Parallel Feeder sizes and accompanying EGCs

[Solar Guy]

Got a question on parallel feeder sets. Say I have a 400A 3-phase 4-wire circuit, so according to Table 250-122 the EGC is #3. But I can run that circuit with a single run of 600kcmil and the #3, or two runs of #3/0 and two EGCs. Can I also downsize the EGC from #3 (52.6kcmil) to half its size, or two #6 (26.3kcmil)?

 

[winnie]

Nope, the EGC must always be full size.

Jon

 

[infinity]

As Jon stated your parallel runs will each require a full size EGC based T250.122 and on the OCPD ahead of the feeder.

 

[tom baker]

And the full size is required as a fault in the middle an be fed from both ends

 

[petersonra]

Got a question on parallel feeder sets. Say I have a 400A 3-phase 4-wire circuit, so according to Table 250-122 the EGC is #3. But I can run that circuit with a single run of 600kcmil and the #3, or two runs of #3/0 and two EGCs. Can I also downsize the EGC from #3 (52.6kcmil) to half its size, or two #6 (26.3kcmil)?

if you run it in a metallic raceway you can skip the wire type EGC altogether.

But, if you chose to run an EGC, it has to be full size.