ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Recent Posts
600 KW 120/208 3 Phase Y protection
by Yooperup. 07/24/17 12:20 PM
1913 American Electrician's Handbook
by gfretwell. 07/20/17 01:08 PM
Green House wiring
by ghost307. 07/20/17 09:10 AM
Permit Snafus...AHJs and Contractors Jump in
by HotLine1. 07/18/17 08:06 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
239,354 Are you busy
174,817 Re: Forum
167,204 Need opinion
Who's Online Now
1 registered members (sparkyinak), 49 guests, and 4 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#82083 - 10/16/02 11:34 AM High phase  
Steve T  Offline
Member
Joined: Feb 2001
Posts: 306
Oak Park, IL, USA
I had a contractor inform me that the utility required the high phase to be the C phase. I told him it has to be the B phase.

Is it acceptable to install the high phase as C phase in the CT cabinet and then become the B phase in the MDP?


2017 / 2014 NEC & Related Books and Study Guides

#82084 - 10/16/02 01:11 PM Re: High phase  
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
The high leg must be landed in the right side position in most metering equipment to make the meter work correctly. When you come out of the meter to the service disconnect, you must move it to the center position. Look at 408.3(E) and the exception.
don

[This message has been edited by resqcapt19 (edited 10-16-2002).]


Don(resqcapt19)

#82085 - 10/16/02 04:35 PM Re: High phase  
tdhorne  Offline
Member
Joined: Mar 2001
Posts: 345
Maryland, USA
Don
For the sake of my continuing education would that mean that if the metering equipment is in a separate enclosure that the high leg would have to be terminated on the B phase of the service equipment but if it is in the same enclosure as the metering equipment it can follow the metering arrangement? Understand that the only delta power I have done has been derived systems rather than service equipment.
--
Tom

[This message has been edited by tdhorne (edited 10-16-2002).]


Tom Horne

"This alternating current stuff is just a fad. It is much too dangerous for general use" Thomas Alva Edison

#82086 - 10/16/02 04:45 PM Re: High phase  
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
Tom,
You are correct. If the meter is in the same enclosure, you are permitted to keep the high leg in the C phase position. As soon as you get to a second enclosure the high leg must be in the B phase position. If you use a phase rotation meter, you will find that the high leg is always B phase. It is just something in the meter configuration that requires the high leg to be in the right hand or C phase position.
Don


Don(resqcapt19)

#82087 - 10/16/02 05:34 PM Re: High phase  
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
Some highleg whys and wherefores covered at https://www.electrical-contractor.net/ubb/Forum1/HTML/001784.html

With modern solid-state meters, aside from old customs and habits, the righthand/highleg location does not matter any more so far as accurate meter registration is concerned.


#82088 - 10/21/02 12:24 PM Re: High phase  
Steve T  Offline
Member
Joined: Feb 2001
Posts: 306
Oak Park, IL, USA
Thanks Don



Member Spotlight
RonKipperDatacom
RonKipperDatacom
Kansas City, KS
Posts: 30
Joined: January 2013
Show All Member Profiles 
Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.011s Queries: 14 (0.002s) Memory: 0.7763 MB (Peak: 0.9225 MB) Zlib enabled. Server Time: 2017-07-27 02:46:01 UTC