[RE-wrenches] Does a Netral COunt as a CCC

[Peter Parrish]

I am working with a customer who is doing a complete remodel and addition to
his house: stripped to the open studs and floor joists, and rafters. Not a
wire in the house. We have designed a 14.4 kWp PV system with 16 kW of
storage for backup and load shifting. The main panel, inverters, critical
load subpanel and batteries are all going to be in the garage which is about
45 feet from the house. The customer and I have identified the critical
loads.

 

The GC is running conduit from the main house to the garage. I have been
given seven (7) 1-1/2" PVC conduits, and I am currently doing conduit fill,
ampacity and voltage drop calculations for the branch circuits that
represent the critical loads.

 

So I have two questions:

 

(1)    Should I stick to a <1% voltage drop on all circuits?

(2)    Do 120 V neutrals count as current carrying conductors? I think they
do, but the electrician stated quite emphatically that  they didn't. I
thought that the derating calcs for CCCs were based solely on ohmic losses
and phasing was not taken into account.

 

Does the NEC provide guidance on this latter situation?

 

-          Peter Parrish

 

Peter T. Parrish, Ph.D.

President, SolarGnosis

1107 Fair Oaks Ave.

Suite 351

South Pasadena, CA 91030

(323) 839-6108

petertor at pobox.com

 

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