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Joined: Jul 2004
Posts: 787
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Chicken and the egg. Does the cable contractor and Telco contractor determine where the IBT is, or does the electrician determine where it is? Is there a maximum distance between the IBT and the other systems? Can I have multiple IBTs? Just stirring the pot.
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Joined: Apr 2002
Posts: 7,381 Likes: 7
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George: I agree with Greg.
That said, consideration as to where the telco/cable/etc demarcs are has to be addressed. An IBT could/should be located at the MH bonded to the GE system, or at a pedestal IF that is the demarc points for the cable/telco/etc.
Is not the purpose and intent of the IBT to 'provide' a point of connection to the grounding system? IMHO, it should be at the demarc location.
John
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Joined: Apr 2002
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Larry:
The IBT location is determined by the EC. It is in the vicinity of electrical meter, or service point.
In 'rehab' (service upgrade) the battle on occasion is 'who connects the telco/cable/etc grounds/bonds to the IBT'??
That was a battle in the begining, now most ECs will make the termination. It's basically "Good Luck" trying to get any of the LV guys to do it on rehab work.
John
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Joined: Jul 2004
Posts: 9,923 Likes: 32
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Satellite may be the tough one. Those guys site the dish depending on where the bird is. Then they drive a 3' rod and connect it with 10ga wire. When I pointed out that it was required to connect this to the IBT the installer (trunk slammer) cocked his head like a puppy and said "we don't do that".
(actually more like "no lo hacemos")
Greg Fretwell
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Joined: Jan 2005
Posts: 5,445 Likes: 2
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I suppose we could get all excited, and fill pages with learned discourse, but I have to ask: Are we accomplishing anything? I mean, what happens if there's no connection between the low voltage stuff and the grounding electrode?
The worst I can see is that the LV stuff gets toasted when lightning strikes. Oh, well ... after a few such losses, the LV guys might actually learn the value of the connection.
Or, will they? With decades of experience behind us, if the ground connection accomplished anything you would think that they already knew it.
You can't push a rope. Maybe this IBT thing needs to go the way of the Volkstead act: away!
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Joined: Jul 2004
Posts: 9,923 Likes: 32
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The short answer is they never learn because it is usually the customer's equipment that gets blown up. They pass the cost on to their insurance company and we all pay.
The thought is, if we provide a common grounding terminal the customer might put pressure on the provider to use it if we explain why it is there.
In my case, I let the installer do what he was going to do, then I fixed it.
Greg Fretwell
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Posts: 28
Joined: May 2007
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