Generator Neutral in Separate Conduit

[wirestu]

Came across an interesting installation at a site. There is a 600 kVA generator that feeds an electrically operated manual transfer switch. The service is 480/277Y 3 phase 4 wire. The switchboard has all 3 phase 3 wire loads. The MTS is a 3 pole switch. The phase conductors from the generator to the MTS were run in a 5" conduit. (3 sets of 500 MCM per phase). The ground was run in the 5" conduit. The neutrals (I believe a 3-3/0) were run in a separate conduit. The neutrals connect to the service neutrals but don't go any further. My question is even though the neutrals are not required, by installing them, must they be in the same conduit as the phase conductors. Thanks for the replies. Quote code sections if they apply.

Thanks,

Stu

 

[brian john]

Re: Generator Neutral in Separate Conduit

If you want a NEC compliant installation. Depending where in the system you are grounded you may be able to eliminate the neutrals.

 

[hornetd]

Re: Generator Neutral in Separate Conduit

You are correct that the neutrals should have been run in the same conduits as the phase conductors. If the generator is wye connected than the neutral conductors are required but what you are calling a ground may be the neutral conductor.
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Tom Horne

[ May 19, 2004, 04:02 PM: Message edited by: hornetd ]