Sizing the TBB per TIA-607
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Sizing the TBB per TIA-607Expand / Collapse
Posted Thursday, January 14, 2016 6:42 PM
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Prior to TIA-607-B, the TBB was sized 2 kcmil/ft to a maximum of 3/0. For TIA-607-B and C, the TBB is still sized 2 kcmil/ft, but now the max size is 750 kcmil. Can anyone tell me what the justification for this is (what led to this change)? At 85 ft we've already exceeded 3/0, so it doesn't take much to make for an expensive cable in comparison to the 3/0.
Post #10128
Posted Monday, January 25, 2016 6:03 AM
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TBB sizing language always says "should consider" the larger conductor sizes.
Plus, there are so many ways you can eliminate the TBB altogether

john adams
Post #10134
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