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sahababu71
Active Contributor

Join Date: Feb 2011
Posts: 13

Neutral Grounding of Standby Generator

06/22/2014 12:15 AM

If station service transformer (SST-240/120v-y/y solidly grounded) from utility and standby generator are in same substation ground grid then is it required to ground neutral at 1st disconnect means panel of SST?As per NEC code it shall be but most of case when neutral coming from outside not in same grid. It's separately derived system with manual transfer switch. Comments and advise are appreciated.
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lyn
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Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#1

Re: Neutral grounding of stand by generator

06/22/2014 12:29 AM

Comment: You shouldn't have to ask.

Advice: Get professional help.
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TonyS
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United Kingdom - Member - New Member

Join Date: Aug 2010
Location: Resting under the Major Oak
Posts: 4347
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#2

Re: Neutral grounding of stand by generator

06/22/2014 7:26 AM

This is getting monotonous, you asked the same question yesterday.

Didn't you like the answers?

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cuba_pete
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Join Date: Dec 2010
Posts: 1895
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#3

Re: Neutral Grounding of Standby Generator

06/22/2014 10:07 PM

"Neutral coming from outside"

Here lies the crux of your question.

See response number one.
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M.R.Iyengar
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Join Date: Jan 2014
Location: Korba, Chattisgarh, India 495450
Posts: 64
Good Answers: 2
#4

Re: Neutral Grounding of Standby Generator

06/23/2014 12:18 AM

it is always wise to use four opole breakers, which circumvents earthing clash uissues. better keep earths isolated - to avoid fault imaging into another circuit.

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cuba_pete
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Join Date: Dec 2010
Posts: 1895
Good Answers: 44
#5
In reply to #4

Re: Neutral Grounding of Standby Generator

06/23/2014 12:53 AM

Yeah, what he said...fault imaging...a classic issue.
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