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 <[email protected]> > 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 > [email protected] > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org >
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