Parallel Cable Run

[Alley Cat Bad Dog]

Hi there,
I want to confirm one thing I made with the project I'm working on, So I have a large Panel (480/277V - 600A MCB) that I'm feeding from a switch board, and I'm wiring it with this configuration:

2* (4-1/C 350 KCMIL PH)
2* (1 AWG GND) XHHW-2, CU
2* (3" RGS CONDUIT)

Am I doing it right? also do we need 2 neutral and 2 ground wires for this parallel cable run? or one of each would be enough. Please let me know what you think, Thanks!

 

[augie47]

Each conduit must contain all phases, grounded and, if used, equipment grounding conductors,
Parallel conductors must not be smaller than 1/0

 

[ggunn]

Each conduit must contain all phases, grounded and, if used, equipment grounding conductors,
Parallel conductors must not be smaller than 1/0

And if EGC is used, a full sized one for the circuit OCPD needs to be in every conduit.

 

[don_resqcapt19]

And if EGC is used, a full sized one for the circuit OCPD needs to be in every conduit.

The OP shows the EGC as 1 AWG copper in each raceway, so the correct size for a feeder protected by a 600 amp OCPD.

 

[JoeStillman]

Each conduit must contain all phases, grounded and, if used, equipment grounding conductors,
Parallel conductors must not be smaller than 1/0

310.10(G)(1) does not include the EGC in its list of paralleled conductors that must be 1/0 or larger.

 

[ggunn]

310.10(G)(1) does not include the EGC in its list of paralleled conductors that must be 1/0 or larger.

And of course there's no reason for it to be in there.

 

[augie47]

My comment on the parallel was simply to point out that Code Section and did not mean to indicate EGC. Poor wording on my part,