MC Cable [RE-wrenches]

Bill Brooks billb at endecon.com
Tue Dec 21 20:58:35 PST 2004


 

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Allan,

So which type of cable were you referring to? MC cable is the NEC
definition. The PV industry uses MC connectors on USE-2 cable. I thought you
were referring to the use of metal-jacketed MC cable. The code says that it
can be used in exposed locations if it is marked for wet locations, but I
have never seen it used in a PV systems. Do you or anyone else have a source
for it?

Bill.

-----Original Message-----
From: Allan Sindelar [mailto:allan at positiveenergysolar.com] 
Sent: Tuesday, December 21, 2004 1:09 PM
To: New wrenches posting
Subject: Fw: MC Cable [RE-wrenches]

Wrenches,
This is a good clarification on MC cables.

----- Original Message ----- 
From: "John Wiles" <jwiles at nmsu.edu>
Sent: Monday, December 20, 2004 12:20 PM


Allan:

On the wrenches web site, I think you and Bill Brooks may be talking about
two different MC cables.

Many in the PV industry say MC Cables when they mean USE-2 single conductor
cables with MultiContact Connectors.

Type MC cable in the Code is a manufactured Metal-Clad Cable with conductors
installed in a flexible metal jacket.  See NEC Article 330.  If it is
installed in wet/outdoor locations, it must be specifically indentified for
such use.

Tray cable, Type TC is generally a suitable cable that can be used to meet
the 690.35 requirement for multiconductor jacketed cables on ungrounded PV
systems starting in 2005.  It has been around for many years, is generally
marked sunlight resistant and has a 90°C wet insulation rating.  I do not
believe that it will be compatible with a single conductor MultiContact
connector and will therefore require
direct wiring to module jboxes.   ASE Americas modules were at one
time listed with a two-conductor tray cable and a two-conductor connector
(the Alden, Pulse Lock).

UL hopefully will have a new double-insulated PV cable standard available
and single conductor, double insulated cables will be available by the time
ungrounded inverters are ready for PV systems. It will be some time before
California adopts the 2005 NEC.
-- 
If I can provide further information, please do not hesitate to call, e-mail
or fax me.

John

John C. Wiles,  Program Manager
Southwest Technology Development Institute, New Mexico State University
505-646-6105      505-646-3841 (FAX)   http://www.NMSU.Edu/~tdi
SWTDI/NMSU
Corner Research Drive and Sam Steel Way
Box 30001/MSC 3 SOLAR
Las Cruces, NM 88003-8001

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