Its a legitimate point, but nothing is "official". Insulated is fine,
but don't use THHN, it will deteriorate quickly in the UV outdoors. I
believe USE-2 is available in colors besides black now. You might be
able to color tape USE-2, also. 690.4(B) allows marking tape on smaller
conductors, but specifies PV system conductors, so I'm not sure if that
could be applied to the EGC. Hmmmm.....
You might also be able to use pieces of heat shrink on bare Cu just
where it crosses other metals.
This is yet another reason why WEEBs are a god send.
Ray Walters
On 10/31/2011 9:46 AM, James Rudolph wrote:
Dearest Wrenches,
I was wondering what the "official" postion was with EGCs being ran
where they came in contact with racking. Is it standard practice to
use a bare or a insulated ECG? I do recall having some AHJs in Marin,
CA mandating the use of an insulated ground wire, due to the fact
that it came into contact with dissimilar metals (anodized AL rail and
galvanized B-line strut) on the roof. One approach was to use weeb
grounding clips at each module to limit the need and length of the EGC
etc. I was just hoping to hear how everybody was dealing with this
issue.
Thanks in advance,
*James B Rudolph
NABCEP Certified PV Installer
Licensed Master Electrician
*
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