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Discussion Boards > Active Subjects > Messages as Posted > Generators Forum

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12-13-2014, 16:32

Post: 191625

dododo

Join Date: Aug 2005
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Portable Generator House Backup Grounding

I have pondered this myself as I find the documentation that came with genset confusing. According to my dealer if I am connecting the generator with a 30 amp 4 prong plug to a generator subpanel I do not have to ground the generator with a ground stake at the genset.

My research finds the following:

Generator Grounding
When are Ground Rods Required at Portable Generators?

Portable generators are often used for backup power at traffic signals, buildings, structures and special events. Ground rods (grounding electrodes) are only required if the generator is a separately derived system. (For the complete text of sections cited please see the 2002 NEC)

What is a Separately Derived System?
The NEC in Article 100 defines a Separately Derived System as:
Separately Derived System. A premises wiring system whose power is derived from a battery, from a solar photovoltaic system, or from a generator, transformer, or converter windings, and that has no direct electrical connection, including a solidly connected grounded circuit conductor, to supply conductors originating in another system. [See Fig 1]

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12-13-2014, 17:34

Post: 191626

dododo

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Portable Generator House Backup Grounding

This is a Separately derived System

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Generators: Portable-Generator-House-Backup-Grounding

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12-13-2014, 17:36

Post: 191627

dododo

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Portable Generator House Backup Grounding

Not Separately Derived System

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