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Date Posted: 14:07 09/29/09 Tue
Author: Mike Malone (Phil DiCesare UPS Grounding)
Subject: Re: UPS grounding
In reply to: Phil DiCesare 's message, "UPS grounding" on 09:54 09/18/09 Fri

>According to an equipment manual for our Liebert
>Uninterrupted Power Supplies for our IT and telecom
>systems they require an extra grounding conductor
>attched to the frame of the units (8AWG). They quote
>articles, 250-5d, 250-81, 250-83, and table 250-94. I
>don't see anywhere in these section (some which don't
>exist) the requirement. Has anyone heard of this
>requirement?
From Code Section 250.5(d)Seperately Derived Systems. This Section from the 1996 NEC was updated with a New Code Section in the 1999 NEC 250-30. With Uninterruptal Power Supplies, this would be a common practice in Grounding of Frame as well as the Supply Side or Seperately...

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