ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

Topic Options
Rate This Topic
#84458 - 04/02/03 12:07 AM Undersized neutral????
nykr95 Offline
Junior Member
Registered: 04/02/03
Posts: 2
Hi!

I recently replace an existing 30AMP 2 Pole with a 30AMP 2 Pole GFCI on my main panel. This breaker services my pool equipment - which are mostly 240 but also have some 120 lights and misc equip. I noticed that the 2 hot conductors are either #8 or #10 copper but the neutral (white) is #12. Is this normal? Is there a chance that it can overheat? Can it effect the voltage since the drop is about 100 feet? If necessary what can be done to remedy the situation other than pulling a new neutral conductor?
Top
2017 / 2014 NEC & Related Books and Study Guides
#84459 - 04/02/03 05:51 AM Re: Undersized neutral????
GEO Offline
Member
Registered: 03/12/03
Posts: 47
Loc: Lancaster,Pa
is it a main or branch(feeding 1 piece of equipment)breaker? GEO
Top
#84460 - 04/02/03 05:54 AM Re: Undersized neutral????
electure Offline


Member
Registered: 12/24/00
Posts: 4259
Loc: Fullerton, CA USA
I commend you for installing the GFI, but without further information about your equipment, none of us can safely make a call on this.
I'd suggest you hire a qualified, licensed electrician to check this out for you.
Top
#84461 - 04/02/03 12:06 PM Re: Undersized neutral????
nykr95 Offline
Junior Member
Registered: 04/02/03
Posts: 2
My friend who is a licensed electrician will be coming out this weekend to look at it. I also checked the voltages at the pool pump - and found it is 175V - while it is 240V at the Main panel. Isn't that an awful high voltage drop? Its about a 100 foot run.
Top
#84462 - 04/03/03 05:48 PM Re: Undersized neutral????
John Steinke Offline
Member
Registered: 04/03/01
Posts: 518
Loc: Reno,Nv., USA
It's time for a pro to look at your set-up. That is way too much voltage drop- I'm guessing that there is another problem waiting to be found. Voltage drop, under load, should not exceed 5%. A 240 v. motor should not be run at less than 204 V.
In theory, it is sometimes permissible to reduce the size of the neutral. For a 30 amp circuit, however, you are required to use a full-size (#10) neutral. Also, the use of different size wires is likely to cause GFI problems.
Top

Member Spotlight
Member Since: 11/17/00
Posts: 2232
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
2 registered (ampherder, sparkyinak), 56 Guests and 8 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 47
HotLine1 43
gfretwell 19
Ruben Rocha 12
Trumpy 9
 
Newest Members
KrmtFrg, Stack, Scotto, Freecrowder, clee512

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals