Generator Gronunding

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sparky124

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I have a generator which is capable of 480/277 3P and 120/240 1P . Neutrals are bonded to generator frame.
Q. Pump station is fed 480 Delta 3wire no ground from utility. Ground rod at serice equipment ground run to station disconnect/transfer switch.
Since there is no return to the utility transformer. I believe a ground rod should be driven at the trailer mounted generator. The generator has a 4 wire 3 phase cord supplying the pump station .
The second pump station is a 4 wire 277/480 wye system neutral is unbroken in the transfer switch.
Here I believe a rod is not required at the trailer.
The generator rep. has instructed a ground rod be driven in all cases. I believe in some cases he is greating a parralel ground path.
 
Re: Generator Gronunding

I can't visualize your installation well enough to draw a sketch of it, but, in general -

* If the generator neutral is bonded to the frame, the transfer switch should interrupt the neutral connection, where one exists.

* When the neutral is switched, the generator is configured as a Separately Derived System (SDS).

* The neutral conductor of an SDS is required to be connected to an acceptable grounding electrode.

Ed


Gen9.gif
 
Re: Generator Gronunding

Sparky124,

I agree,on pump station 2 ,no neutral bond to gen, EGC only, solidly connected neutral is already connected to earth.

frank
 
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