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Re: [RFI] RFI Digest, Vol 45, Issue 3

To: rfi@contesting.com
Subject: Re: [RFI] RFI Digest, Vol 45, Issue 3
From: Tim Groat <tcgroat@mesanetworks.net>
Date: Mon, 18 Sep 2006 22:35:33 -0600
List-post: <mailto:rfi@contesting.com>
>OTOH, I've read suggestions by licensed electricians and electrical
>inspectors suggesting that all these Hondas should be red-tagged because
>they are not and cannot be properly grounded in accordance with the NEC.

Proper generator grounding depends upon what application the generator is 
being used for. Grounding methods required for one application are be 
expressly forbidden in others. Grounding requirements are in article 250 of 
the NEC, a complex section even for professionals. If you're planning to 
connect any generator to permanent wiring, have the plans reviewed by a PE 
competent in electrical wiring, the local "Authority Having Jurisdiction", 
or a licensed Master Electrician. Don't rely on any advice you get over the 
internet, including mine!

That said, there are at least four ways the generator could be applied in 
an NEC-compliant system: as a "Separately Derived Source"(*), as a standby 
power or co-generation system that isn't separately derived, as a portable 
generator with plug-connected loads, or as a vehicle-mounted generator with 
[lug-connected and vehicle-mounted loads. Needless to say, different 
grounding requirements apply to each. There is no one "right" answer to 
generator grounding.

(*) The phrase "Separately Derived Source" has a specific definition in the 
Code. If the construction and installation don't meet all the requirements 
of that definition, it isn't separately derived and must not be treated as 
such. Confusion about whether a system is (or should be) Separately Derived 
often leads to incorrect grounding of generator and UPS systems.

--Tim (KR0U)

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