EGC Question

[Steve-Ty]

A FEEDER CONTAINS SIX ALUMINUM CONDUCTORS INSTALLED IN A PVC CONDUIT. TWO CONDUCTORS PER PHASE ARE PROTECTED BY A 400 AMP FUSE. WHAT SIZE ALUMINUM EQUIPMENT GROUNDING CONDUCTOR IS REQUIRED?

 

[infinity]

Look at Table 250.122 for 400 amps.

Welcome to the Forum and please turn off the Caps lock.

 

[augie47]

After you check 250.122 ... what size are the phase conductors ?

 

[Steve-Ty]

Look at Table 250.122 for 400 amps.

Welcome to the Forum and please turn off the Caps lock.

Thank you! Will do!

 

[Steve-Ty]

After you check 250.122 ... what size are the phase conductors ?

As per 250.122, size of an equipment grounding conductor for a 400 amp circuit is #1 Aluminum.

 

[augie47]

As per 250.122, size of an equipment grounding conductor for a 400 amp circuit is #1 Aluminum.

But the size of your phase conductors (unknown) may affect that.
250.122(B) might require an larger EGC if you phase conductors are oversized.

 

[Tulsa Electrician]

But the size of your phase conductors (unknown) may affect that.
250.122(B) might require an larger EGC if you phase conductors are oversized.

As per 250.122, size of an equipment grounding conductor for a 400 amp circuit is #1 Aluminum.

Steve, you want to ask him why.

A FEEDER CONTAINS SIX ALUMINUM CONDUCTORS INSTALLED IN (A) PVC CONDUIT. TWO CONDUCTORS PER PHASE ARE PROTECTED BY A 400 AMP FUSE. WHAT SIZE ALUMINUM EQUIPMENT GROUNDING CONDUCTOR IS REQUIRED?

 

[infinity]

As per 250.122, size of an equipment grounding conductor for a 400 amp circuit is #1 Aluminum.

That's correct assuming that the conductors are sized for 400 amps and not up sized for some other reason.