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#1
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Telco Ground Bonding
Group:
US Calif here. Do the wiring regs require that Cable and Telco services are bonded to the electricity ground. It seems that my telco has it's own ground (a wire disappears into the earth!), and the catv service is bonded to an electrical conduit (but not the the ground stake itself). Any advise for getting them changed to comply with wiring regs at no cost? Cheers Den |
#2
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Well, here in Illinois, they apparently want it all bonded to the
electrical ground. However, in my house, the cable is grounded to a ground rod in the earth. An August lightning storm really messed up things in my house. The best we can tell, the current came in through the ground, hit the cable abd Malibu lights. It took out the cable company's coupler on the pedestal. It took out my cable modem, router and computer. I think the ground potential on the cable and the ground potential on the electrical ground were very different (because they are ground to different places) and thus fried everything in between. So if you have lightning, it is probably important. If you are in southern CA were there is little lightning, it is probably not that important. Den wrote: Group: US Calif here. Do the wiring regs require that Cable and Telco services are bonded to the electricity ground. It seems that my telco has it's own ground (a wire disappears into the earth!), and the catv service is bonded to an electrical conduit (but not the the ground stake itself). Any advise for getting them changed to comply with wiring regs at no cost? Cheers Den |
#3
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Den wrote:
Group: US Calif here. Do the wiring regs require that Cable and Telco services are bonded to the electricity ground. Yes. Article 800 of the NEC (national electric code). It seems that my telco has it's own ground (a wire disappears into the earth!), and the catv service is bonded to an electrical conduit (but not the the ground stake itself). Any advise for getting them changed to comply with wiring regs at no cost? Cheers Den Good luck. The telco does whatever the hell it wants because they only answer to the Public Utility Commision, and they know the PUC doesn't care about residential grounding. The local electrical inspector also has some jurisdiction, but he won't want to get involved. Perhaps he has no real enforcement authority over the phone company? I went through all this a couple of months ago. I ended up grounding the NID myself, and I had to argue with the telco billing office for about 20 minutes when they tried to charge me for a service call when they sent someone out who just told me "I checked with my supervisor and we don't do that" and left. BTW, bonding to the metal *service conduit* is specifically allowed by the NEC and is about as good as bonding to the grounding electrode system, so your CATV is likely OK. Best regards, Bob |
#4
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On Wed, 13 Oct 2004 03:34:19 GMT, "Den" wrote:
US Calif here. Do the wiring regs require that Cable and Telco services are bonded to the electricity ground. It seems that my telco has it's own ground (a wire disappears into the earth!), and the catv service is bonded to an electrical conduit (but not the the ground stake itself). Any advise for getting them changed to comply with wiring regs at no cost? Call 'em and ask. The NEC now mandates bonding to the electrical service ground, but if your installation was before the change (1996?) then the change won't happen until the line is serviced for some reason. Locally, both cable and telco will do this anytime there needs to be work on the connection, even if it's a test for fuzzy picture/bad sound. Jeff |
#5
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The NEC now mandates bonding to the electrical
service ground, but if your installation was before the change (1996?) This is far from a new change. It has been in the code since 1975 for sure, 800.13(b)(5) (the oldest book I have) and it was not new then.. The language and location in the code may have moved around but the requirement that all grounding electrodes on a premisis be bonded together has been consistant |
#6
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#7
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zxcvbob wrote in message ...
Den wrote: Group: US Calif here. Do the wiring regs require that Cable and Telco services are bonded to the electricity ground. Yes. Article 800 of the NEC (national electric code). It seems that my telco has it's own ground (a wire disappears into the earth!), and the catv service is bonded to an electrical conduit (but not the the ground stake itself). Any advise for getting them changed to comply with wiring regs at no cost? Cheers Den Good luck. The telco does whatever the hell it wants because they only answer to the Public Utility Commision, and they know the PUC doesn't care about residential grounding. The local electrical inspector also has some jurisdiction, but he won't want to get involved. Perhaps he has no real enforcement authority over the phone company? I went through all this a couple of months ago. I ended up grounding the NID myself, and I had to argue with the telco billing office for about 20 minutes when they tried to charge me for a service call when they sent someone out who just told me "I checked with my supervisor and we don't do that" and left. BTW, bonding to the metal *service conduit* is specifically allowed by the NEC and is about as good as bonding to the grounding electrode system, so your CATV is likely OK. Best regards, Bob I had a similar experience. I have a 625ft run of D.E.B. telephone cable from their service box to my residence. I had several modems go bad during thunderstorms so I called them to check the grounding. The ground point was the service box and they would not drive a ground rod at the residence. Case closed from their viewpoint. I drove my own ground rod and connected it to their cable. Problem solved - no damage for the last 2 years now. Bob S. |
#8
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Bob S. wrote:
zxcvbob wrote in message ... Den wrote: Group: US Calif here. Do the wiring regs require that Cable and Telco services are bonded to the electricity ground. Yes. Article 800 of the NEC (national electric code). It seems that my telco has it's own ground (a wire disappears into the earth!), and the catv service is bonded to an electrical conduit (but not the the ground stake itself). Any advise for getting them changed to comply with wiring regs at no cost? Cheers Den Good luck. The telco does whatever the hell it wants because they only answer to the Public Utility Commision, and they know the PUC doesn't care about residential grounding. The local electrical inspector also has some jurisdiction, but he won't want to get involved. Perhaps he has no real enforcement authority over the phone company? I went through all this a couple of months ago. I ended up grounding the NID myself, and I had to argue with the telco billing office for about 20 minutes when they tried to charge me for a service call when they sent someone out who just told me "I checked with my supervisor and we don't do that" and left. BTW, bonding to the metal *service conduit* is specifically allowed by the NEC and is about as good as bonding to the grounding electrode system, so your CATV is likely OK. Best regards, Bob I had a similar experience. I have a 625ft run of D.E.B. telephone cable from their service box to my residence. I had several modems go bad during thunderstorms so I called them to check the grounding. The ground point was the service box and they would not drive a ground rod at the residence. Case closed from their viewpoint. I drove my own ground rod and connected it to their cable. Problem solved - no damage for the last 2 years now. Bob S. Hi, Here in Calgary, Alberta where I live all cables are underground and grounding is altogether to electrical ground. No separate grounding. Tony |
#9
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This is one of those cases where you can simply do it and stop worrying about
whether the telco/cableco is right or wrong. Buy a couple clamps and some 6 ga solid and bond them. You can just call it a cheap insurance premium. The utilities are certainly not going to pay you if your electronics all go up in smoke during a thunderstorm because of a ground shift between the electrodes. If you go back through the archives of the various electronics and home groups you will see lots of arguments about surge protection but one thing that is consistant between all of them is that you need a good single point grounding system. |
#10
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At the interconnection point between your house and the utility cable, there are surge protectors that must be grounded, otherwise they are useless against a high-voltage spike that comes in simultaneously on both wires. Quite true. I guess I didn't make my point clear enough. Also, any antenna grounding or lightning rod system is to be bonded to the power line ground. Ditto for "cable TV" (that's the one that often isn't grounded. Also, often the TV "dish" isn't bonding to the power ground. They all should be bonded together. |
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