[RE-wrenches] Neutral sizing

[jay]

HI Drake and all,

Thanks for this.

As I understand this better now, maybe.  Neutral sizing changes between supply side and load side of main service panel.

Others have chimed in with an argument that can be made that if the neutral wire is sized for a 200 amp service then it should be OK even if the ungrounded wires are larger.  Yes there would be higher VD than with the 500mcm but this would only be at fully 1 phase loaded which is highly unlikely.  However the wire ampacity wouldn’t be in question even in a 100% 1 phase load.

This project the owner decided that rather than fight the county, he had the money to install the 500mcm as a neutral.

I have been just trying to educate myself for future projects and as often is the case with me and the NEC, its more complicated that I thought. 

jay
peltz power






> On Sep 23, 2018, at 10:26 AM, Drake <drake.chamberlin at redwoodalliance.org> wrote:
> 
> <38555f75.jpg> 
> 
> 
> At 09:47 PM 9/21/2018, you wrote:
>> 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 _______________________________________________ List sponsored by Redwood Alliance List Address: RE-wrenches at lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org <http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org> List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html <http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html> List rules & etiquette: www.re-wrenches.org/etiquette.htm <http://www.re-wrenches.org/etiquette.htm> Check out or update participant bios:www.members.re-wrenches.org <http://www.members.re-wrenches.org/>_______________________________________________
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