ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Increasing demand factors in residential
by gfretwell - 03/28/24 12:43 AM
Portable generator question
by Steve Miller - 03/19/24 08:50 PM
Do we need grounding?
by NORCAL - 03/19/24 05:11 PM
240V only in a home and NEC?
by dsk - 03/19/24 06:33 AM
Cordless Tools: The Obvious Question
by renosteinke - 03/14/24 08:05 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), 267 guests, and 17 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#82083 10/16/02 11:34 AM
Joined: Feb 2001
Posts: 308
S
Steve T Offline OP
Member
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?

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
 

#82084 10/16/02 01:11 PM
Joined: Nov 2000
Posts: 2,148
R
Member
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
Joined: Mar 2001
Posts: 345
T
Member
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
Joined: Nov 2000
Posts: 2,148
R
Member
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
Joined: Apr 2002
Posts: 2,527
B
Moderator
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
Joined: Feb 2001
Posts: 308
S
Steve T Offline OP
Member
Thanks Don


Link Copied to Clipboard
Powered by UBB.threads™ PHP Forum Software 7.7.5