[RE-wrenches] Cable tray versus RMC

[Carl Adams]

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