IBT Bonding Wire

[Doc13067]

250.59 states a #6 copper wire or larger is necessary for the IBT. What do you do if your GEC is #8 copper? Run a separate #6 for. The IBT? or is there an exception somewhere I didn’t see?

 

[tom baker]

No exception.
It’s very uncommon to see a 8 AWG GEC, as it needs to be in a conduit for protection.
What type of occupancy is this?

 

[infinity]

If the IBT is connected directly to the GEC I don't see why you need a #6 conductor.

 

[kwired]

No exception.
It’s very uncommon to see a 8 AWG GEC, as it needs to be in a conduit for protection.
What type of occupancy is this?

conduit on the GEC is no problem for the IBT

 

[tom baker]

The question was if the GEC is a #8, can you connect to it with a #6?

 

[infinity]

The question was if the GEC is a #8, can you connect to it with a #6?

If this using a wire jumper than #6 is required. If you're connecting the IBT directly to the GEC than you won't need a #6 or any other size jumper for that matter.

 

[Doc13067]

No exception.
It’s very uncommon to see a 8 AWG GEC, as it needs to be in a conduit for protection.
What type of occupancy is this?

Nothing specific I’m just brushing up on my education. Always residential for me though. In the Philadelphia area I see #8 GEC for 100 amp services all the time and never in conduit. Where is this rule about the conduit?

 

[rc/retired]

Nothing specific I’m just brushing up on my education. Always residential for me though. In the Philadelphia area I see #8 GEC for 100 amp services all the time and never in conduit. Where is this rule about the conduit?

250.64(B)(3)

Ron

 

[Doc13067]

250.64(B)(3)

Ron

Wow thank you. I’ve passed many inspections with #8 thhn as my GEC but I won’t risk it again.

 

[Doc13067]

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