ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
Forums Calendar Active Threads
ECN Shout Chat
ShoutChat
Recent Posts
Do we need grounding?
by gfretwell - 04/06/24 08:32 PM
UL 508A SPACING
by tortuga - 03/30/24 07:39 PM
Increasing demand factors in residential
by tortuga - 03/28/24 05:57 PM
Portable generator question
by Steve Miller - 03/19/24 08:50 PM
New in the Gallery:
This is a new one
This is a new one
by timmp, September 24
Few pics I found
Few pics I found
by timmp, August 15
Who's Online Now
1 members (Scott35), 392 guests, and 13 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 2 of 2 1 2
Re: 3 phase feeder with only (1) 120 volt circuit
sparkync #209990 05/20/13 05:40 PM
Joined: Jul 2004
Posts: 9,928
Likes: 34
Estero,Fl,usa
G
gfretwell Offline
Member
Thanks Yooper
I knew I was missing something but I just could not find it.
This is at the end of 215.2(A)(1)

Quote
The size of the feeder circuit grounded conductor shall not be smaller than that required by 250.122, except that 250.122(F) shall not apply where grounded conductors are run in parallel.


This came in 2005

Greg Fretwell
Stay up to Code with the Latest NEC:


>> 2023 NEC & Related Reference & Exam Prep
2023 NEC & Related Reference & Study Guides

Pass Your Exam the FIRST TIME with the Latest NEC & Exam Prep

 >> 2020 NEC & Related Reference & Study Guides
 
Re: 3 phase feeder with only (1) 120 volt circuit
sparkync #209991 05/20/13 06:05 PM
Joined: Oct 2002
Posts: 830
NC
S
sparkync Offline OP
Member
So if it cannot be smaller than the equipment ground required according to table 250.122, for a 125 amp breaker the minimum neutral would be #6 copper or #4 aluminum.

Re: 3 phase feeder with only (1) 120 volt circuit
sparkync #209993 05/20/13 06:39 PM
Joined: Jul 2004
Posts: 9,928
Likes: 34
Estero,Fl,usa
G
gfretwell Offline
Member
At this point you might want to consider not running a neutral at all and running a separate circuit for that one 120v load.

Greg Fretwell
Page 2 of 2 1 2

Moderated by  dougwells, electure, gfretwell, HotLine1, Scott35, Trumpy 

Link Copied to Clipboard
Member Spotlight
waymag
waymag
dallas, texas, USA
Posts: 70
Joined: January 2002
Top Posters(30 Days)
dsk 1
ale348 1
Popular Topics(Views)
319,208 Are you busy
243,980 Re: Forum
227,747 Need opinion
Privacy Policy · Forum Rules · Mark All Read · Forum Help · ECN Forum
Powered by UBB.threads™ PHP Forum Software 7.7.5