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

[Ray Walters]

Also look at the notes to the tables in Chapter 9.  For conduit fill,=20
all wires are counted.  310.15 covers ampacity derating for more than 3=20
current carrying conductors in the raceway. The key is "current carrying=20
conductors".  The neutral definitely carries current.  You don't have to=20
count grounding conductors, control, or signal wiring for that ampacity=20
derating, because they don't create heat.  But they still count for=20
conduit fill, though.

R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760

On 4/21/2016 11:35 AM, Patrick A. Shortell wrote:
> 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 <http://www.thesolarstorehouse.com>
>
>
> On Apr 21, 2016, at 11:56 AM, Peter Parrish=20
> <peter.parrish at calsolareng.com <mailto:peter.parrish at calsolareng.com>>=20
> wrote:
>
>> I am working with a customer who is doing a complete remodel and=20
>> addition to his house: stripped to the open studs and floor joists,=20
>> and rafters. Not a wire in the house. We have designed a 14.4 kWp PV=20
>> system with 16 kW of storage for backup and load shifting. The main=20
>> panel, inverters, critical load subpanel and batteries are all going=20
>> to be in the garage which is about 45 feet from the house. The=20
>> customer and I have identified the critical loads.
>>
>> The GC is running conduit from the main house to the garage. I have=20
>> been given seven (7) 1-1/2=E2=80=9D PVC conduits, and I am currently doi=
ng=20
>> conduit fill, ampacity and voltage drop calculations for the branch=20
>> 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=20
>> they do, but the electrician stated quite emphatically that  they=20
>> didn=E2=80=99t. I thought that the derating calcs for CCCs were based so=
lely=20
>> 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 <mailto:petertor at pobox.com>
>>
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