outside cable + splitter in one hand and cable D in another. I let go of cable D, nothing. I let go of the splitter and only hold cable D, nothing either. Does this mean it might not be the outside cable grounding since cable A, B, C do not have this problem? Now I go to the other end of cable D which is connected to the VCR which then feeds to the TV. I disconnected that end. Go back to the attic. Touch both the splitter and cable D. Nothing. Then I went back down and connect cable D directly to the TV bypassing the VCR player, then back to the attic and try again, nothing. Then I wired it back to the VCR, repeat - yes I feel the voltage. Does this experiment conclude the problem is VCR player? MC MC |
#27
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Coax cable carries electrical current? What is wrong?
Good god man, just find a source of ground in your attic. Hold
the splitter -- with the input connected and no outputs, touch the ground source and see if you feel anything. If so, your incoming cable isn't grounded properly (common problem). Simply attach the splitter to the source of ground and you're done. "miamicuse" wrote in message ... "CJT" wrote in message ... w_tom wrote: a few points ... (there may be others) snipThe best power strip is about $3+ dollars from Walmart, Lowes, or Home Depot; has the all so critical 15 amp circuit breaker (for human protectionsnip ... from fires, but which does nothing about electrocution). Don't make assumptions about that three light tester. It can detect failures BUT it cannot fully prove a receptacle is wired correctly. It can detect a wiring problem but cannot prove wiring as correct. What tester does report suggests receptacle polarity reversal is not a problem. It does not say, for example, that necessary safety ground from breaker box to earth is installed or exists. ... but it does indicate that the neutral and ground are at (approximately) the same potential, and that said potential is greater than about 65V away from the "hot." Unless the ground and neutral are connected together at the receptacle or upstream (but before the breaker box, where they _should_ be), that _does_ say something about the presence of a ground. For that failure - one possible reason for the problem - you must visually inspect then entire connection from breaker box to earth ground. snip One would, of course, hope that an inspector had already done that before the circuit was energized, but humans are admittedly frail. IMHO, your best point was that multiple protective measures should be in place (the inspector being one I think you missed). -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . Hmm...sorry but I understood about 20% of the above post - got a bit too technical for me... I am the OP here is the original post: I got a good quality one to four video splitter so tonight I got up to the attic and disconnected the old splitter. Nothing unusual. Then I connect the new cable IN, then one by one I connect the cable OUT. When I get to the last one I felt a strong tinkling on my finger, you know when you rub your shoe on the carpet a few times and go touch a metal railing? Yes that feeling...I dropped the splitter. Is it static? I don't know. So I touched the splitter, which at that time has the one IN cable and three OUT cables connected, and nothing, it's OK. Then I let go of the splitter and touch the last coax cable connector - nothing...so I touched the splitter with my left hand and the remaining cable connector with my right hand, yes I feel it again. What is going on? I then left the attic and when to the other end of that cable, which was at the time plugged into a VCR, which in turn was connected to the TV and they were running. I unplugged the connector on this end, went back to the attic and no more problem. So I hooked the last connector up. Then I came back down and put the cable connector back to the VCR. What caused this? Does this mean I have an electrical problem with that TV or VCR? Here are some additional tests I did afterwards: Well that does not compute either. Because I have the cable feed coming in from the outside and into the splitter. If I hold onto the outside cable and splitter, I do not feel this mild voltage spike. Now this splitter splits into four cables which connects to four TVs. Let's say we have cable A, B, C, D. I take cable A, and connect to splitter. Nothing, no voltage. Repeat for cable B, nothing. Repeat for cable C, nothing. Now I go grab the last cable, cable D, and I feel the voltage. I only feel it when I have outside cable + splitter in one hand and cable D in another. I let go of cable D, nothing. I let go of the splitter and only hold cable D, nothing either. Does this mean it might not be the outside cable grounding since cable A, B, C do not have this problem? Now I go to the other end of cable D which is connected to the VCR which then feeds to the TV. I disconnected that end. Go back to the attic. Touch both the splitter and cable D. Nothing. Then I went back down and connect cable D directly to the TV bypassing the VCR player, then back to the attic and try again, nothing. Then I wired it back to the VCR, repeat - yes I feel the voltage. Does this experiment conclude the problem is VCR player? MC MC |
#28
Posted to alt.home.repair
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Coax cable carries electrical current? What is wrong?
miamicuse wrote:
"Michael Daly" wrote in message ... On 28-Nov-2005, "miamicuse" wrote: If I unplug the cable to the VHS player but plug it into the TV directly, there is no current. No current where? - at the TV or out of the short coax coming out of the VCR? If the latter, it might be the current is coming in the cable from outside. Otherwise, you might have a problem inside your VCR. Well that does not compute either. Because I have the cable feed coming in from the outside and into the splitter. If I hold onto the outside cable and splitter, I do not feel this mild voltage spike. Now this splitter splits into four cables which connects to four TVs. Let's say we have cable A, B, C, D. I take cable A, and connect to splitter. Nothing, no voltage. Repeat for cable B, nothing. Repeat for cable C, nothing. Now I go grab the last cable, cable D, and I feel the voltage. I only feel it when I have outside cable + splitter in one hand and cable D in another. I let go of cable D, nothing. I let go of the splitter and only hold cable D, nothing either. Does this mean it might not be the outside cable grounding since cable A, B, C do not have this problem? Now I go to the other end of cable D which is connected to the VCR which then feeds to the TV. I disconnected that end. Go back to the attic. Touch both the splitter and cable D. Nothing. Then I went back down and connect cable D directly to the TV bypassing the VCR player, then back to the attic and try again, nothing. Then I wired it back to the VCR, repeat - yes I feel the voltage. Does this experiment conclude the problem is VCR player? Sure sounds like it. Disconnect the VCR from everything else and measure the voltage between its chassis and ground (e.g. the safety ground of one of the receptacles you've tested). But first STOP USING YOUR BODY AS A TESTER. You're gonna electrocute yourself. Harbor Freight has meters for 4 bucks +/-. That's pretty cheap if it saves your life. Try grounding the cable at the splitter - the case of the splitter should be grounded so you just have to connect a line to a good ground. See if that draws off the current you feel. It could be that the outside cable is not at the same ground potential as your house. If you have wiring in the attic that is grounded at a junction box or box for a switch, you could attach to that - I don't know if that is acceptable as far as electrical codes go, but would be suitable for a test. The power in the cable should be pretty low, so codes might not be a problem - someone who knows will probably chime in. BTW - the other stuff you mentioned suggests it isn't a problem with your electrical system and VCR/DVD/TV hardware having different polarities or that your electrical outlets are wired backwards. Mike -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . |
#29
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Coax cable carries electrical current? What is wrong?
miamicuse wrote:
"CJT" wrote in message ... w_tom wrote: a few points ... (there may be others) snipThe best power strip is about $3+ dollars from Walmart, Lowes, or Home Depot; has the all so critical 15 amp circuit breaker (for human protectionsnip ... from fires, but which does nothing about electrocution). Don't make assumptions about that three light tester. It can detect failures BUT it cannot fully prove a receptacle is wired correctly. It can detect a wiring problem but cannot prove wiring as correct. What tester does report suggests receptacle polarity reversal is not a problem. It does not say, for example, that necessary safety ground from breaker box to earth is installed or exists. ... but it does indicate that the neutral and ground are at (approximately) the same potential, and that said potential is greater than about 65V away from the "hot." Unless the ground and neutral are connected together at the receptacle or upstream (but before the breaker box, where they _should_ be), that _does_ say something about the presence of a ground. For that failure - one possible reason for the problem - you must visually inspect then entire connection from breaker box to earth ground. snip One would, of course, hope that an inspector had already done that before the circuit was energized, but humans are admittedly frail. IMHO, your best point was that multiple protective measures should be in place (the inspector being one I think you missed). -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . Hmm...sorry but I understood about 20% of the above post - got a bit too technical for me... I am the OP here is the original post: I got a good quality one to four video splitter so tonight I got up to the attic and disconnected the old splitter. Nothing unusual. Then I connect the new cable IN, then one by one I connect the cable OUT. When I get to the last one I felt a strong tinkling on my finger, you know when you rub your shoe on the carpet a few times and go touch a metal railing? Yes that feeling...I dropped the splitter. Is it static? No, it's not static. It's (hopefully current limited) leakage from your house electricity. STOP USING YOUR BODY AS A TESTER. Especially if you have a pacemaker. I don't know. So I touched the splitter, which at that time has the one IN cable and three OUT cables connected, and nothing, it's OK. Then I let go of the splitter and touch the last coax cable connector - nothing...so I touched the splitter with my left hand and the remaining cable connector with my right hand, yes I feel it again. What is going on? I then left the attic and when to the other end of that cable, which was at the time plugged into a VCR, which in turn was connected to the TV and they were running. I unplugged the connector on this end, went back to the attic and no more problem. So I hooked the last connector up. Then I came back down and put the cable connector back to the VCR. What caused this? Does this mean I have an electrical problem with that TV or VCR? Here are some additional tests I did afterwards: Well that does not compute either. Because I have the cable feed coming in from the outside and into the splitter. If I hold onto the outside cable and splitter, I do not feel this mild voltage spike. Now this splitter splits into four cables which connects to four TVs. Let's say we have cable A, B, C, D. I take cable A, and connect to splitter. Nothing, no voltage. Repeat for cable B, nothing. Repeat for cable C, nothing. Now I go grab the last cable, cable D, and I feel the voltage. I only feel it when I have outside cable + splitter in one hand and cable D in another. I let go of cable D, nothing. I let go of the splitter and only hold cable D, nothing either. Does this mean it might not be the outside cable grounding since cable A, B, C do not have this problem? Now I go to the other end of cable D which is connected to the VCR which then feeds to the TV. I disconnected that end. Go back to the attic. Touch both the splitter and cable D. Nothing. Then I went back down and connect cable D directly to the TV bypassing the VCR player, then back to the attic and try again, nothing. Then I wired it back to the VCR, repeat - yes I feel the voltage. Does this experiment conclude the problem is VCR player? MC MC -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . |
#30
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Coax cable carries electrical current? What is wrong?
On 29-Nov-2005, "miamicuse" wrote: I take cable A, and connect to splitter. Nothing, no voltage. Repeat for cable B, nothing. Repeat for cable C, nothing. Now I go grab the last cable, cable D, and I feel the voltage. I only feel it when I have outside cable + splitter in one hand and cable D in another. I let go of cable D, nothing. I let go of the splitter and only hold cable D, nothing either. Does this mean it might not be the outside cable grounding since cable A, B, C do not have this problem? The only way that you'll feel something is if your body is grounded. Since A, B and C don't have the problem, they might not be grounded - are they connected to something that is plugged in for power? Now I go to the other end of cable D which is connected to the VCR which then feeds to the TV. I disconnected that end. Go back to the attic. Touch both the splitter and cable D. Nothing. If D is connected to the VCR and it's plugged in, then D is grounded and you feel something. Then I went back down and connect cable D directly to the TV bypassing the VCR player, then back to the attic and try again, nothing. Is the TV plugged in? It sounds to me like your cable isn't grounded properly as it enters your house. As w_tom suggested - do a visual inspection of the cable entry point and check the ground is in place. Around here, the cable companies are required to run their line from the telephone pole/underground feed/ etc to a single box outside the house. This box is grounded. The line in the box is then split (optionally) and that (those) cable(s) are run into the house. If you have such a box, that's the point to start with. If nothing else, ground the splitter in the attic. Mike |
#31
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Coax cable carries electrical current? What is wrong?
It may be induced voltage from outside power lines or a powerful am
antenna transmitter. Anything like that close to you? |
#32
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Coax cable carries electrical current? What is wrong?
miamicuse wrote:
"Michael Daly" wrote in message ... On 28-Nov-2005, "miamicuse" wrote: If I unplug the cable to the VHS player but plug it into the TV directly, there is no current. No current where? - at the TV or out of the short coax coming out of the VCR? If the latter, it might be the current is coming in the cable from outside. Otherwise, you might have a problem inside your VCR. Well that does not compute either. Because I have the cable feed coming in from the outside and into the splitter. If I hold onto the outside cable and splitter, I do not feel this mild voltage spike. Now this splitter splits into four cables which connects to four TVs. Let's say we have cable A, B, C, D. I take cable A, and connect to splitter. Nothing, no voltage. Repeat for cable B, nothing. Repeat for cable C, nothing. Now I go grab the last cable, cable D, and I feel the voltage. I only feel it when I have outside cable + splitter in one hand and cable D in another. I let go of cable D, nothing. I let go of the splitter and only hold cable D, nothing either. Does this mean it might not be the outside cable grounding since cable A, B, C do not have this problem? Now I go to the other end of cable D which is connected to the VCR which then feeds to the TV. I disconnected that end. Go back to the attic. Touch both the splitter and cable D. Nothing. Then I went back down and connect cable D directly to the TV bypassing the VCR player, then back to the attic and try again, nothing. Then I wired it back to the VCR, repeat - yes I feel the voltage. Does this experiment conclude the problem is VCR player? It concludes that the VCR is either the source of the problem, or is actually tying the cable to ground and the tv is not. Have you disconnected all other cables leaving the VCR and still experience this? BTW, using yourself as a test device is a deathwish. Consider what voltages run 10-20 feet above the cable line on the poles. If one of those has been cut a few miles away and fallen on the cable line, you could be in serious danger. -- Respectfully, CL Gilbert "Verily, verily, I say unto you, He that entereth not by the door() into the sheepfold{}, but climbeth up some other *way, the same is a thief and a robber." GnuPG Key Fingerprint: 82A6 8893 C2A1 F64E A9AD 19AE 55B2 4CD7 80D2 0A2D |
#33
Posted to alt.home.repair
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Coax cable carries electrical current? What is wrong?
miamicuse wrote:
"CJT" wrote in message ... w_tom wrote: a few points ... (there may be others) snipThe best power strip is about $3+ dollars from Walmart, Lowes, or Home Depot; has the all so critical 15 amp circuit breaker (for human protectionsnip ... from fires, but which does nothing about electrocution). Don't make assumptions about that three light tester. It can detect failures BUT it cannot fully prove a receptacle is wired correctly. It can detect a wiring problem but cannot prove wiring as correct. What tester does report suggests receptacle polarity reversal is not a problem. It does not say, for example, that necessary safety ground from breaker box to earth is installed or exists. ... but it does indicate that the neutral and ground are at (approximately) the same potential, and that said potential is greater than about 65V away from the "hot." Unless the ground and neutral are connected together at the receptacle or upstream (but before the breaker box, where they _should_ be), that _does_ say something about the presence of a ground. For that failure - one possible reason for the problem - you must visually inspect then entire connection from breaker box to earth ground. snip One would, of course, hope that an inspector had already done that before the circuit was energized, but humans are admittedly frail. IMHO, your best point was that multiple protective measures should be in place (the inspector being one I think you missed). -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . Hmm...sorry but I understood about 20% of the above post - got a bit too technical for me... I am the OP here is the original post: I got a good quality one to four video splitter so tonight I got up to the attic and disconnected the old splitter. Nothing unusual. Then I connect the new cable IN, then one by one I connect the cable OUT. When I get to the last one I felt a strong tinkling on my finger, you know when you rub your shoe on the carpet a few times and go touch a metal railing? Yes that feeling...I dropped the splitter. Is it static? I don't know. So I touched the splitter, which at that time has the one IN cable and three OUT cables connected, and nothing, it's OK. Then I let go of the splitter and touch the last coax cable connector - nothing...so I touched the splitter with my left hand and the remaining cable connector with my right hand, yes I feel it again. What is going on? I then left the attic and when to the other end of that cable, which was at the time plugged into a VCR, which in turn was connected to the TV and they were running. I unplugged the connector on this end, went back to the attic and no more problem. So I hooked the last connector up. Then I came back down and put the cable connector back to the VCR. What caused this? Does this mean I have an electrical problem with that TV or VCR? Here are some additional tests I did afterwards: Well that does not compute either. Because I have the cable feed coming in from the outside and into the splitter. If I hold onto the outside cable and splitter, I do not feel this mild voltage spike. Now this splitter splits into four cables which connects to four TVs. Let's say we have cable A, B, C, D. I take cable A, and connect to splitter. Nothing, no voltage. Repeat for cable B, nothing. Repeat for cable C, nothing. Now I go grab the last cable, cable D, and I feel the voltage. I only feel it when I have outside cable + splitter in one hand and cable D in another. I let go of cable D, nothing. I let go of the splitter and only hold cable D, nothing either. Does this mean it might not be the outside cable grounding since cable A, B, C do not have this problem? Now I go to the other end of cable D which is connected to the VCR which then feeds to the TV. I disconnected that end. Go back to the attic. Touch both the splitter and cable D. Nothing. Then I went back down and connect cable D directly to the TV bypassing the VCR player, then back to the attic and try again, nothing. Then I wired it back to the VCR, repeat - yes I feel the voltage. Does this experiment conclude the problem is VCR player? MC Well typically the 'outside' cable is the only one tied to ground. That being the case, it does suggest some voltage created by the VCR could be going to the outside ground through you. If you feel it, its pretty high voltage. Try the same experiment but unplug the VCR from the 120VAC. And try using a circuit tester so as not to kill yourself. -- Respectfully, CL Gilbert "Verily, verily, I say unto you, He that entereth not by the door() into the sheepfold{}, but climbeth up some other *way, the same is a thief and a robber." GnuPG Key Fingerprint: 82A6 8893 C2A1 F64E A9AD 19AE 55B2 4CD7 80D2 0A2D |
#34
Posted to alt.home.repair
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Coax cable carries electrical current? What is wrong?
How do I find a source of ground? Do I just attach a bare wire to any
metallic conduits? Most of the piping in my attic are metal rigid conduits can I use them as ground? Thanks, MC "Glen" wrote in message nk.net... Good god man, just find a source of ground in your attic. Hold the splitter -- with the input connected and no outputs, touch the ground source and see if you feel anything. If so, your incoming cable isn't grounded properly (common problem). Simply attach the splitter to the source of ground and you're done. "miamicuse" wrote in message ... "CJT" wrote in message ... w_tom wrote: a few points ... (there may be others) snipThe best power strip is about $3+ dollars from Walmart, Lowes, or Home Depot; has the all so critical 15 amp circuit breaker (for human protectionsnip ... from fires, but which does nothing about electrocution). Don't make assumptions about that three light tester. It can detect failures BUT it cannot fully prove a receptacle is wired correctly. It can detect a wiring problem but cannot prove wiring as correct. What tester does report suggests receptacle polarity reversal is not a problem. It does not say, for example, that necessary safety ground from breaker box to earth is installed or exists. ... but it does indicate that the neutral and ground are at (approximately) the same potential, and that said potential is greater than about 65V away from the "hot." Unless the ground and neutral are connected together at the receptacle or upstream (but before the breaker box, where they _should_ be), that _does_ say something about the presence of a ground. For that failure - one possible reason for the problem - you must visually inspect then entire connection from breaker box to earth ground. snip One would, of course, hope that an inspector had already done that before the circuit was energized, but humans are admittedly frail. IMHO, your best point was that multiple protective measures should be in place (the inspector being one I think you missed). -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . Hmm...sorry but I understood about 20% of the above post - got a bit too technical for me... I am the OP here is the original post: I got a good quality one to four video splitter so tonight I got up to the attic and disconnected the old splitter. Nothing unusual. Then I connect the new cable IN, then one by one I connect the cable OUT. When I get to the last one I felt a strong tinkling on my finger, you know when you rub your shoe on the carpet a few times and go touch a metal railing? Yes that feeling...I dropped the splitter. Is it static? I don't know. So I touched the splitter, which at that time has the one IN cable and three OUT cables connected, and nothing, it's OK. Then I let go of the splitter and touch the last coax cable connector - nothing...so I touched the splitter with my left hand and the remaining cable connector with my right hand, yes I feel it again. What is going on? I then left the attic and when to the other end of that cable, which was at the time plugged into a VCR, which in turn was connected to the TV and they were running. I unplugged the connector on this end, went back to the attic and no more problem. So I hooked the last connector up. Then I came back down and put the cable connector back to the VCR. What caused this? Does this mean I have an electrical problem with that TV or VCR? Here are some additional tests I did afterwards: Well that does not compute either. Because I have the cable feed coming in from the outside and into the splitter. If I hold onto the outside cable and splitter, I do not feel this mild voltage spike. Now this splitter splits into four cables which connects to four TVs. Let's say we have cable A, B, C, D. I take cable A, and connect to splitter. Nothing, no voltage. Repeat for cable B, nothing. Repeat for cable C, nothing. Now I go grab the last cable, cable D, and I feel the voltage. I only feel it when I have outside cable + splitter in one hand and cable D in another. I let go of cable D, nothing. I let go of the splitter and only hold cable D, nothing either. Does this mean it might not be the outside cable grounding since cable A, B, C do not have this problem? Now I go to the other end of cable D which is connected to the VCR which then feeds to the TV. I disconnected that end. Go back to the attic. Touch both the splitter and cable D. Nothing. Then I went back down and connect cable D directly to the TV bypassing the VCR player, then back to the attic and try again, nothing. Then I wired it back to the VCR, repeat - yes I feel the voltage. Does this experiment conclude the problem is VCR player? MC MC |
#35
Posted to alt.home.repair
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Coax cable carries electrical current? What is wrong?
"CL (dnoyeB) Gilbert" wrote in message
... miamicuse wrote: "CJT" wrote in message ... w_tom wrote: a few points ... (there may be others) snipThe best power strip is about $3+ dollars from Walmart, Lowes, or Home Depot; has the all so critical 15 amp circuit breaker (for human protectionsnip ... from fires, but which does nothing about electrocution). Don't make assumptions about that three light tester. It can detect failures BUT it cannot fully prove a receptacle is wired correctly. It can detect a wiring problem but cannot prove wiring as correct. What tester does report suggests receptacle polarity reversal is not a problem. It does not say, for example, that necessary safety ground from breaker box to earth is installed or exists. ... but it does indicate that the neutral and ground are at (approximately) the same potential, and that said potential is greater than about 65V away from the "hot." Unless the ground and neutral are connected together at the receptacle or upstream (but before the breaker box, where they _should_ be), that _does_ say something about the presence of a ground. For that failure - one possible reason for the problem - you must visually inspect then entire connection from breaker box to earth ground. snip One would, of course, hope that an inspector had already done that before the circuit was energized, but humans are admittedly frail. IMHO, your best point was that multiple protective measures should be in place (the inspector being one I think you missed). -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . Hmm...sorry but I understood about 20% of the above post - got a bit too technical for me... I am the OP here is the original post: I got a good quality one to four video splitter so tonight I got up to the attic and disconnected the old splitter. Nothing unusual. Then I connect the new cable IN, then one by one I connect the cable OUT. When I get to the last one I felt a strong tinkling on my finger, you know when you rub your shoe on the carpet a few times and go touch a metal railing? Yes that feeling...I dropped the splitter. Is it static? I don't know. So I touched the splitter, which at that time has the one IN cable and three OUT cables connected, and nothing, it's OK. Then I let go of the splitter and touch the last coax cable connector - nothing...so I touched the splitter with my left hand and the remaining cable connector with my right hand, yes I feel it again. What is going on? I then left the attic and when to the other end of that cable, which was at the time plugged into a VCR, which in turn was connected to the TV and they were running. I unplugged the connector on this end, went back to the attic and no more problem. So I hooked the last connector up. Then I came back down and put the cable connector back to the VCR. What caused this? Does this mean I have an electrical problem with that TV or VCR? Here are some additional tests I did afterwards: Well that does not compute either. Because I have the cable feed coming in from the outside and into the splitter. If I hold onto the outside cable and splitter, I do not feel this mild voltage spike. Now this splitter splits into four cables which connects to four TVs. Let's say we have cable A, B, C, D. I take cable A, and connect to splitter. Nothing, no voltage. Repeat for cable B, nothing. Repeat for cable C, nothing. Now I go grab the last cable, cable D, and I feel the voltage. I only feel it when I have outside cable + splitter in one hand and cable D in another. I let go of cable D, nothing. I let go of the splitter and only hold cable D, nothing either. Does this mean it might not be the outside cable grounding since cable A, B, C do not have this problem? Now I go to the other end of cable D which is connected to the VCR which then feeds to the TV. I disconnected that end. Go back to the attic. Touch both the splitter and cable D. Nothing. Then I went back down and connect cable D directly to the TV bypassing the VCR player, then back to the attic and try again, nothing. Then I wired it back to the VCR, repeat - yes I feel the voltage. Does this experiment conclude the problem is VCR player? MC Well typically the 'outside' cable is the only one tied to ground. That being the case, it does suggest some voltage created by the VCR could be going to the outside ground through you. If you feel it, its pretty high voltage. Try the same experiment but unplug the VCR from the 120VAC. And try using a circuit tester so as not to kill yourself. -- Respectfully, CL Gilbert "Verily, verily, I say unto you, He that entereth not by the door() into the sheepfold{}, but climbeth up some other *way, the same is a thief and a robber." GnuPG Key Fingerprint: 82A6 8893 C2A1 F64E A9AD 19AE 55B2 4CD7 80D2 0A2D I have one of the pen style tester - when you jam it into an outlet it will beep? When I hold it to within 4 inches of the coax cable it beeps. I don't have any other circult tester. MC |
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