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#1
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Grounding a telephone line.
When the phone company installed my outdoor phone connection box, they
installed a separate ground rod. But the one for my electric panel is 50 feet away. I'm running my own phone line from my house to another building at quite a distance. I intend to install another outdoor box with built in lightning protection. (same as the one from the phone company). The ground rod from my electric service is 6 feet away. Is there any reason not to use the same rod? It dont seem to make much sense to drive in another rod. Note: I intend to also ground a tv antenna to it. |
#3
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Grounding a telephone line.
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#4
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Grounding a telephone line.
On Wednesday, November 27, 2013 9:14:26 PM UTC-6, wrote:
When the phone company installed my outdoor phone connection box, they installed a separate ground rod. But the one for my electric panel is 50 feet away. I'm running my own phone line from my house to another building at quite a distance. I intend to install another outdoor box with built in lightning protection. (same as the one from the phone company). The ground rod from my electric service is 6 feet away. Is there any reason not to use the same rod? It dont seem to make much sense to drive in another rod. Note: I intend to also ground a tv antenna to it. Only thing that concerns me would be if there was a nearby lightning strike and the ground potential between the two ground locations differed by several hundres volts for the duration of the strike. I am not sure what would happen in terms of ground loop currents if the protectors broke down, but at different voltages. That would put both of the two telephone conductors (tip and ring) at widely different voltages at the two locations, and there would be a huge current flow between the two protectors through the telephone lines. I think it might be better to only ground at the first point of entrance, which is already grounded. |
#6
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Grounding a telephone line.
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#7
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Grounding a telephone line.
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#8
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Grounding a telephone line.
On Wed, 27 Nov 2013 23:46:37 -0500, wrote:
On Wed, 27 Nov 2013 21:14:26 -0600, wrote: When the phone company installed my outdoor phone connection box, they installed a separate ground rod. But the one for my electric panel is 50 feet away. I'm running my own phone line from my house to another building at quite a distance. I intend to install another outdoor box with built in lightning protection. (same as the one from the phone company). The ground rod from my electric service is 6 feet away. Is there any reason not to use the same rod? It dont seem to make much sense to drive in another rod. Note: I intend to also ground a tv antenna to it. The NEC requires that ALL ground electrodes must be bonded together. It is also the recommended practice for lightning protection. If line powered telephone equipment is the only place here this bond occurs (incidently) that will be where any difference is reconciled. Back in the modem days, separate grounding systems was the most common cause of smoking modems PCs etc The same is true of satellite installations. They usually drive a separate rod. You should bond this to your grounding electrode system for the service. In that case, I may as well just use the same ground rod. And since you mentioned the modems, as I said in my original post, the phone line ground rod is 50 ft from the power ground rod. Being rural, my only option for internet is a dialup modem, or spending a fortune on satellite dish internet, which will force me to have satellite tv, and I dont watch much tv. Every year I lose at least one modem from lightning, even if the lightning is miles away. I've partly solved that by unplugging the phone line from the modem when I'm offline. Maybe that separate ground is why???? Cuz my phone lines are still wire and underground. |
#9
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Grounding a telephone line.
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#10
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Grounding a telephone line.
On Thursday, November 28, 2013 3:56:46 AM UTC-5, wrote:
On Wed, 27 Nov 2013 23:46:37 -0500, wrote: On Wed, 27 Nov 2013 21:14:26 -0600, wrote: When the phone company installed my outdoor phone connection box, they installed a separate ground rod. But the one for my electric panel is 50 feet away. I'm running my own phone line from my house to another building at quite a distance. I intend to install another outdoor box with built in lightning protection. (same as the one from the phone company). The ground rod from my electric service is 6 feet away. Is there any reason not to use the same rod? It dont seem to make much sense to drive in another rod. Note: I intend to also ground a tv antenna to it. The NEC requires that ALL ground electrodes must be bonded together. It is also the recommended practice for lightning protection. If line powered telephone equipment is the only place here this bond occurs (incidently) that will be where any difference is reconciled. Back in the modem days, separate grounding systems was the most common cause of smoking modems PCs etc The same is true of satellite installations. They usually drive a separate rod. You should bond this to your grounding electrode system for the service. In that case, I may as well just use the same ground rod. That's how it's done in current code. An inter-system bonding termination block is installed by the panel. It's connected to the ground system for the panel and usually phone, cable, etc are brought in near there and tied to it. If they can't be brought in nearby, then they can be grounded elsewhere, but that ground is then still supposed to be bonded back to the main ground system for the building. And since you mentioned the modems, as I said in my original post, the phone line ground rod is 50 ft from the power ground rod. Being rural, my only option for internet is a dialup modem, or spending a fortune on satellite dish internet, which will force me to have satellite tv, and I dont watch much tv. Every year I lose at least one modem from lightning, even if the lightning is miles away. I've partly solved that by unplugging the phone line from the modem when I'm offline. Maybe that separate ground is why???? Cuz my phone lines are still wire and underground. Yes, if that's a seperate ground rod and not bonded to the building system, you could have a big potential difference with a lightning surge. |
#11
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Grounding a telephone line.
On 11/27/2013 10:46 PM, wrote:
On Wed, 27 Nov 2013 21:14:26 -0600, wrote: When the phone company installed my outdoor phone connection box, they installed a separate ground rod. But the one for my electric panel is 50 feet away. I'm running my own phone line from my house to another building at quite a distance. I intend to install another outdoor box with built in lightning protection. (same as the one from the phone company). The ground rod from my electric service is 6 feet away. Is there any reason not to use the same rod? It dont seem to make much sense to drive in another rod. Note: I intend to also ground a tv antenna to it. The NEC requires that ALL ground electrodes must be bonded together. It is also the recommended practice for lightning protection. If line powered telephone equipment is the only place here this bond occurs (incidently) that will be where any difference is reconciled. Back in the modem days, separate grounding systems was the most common cause of smoking modems PCs etc The same is true of satellite installations. They usually drive a separate rod. You should bond this to your grounding electrode system for the service. This is a major point for protecting equipment. You want a single earthing system with a single connection to the house, and short wires from entrance protectors to that earthing system. During an "event" the ground rod 50 ft away may be many thousands of volts different from the house. That voltage shows up at equipment connected to both phone and power. I would put a second phone entry protector at the house and connect it to the house earthing system. There is no direct connection from protectors to the phone wires so there should be no noise introduced. Bonding the rod 50 ft away doesn't work as well as you might think. You could have a relatively large current through the bond wire during an "event" since that ground rod is part of the earthing system. Lightning has relatively high frequency components, so the inductance of the wire is more important than the resistance. The inductance doesn't decrease very fast as you increase the wire size. |
#12
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Grounding a telephone line.
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#13
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Grounding a telephone line.
On Thursday, November 28, 2013 12:30:46 PM UTC-5, wrote:
On Thu, 28 Nov 2013 02:56:46 -0600, wrote: On Wed, 27 Nov 2013 23:46:37 -0500, wrote: On Wed, 27 Nov 2013 21:14:26 -0600, wrote: When the phone company installed my outdoor phone connection box, they installed a separate ground rod. But the one for my electric panel is 50 feet away. I'm running my own phone line from my house to another building at quite a distance. I intend to install another outdoor box with built in lightning protection. (same as the one from the phone company). The ground rod from my electric service is 6 feet away. Is there any reason not to use the same rod? It dont seem to make much sense to drive in another rod. Note: I intend to also ground a tv antenna to it. The NEC requires that ALL ground electrodes must be bonded together. It is also the recommended practice for lightning protection. If line powered telephone equipment is the only place here this bond occurs (incidently) that will be where any difference is reconciled. Back in the modem days, separate grounding systems was the most common cause of smoking modems PCs etc The same is true of satellite installations. They usually drive a separate rod. You should bond this to your grounding electrode system for the service. In that case, I may as well just use the same ground rod. And since you mentioned the modems, as I said in my original post, the phone line ground rod is 50 ft from the power ground rod. Being rural, my only option for internet is a dialup modem, or spending a fortune on satellite dish internet, which will force me to have satellite tv, and I dont watch much tv. Every year I lose at least one modem from lightning, even if the lightning is miles away. I've partly solved that by unplugging the phone line from the modem when I'm offline. Maybe that separate ground is why???? Cuz my phone lines are still wire and underground. Another important thing is a point of use protector at the PC that picks up the phone line and power, sinking them to a common point. That is in addition to a panel protector and the protection the phone company has.although phone protectors are usually pretty lousy. If it is a carbon element protector it is useless Any predicitions on how soon we'll be hearing from Tom? |
#14
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Grounding a telephone line.
On Thu, 28 Nov 2013 10:10:44 -0800 (PST), "
wrote: Any predicitions on how soon we'll be hearing from Tom? :-\ |
#15
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Grounding a telephone line.
On 11/27/2013 9:14 PM, wrote:
When the phone company installed my outdoor phone connection box, they installed a separate ground rod. But the one for my electric panel is 50 feet away. I'm running my own phone line from my house to another building at quite a distance. I intend to install another outdoor box with built in lightning protection. (same as the one from the phone company). The ground rod from my electric service is 6 feet away. Is there any reason not to use the same rod? It dont seem to make much sense to drive in another rod. Note: I intend to also ground a tv antenna to it. You don't ground the phone line, you ground the lightning protector. The protector technology has changed over the years but neither side of the phone lines is ever tied to ground. The wires are designated "Tip and Ring" with a standard color code of green for Tip and red for Ring. This comes from the old days when an operator actually made connections at a switchboard by manually plugging in a "phone plug" then flipping a switch to ring the phone at the other end. Tip is the tip of the phone plug and Ring is the ring around the shaft of the phone plug, much like the 1/4" plug on a big set of stereo headphones. Anyway, there is a separate surge arresting element connected from Tip and Ring to ground. The elements have changed over the years from a carbon resistor or spark gap to gas tube elements and now solid state elements that conduct whenever a voltage surge comes in over either side of the phone line pair. I know this stuff because I've had to argue with the phone company when my customer's phone line is dead and there is nothing wrong with the inside wiring of the building. Often lightning will burn out a switching module of the switch at the phone company's central office that serves that particular customer. I've had to add extra lightning protection at commercial customer's locations because lightning was damaging the multi line phone systems at their businesses. o_O A very good source of parts and information about all things telephone where I've purchased parts and systems: http://www.sandman.com/ http://preview.tinyurl.com/k48cp4b A lightning protector like what I picked up for a customer. This one has gas tube modules which are replaceable by plugging in a new one: http://preview.tinyurl.com/leo22nu The same base but equipped with delta modules which are a hybrid of gas tube and solid state elements. The modules are interchangeable: http://preview.tinyurl.com/l8pauwm TDD |
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