DC Wiring in Building (Was 600VDC switches) [RE-wrenches]

[Bill Brooks]

Jeff,

Requiring a cable tray and using tray cable are two different things.
However, you raise a very good question. XHHW-2 and RHW-2 is flame retardant
and USE-2 is allowed to be installed in a cable tray. So, if you get a cable
that has both USE-2 rating and either XHHW-2 or RHW-2 rating, it would work
fine. I have seen such wire but I am unsure what UniSolar
recommends--anybody know?

Bill.

-----Original Message-----
From: Jeffery Wolfe, Global Resource Options
[mailto:jeff at globalresourceoptions.com]
Sent: Wednesday, April 16, 2003 3:37 PM
To: RE-wrenches at topica.com
Subject: RE: DC Wiring in Building (Was 600VDC switches) [RE-wrenches]


Intermodule wiring that occurs outside. What about the UniSolar shingle
product, which REQUIRES a cable tray inside to do the inter-module wiring?

Sounds like that system CANNOT meet the NEC at this point. Yes? No?

Jeff

-----Original Message-----
From: Bill Brooks [mailto:billb at endecon.com]
Sent: Wednesday, April 16, 2003 1:17 PM
To: RE-wrenches at topica.com
Subject: RE: DC Wiring in Building (Was 600VDC switches) [RE-wrenches]



William,

Tray Cable is not fire rated so it is not allowed for wiring within an
attic. I think is perfectly fine for inter-module wiring, however.

Bill.

-----Original Message-----
From: William Miller [mailto:wrmiller at slonet.org]
Sent: Tuesday, April 15, 2003 11:38 PM
To: RE-wrenches at topica.com
Subject: Re: DC Wiring in Building (Was 600VDC switches) [RE-wrenches]


Interesting points, some raised before.  Here are some thoughts:
***snip***

There are two remaining concerns, at least in my mind:  Ground fault, which
is addressed in the code, and arcing.  PV leads can create substantial
arcing, as we have all seen.  This is why putting leads in conduit still
seems like a good idea to me, and why tray cable is not desirable.
Furthermore, PV leads should not be in proximity to combustible materials.
I have not seen any scenario in any of my installs where this proximity
would occur.
***snip**

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