Sizing the telecommunications bonding backbone (TBB)
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Sizing the telecommunications bonding backbone (TBB)Expand / Collapse
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Posted Friday, June 02, 2017 3:26 PM
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As per TIA-607-B Generic Telecommunications Bonding and Grounding (Earthing) for Customer Premises - tia-607-b, Table 1 - TBB conductor size versus length, the largest conductor size is 750 MCM. Can anyone please shed some light in terms of why so large? Typically the largest I've seen is #3/0. Any help/explanation would be greatly appreciated.
Post #10604
Posted Tuesday, June 27, 2017 11:33 PM
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The sizes (AWG) quoted in the BICSI manual are suggested, not mandatory. I personally don't see a need for anything bigger than a #6. And, if the design of the rooms is done properly, you probably won't have many situations where you need much more than 50 -100 feet.
Post #10623
Posted Friday, June 30, 2017 5:02 PM
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Thanks for the feedback John.
Post #10625
Posted Wednesday, July 19, 2017 1:34 PM
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Voltage drop.

The current TIA 607-C standard allows building steel to be used instead of a TBB, provided that the building steel is properly bonded to the electrical grounding system. If building steel isn't available, the BICSI TDMM guideline says you can bond your TGBs to the ground bus of the serving electrical panelboard.
Post #10639
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