EGC Question

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Steve-Ty

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Electrical Engineer/Electrician
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?
 
Look at Table 250.122 for 400 amps.

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After you check 250.122 ... what size are the phase conductors ?
 
Steve-Ty said:
As per 250.122, size of an equipment grounding conductor for a 400 amp circuit is #1 Aluminum.
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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.
 
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augie47 said:
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.
Click to expand...
Steve-Ty said:
As per 250.122, size of an equipment grounding conductor for a 400 amp circuit is #1 Aluminum.
Click to expand...
Steve, you want to ask him why.
Steve-Ty said:
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?
Click to expand...
 
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