Grounded for two weeks...hopefully longer [RE-wrenches]

[Bill Brooks]

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Brad,

I think your assessment is correct, and it is my general recommendation to
inspectors who ask. However, exposure to physical damage is in the eyes of
the beholder and is not well defined in the code.

Bill.

-----Original Message-----
From: Brad Bassett [mailto:bsbassett at earthlink.net]
Sent: Monday, April 05, 2004 1:04 PM
To: RE-wrenches at topica.com
Subject: RE: Grounded for two weeks...hopefully longer [RE-wrenches]


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250.64 refers to the grounding electrode conductor, isn't this the
conductor from the main panel to the ground rod? If so, then it's
probably a good idea to follow 250.64, including 250.64(c) continuous
wire, I've always followed this.

But I beleive that the grounding of modules is an equipment grounding
conductor falling under 250.120, not 250.64, which only requires
protection from phyical damage, or the use of #6 Cu if exposed to
physical damage. I've always considered that an equipment grounding
conductor (and current carrying conductors also) that is attached to the
module or racking frames counts as being protected, and that conductors
running where they can be stepped on or tripped over such as larger gaps
between modules or racks (more than the 1" racking gap between modules)
should be in conduit or protected in some way.

Brad


mlafferty at universalenergies.com wrote:
>
> David H wrote:
>
> >  We just had one of our installers get tagged by a county inspector
> >  with a new one. He stated that the code says "all grounding
> >  conductors smaller than #4 shall be in conduit". Therefore he wants
> >  all the the #10 bare copper connecting the modules placed in conduit.
> >  Does anyone have a rebuttal for us?
>
> David / Wrenches:
>
> > 250.64(B) tells us that conductors smaller than 6 AWG have to be in
> > conduit.
> Caution - Don't even read 250.64(C) if you care to keep your lunch in
> your
> stomach!
>
> 250.120(C) supports the "#6 and smaller in conduit" and adds the
> "physical
> damage" clause.  This is your "out", but only if you can help the
> inspector
> see that "up here on the roof" isn't "subject to physical damage" under
> the
> "spirit of the Code principle".
>
>>



Brad Bassett
AEE


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