Bonded Neutral Generator..... - Electrical - Contractor Talk

Bonded Neutral Generator.....

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Unread 07-14-2020, 01:09 PM   #1
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Bonded Neutral Generator.....


I don't like these, but sometimes a customer will pick a cheap genny, that doesn't have a floating neutral.

It's my understanding that if the neutral is bonded at the generator, the transfer equipment will have to be installed as a Separately Derived System.

Because if not, then you will have 2 points where the neutral is bonded, once in the Main, and once in the generator, which, in my opinion, is a no-no.

Which means you can't use an interlock device for Bonded Neutral generators, you need to use a 3-pole double-throw transfer switch to break the neutral.


What say you???
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Unread Yesterday, 06:33 PM   #2
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Re: Bonded Neutral Generator.....


You are absolutely correct about the 3 pole transfer switch for bonded generators. They make bonded neutral portable generators, not necessarily as "cheap gennys", but for standalone use on a construction site or camp site, etc. Many of them have instructions in the manual, or a manufacturer-approved method of disconnecting the neutral bond to float the neutral instead. I just did one that took less than 5 min to float the neutral. Verify by taking continuity reading from ground to neutral in one of the receptacles with a multimeter while generator is off.

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