PV and New Residential Construction [RE-wrenches]

[Barbra Kerr]

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Peter -

Not knowing what jurisdiction you are working under, please know that we are
aware of the following:

All DC wiring within walls and/or in attic must be in some type of metallic
conduit (EMT, Rigid, IMC, BX, Flex) and must be identified (use a sharpe)as
HV DC SOLAR.  The DC wiring cannot enter the interior of the house/attic
more than 10' before it lands on the DC disconnect.  Continuing the DC run
through the walls must be in metallic conduit (same as above).  The reason
given for this:  The building department does not want a remodeler,
electrician, etc... to start modifying/demoing a wall using the typical
means of a sawzall, or other such device and sustain an injury cutting thru
the hot DC wiring.  It is their belief that hitting the metallic conduit
will immediately alert them that something unusual is present in the wall,
and hopefully cause them to cease and investigate before they get to the
actual DC wires.  Once the Senior Building official explained this to us, we
supported it 100% as a life safety issue.

Typically, if the attic access allows for a person to "easily" reach the DC
disconnect (meaning that it is within an arms length of the opening) from a
ladder it is okay.  

Best o' Luck

Barbra Kerr



-----Original Message-----
From: Peter Parrish [mailto:peter.parrish at calsolareng.com] 
Sent: Monday, September 26, 2005 6:23 PM
To: RE-wrenches at topica.com
Subject: PV and New Residential Construction [RE-wrenches]

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Wrenches

 

I am working with a home under construction and we plan to deploy about
3,360W-STC of PV modules on three separate roof spaces. The client wants the
PV DC runs to be routed in the same manner as the branch circuit wiring:
drilling studs, routing Romex, etc. Inverter will be mounted on an outside
wall.

 

It would seem that once indoors, I can assume dry conditions and an ambient
of 40 deg C or less. 

 

The two questions I have are:

 

"Can I use NM cable with adequate protection (i.e. 1.25" of stud or
otherwise metal protection plates) as long as I observe the 1.56x ampacity
correction?"

 

"Assuming that the j-box where I switch from say USE-2 to NM cable must be
indoors, how accessible must it be? Attic space okay? And are attics in
southern California rated at 40 deg or less?

Peter T. Parrish
California Solar Engineering, Inc.

 


[Non-text portions of this message have been removed]

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