[RE-wrenches] Cable tray versus RMC

[wirewiz at gmail.com]

Carl,

I also have a job on a brand new SS metal roof and I just did not want put any holes in it so I am going down the side of the building and not penetrating at all. But it's only 50kW. Do you have the option of no penetration? I am curious though as to what j-box/sealing/flashing set up you were planning on using.

Larry Liesner
Wirewiz
Westport, CT
Phone: 203-644-2404
Fax: 203-557-0556
wirewiz at gmail.com
www.wire-wiz.com



On Feb 14, 2011, at 2:56 PM, Carl Adams wrote:

> I have a project for 250kW system.  4/12 pitch standing seem roof  in
> the Great Lakes snow country.   My initial proposal was to get the
> source strings through the roof and inside to serviceable combiner
> locations.  This was shot down by the architect who did not want 5
> holes punched in his new roof.  So we then shift to pass thru Jboxes
> where we transition the PV wire to THWN-2 and into RMC back to the
> desired point of entry.  The electrical sub on the project has now
> proposed to reduce expense by replacing the RMC with cable trays and
> running USE-2 in the cable tray from the JBOX back to the point of
> entry.
> 
> I'd appreciate your thoughts on the use of the cable tray and USE-2 on
> the roof top.
> 
> WIth REgards
> Carl Adams
> NABCEP cert 031508-1
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