romex in met-metered installations [RE-wrenches]

[Jeffery Wolfe, Global Resource Options]

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Kirk,

We've used this in a couple of applications. Given the current
interpretation of the code in regards to PV being a service entrance, I
would probably shy away from it. And it seems that when the NEC is
"clarified" in 2005, it would be a definite "no" up to the DC disconnect
inside.

That said, NM-B wiring can be an appropriate solution from runs from the
DC disconnect to the inverter, and the inverter to the PB. Whenever we
use it as DC conductor (which has not been too often) we do make sure
it's very well, and frequently, labeled.

Jeff Wolfe
Global Resource Options
 

-----Original Message-----
From: Kirk Herander [mailto:kirk at vtsolar.com] 
Sent: Tuesday, June 01, 2004 7:34 PM
To: RE-wrenches at topica.com; RE-wrenches at topica.com
Subject: romex in met-metered installations [RE-wrenches]

 

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Group,

I'm wondering about the merits of this. Can romex be used between
high-voltage DC arrays and the inverter?  NM-B is rated for 600v and 90
degrees c, according to NEC 334.112. I'm not talking outdoors of course,
but from an array junction box(use-2 from array to j-box) in the attic
down to the basement where the DC disconnect is located, then stranded
thhn to the inverter input. Even if it can be used, should it be used?
It just doesn't seem quite right. It cannot be used as service entrance
cable. This is a single-family residence I'm talking about.


Vermont Solar Engineering
Kirk Herander
North American Board of Certified Energy Practitioners Certified Solar
PV Installer(TM) Xantrex Certified Dealer Charter Member
NYSERDA-eligible installer Vermont Solar and Wind Partner

PO Box 697
Burlington, VT. 05402
www.vermontsolar.com
www.backeastsolar.com
800.286.1252 - 802.863.1202
fax 802.863.7908

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