[RE-wrenches] Neutral sizing

[Glenn Burt]

Here is the code reference explaining this conductor size disparity from 2017 NEC:

"According to Table 310.15(B)(16), a 3/0 AWG, Type THW copper conductor
has an ampacity of 200 amperes. However, for a 3-wire, single-phase
dwelling unit service, as shown in Exhibit 215.2, 310.15(B)(7) permits a
service conductor (or a main power feeder conductor) with an ampacity
of 83 percent of the service rating. This permits a minimum of 2/0 AWG,
Type THW copper conductors or 4/0 AWG, Type THW aluminum conductors
for services or a main power feeder rated at 200 amperes"

-Glenn

-----Original Message-----
From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> On Behalf Of Dana
Sent: Saturday, September 22, 2018 10:32 AM
To: 'RE-wrenches' <re-wrenches at lists.re-wrenches.org>
Subject: Re: [RE-wrenches] Neutral sizing

What about 4/04/02/0 aluminum, service feed? Or is that utility excepted?

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-----Original Message-----
From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> On Behalf Of Marco Mangelsdorf
Sent: Friday, September 21, 2018 10:39 PM
To: 'RE-wrenches' <re-wrenches at lists.re-wrenches.org>
Subject: Re: [RE-wrenches] Neutral sizing

At the risk of sounding like a grandpa Wrench...I've never had or seen a neutral conductor be smaller than current carrying.

marco

-----Original Message-----
From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Jay
Sent: Friday, September 21, 2018 3:47 PM
To: re-wrenches at lists.re-wrenches.org
Subject: [RE-wrenches] Neutral sizing

Hi all,

I’m wondering if there is code reference to size of neutral vs power conductors. 

County is requiring neutral same size as mains 240vac. 
As it’s 500 mcm due to VD (200 amp service) it’s a non trivial expense. 

I know that where I live, the utility brings in a smaller neutral than L1/L2

Thanks in advance

Jay

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