New wire for ungrounded arrays [RE-wrenches]

Bill Brooks billb at endecon.com
Fri Jan 2 02:19:44 PST 2004


 

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Allan,

I've never seen MC cable used in PV systems--not that it can't be used for
module-to-module wiring--but it would need to be grounded. Yes, if it was
used in a future ungrounded system, it would have to be multiconductor. I
think MC is actually a good idea if the module manufacturers would supply a
jumper to carry the conduit ground through the junction box.

Bill.



-----Original Message-----
From: Allan Sindelar [mailto:allan at positiveenergysolar.com] 
Sent: Wednesday, December 15, 2004 6:10 PM
To: RE-wrenches at topica.com
Subject: Re: New wire for ungrounded arrays [RE-wrenches]

We typically use single-conductor MC cable. Does this new provision mean
that only sheathed two-conductor MC cable is permitted? Allan

----- Original Message ----- 
From: "Bill Brooks" <billb at endecon.com>
William,
Here is the language from the 2005 NEC:
690.35(D) The photovoltaic source and output conductors shall consist of
sheathed (jacketed) multi-conductor cables or shall be installed in a
raceway.

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