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

Patrick A. Shortell pshortell6 at gmail.com
Thu Apr 21 10:35:21 PDT 2016


You should find your answers in 310.15

Patrick A. Shortell
Licensed Master Electrician
Certified Solar Installer
71 Oregon Street
Long Beach N.Y. 11561
Www.thesolarstorehouse.com


> On Apr 21, 2016, at 11:56 AM, Peter Parrish <peter.parrish at calsolareng.com> wrote:
> 
> 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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