ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
90.5(C) Explanatory Material 2023
by renosteinke - 07/14/24 02:48 PM
Hello... again!
by renosteinke - 07/14/24 02:14 PM
2023 CEU Course
by renosteinke - 07/12/24 03:26 PM
Counterfeit Code Books?
by Comprehensiveedu - 07/12/24 12:16 PM
Old low volt E10 sockets - supplier or alternative
by gfretwell - 07/11/24 08:51 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
0 members (), 538 guests, and 13 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#190025 11/03/09 05:05 PM
Joined: Mar 2003
Posts: 849
Y
Member
Em. Generator Breaker off that feeding service rated Firepump controller/Transfer Switch..
Service from Transformer feeding service rated fire pump controller/transfer switch (same).
From Generator Since breakers on Gen. Set its a Feeder.
From Transformer to to Service rated control/Transfer switch its Service conductors.
Generator side its 3 hots & Ground.
Transformer side its 3 hots & Neutal.(250.24C)
Neural & Ground terminate together at this point ????

Any one else run into this???
Yoopersup

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
 

Joined: Mar 2005
Posts: 1,213
S
Member
Originally Posted by Yoopersup
Em. Generator Breaker off that feeding service rated Firepump controller/Transfer Switch..
Service from Transformer feeding service rated fire pump controller/transfer switch (same).
From Generator Since breakers on Gen. Set its a Feeder.
From Transformer to to Service rated control/Transfer switch its Service conductors.
Generator side its 3 hots & Ground.
Transformer side its 3 hots & Neutal.(250.24C)
Neural & Ground terminate together at this point ????

Any one else run into this???
Yoopersup
If it's a delta generator, I hope it's a delta pump. If it's a delta pump, you don't need a neutral. 250.24(C) doesn't apply to delta panels, as the AC system is not grounded at any point.

Easy answer: don't run the neutral.

Joined: Mar 2003
Posts: 849
Y
Member
480/277 Volt System at both Generator & Service Thus Neutral required per 250.24c to ist disconnect switch per code.Since Feeder Neutral is not required only equipment gr. But Service requires Neutral.
Yoopersup


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