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

[Bill Brooks]

Jeff,

To comply with the 2002 NEC, you are required to have a disconnect in a
readily accessible location (e.g. hallway) at the nearest point of entry
(for BIPV it may already be in the building (e.g. 10 feet from the
entrance). Almost impossible to comply with the 2002 code. Just because I
work on the committee does not mean that I agree with everything in the
code. Anyone can (and they do) submit proposals and some of the bad ones get
adopted.

Bill.


-----Original Message-----
From: Jeffery Wolfe, Global Resource Options
[mailto:jeff at globalresourceoptions.com]
Sent: Wednesday, April 16, 2003 7:37 PM
To: RE-wrenches at topica.com
Subject: RE: DC Wiring in Building (Was 600VDC switches) [RE-wrenches]


Bill,

My point is not about the wiring types and enclosures, I know I can make
that work. BUT, I've now brought a "service" into the building, without a
disconnect switch, in a cable tray, which even if enclosed, is still not a
solid conduit. I'm just wondering how an aggressive inspector would view the
presence of this "unprotected" wiring inside, no matter what the wire type.

Jeff

-----Original Message-----
From: Bill Brooks [mailto:billb at endecon.com]
Sent: Wednesday, April 16, 2003 5:49 PM
To: RE-wrenches at topica.com
Subject: RE: DC Wiring in Building (Was 600VDC switches) [RE-wrenches]



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

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