Sizing of Telecommunication
Bonding Backbone (TBB)
TBB length FT
Grounding
Conductor
Size (AWG)
DC
Resistance
Per 100 Ft
(Copper
Conductor)
ShortTime
Rating
(A)
8 0.0778 391
< 13 Ft 6 0.0491 621
14 - 20 Ft 4 0.0308 988
21 -26 Ft 3 0.0245 1245
27 - 33 Ft 2 0.194 1571
34 - 41 Ft 1 0.0154 1981
42 - 52 Ft 1/O 0.0122 2499
53 - 66 Ft 2/O 0.00967 3150
> 66 FT 3/O 0.00766 3972
4/O 0.00608 5008
Kcmil
250 0.00515 5917
300 0.00429 7101
350 0.00367 8284
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