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Transformer #5227
11/09/01 05:08 PM
11/09/01 05:08 PM
S
Steve Miller  Offline OP
Member
Joined: Aug 2001
Posts: 325
Loudoun Cty, VA
Last week our guys had a blonde moment while setting a new 480/208 xfmr. They ran 5 wires to feed it with 480; 3 phases, neutral and ground. They attached the neutral to the X0 terminal along with the 208Y12 neutral. Once they woke up and realized we didn't need the neutral they just disconnected it and capped off both ends. Then the discussion started:
1) Is there any code violation to feed the neutral also?
2) Is there any safety or theory problem with the neutral?
3) Could they have just left it attached?

After a bunch of thinking and drawing this thing out, and staring at my Masters License, wondering if they really issued me that thing, I answered all these with a simple "I have no clue, but I know who to ask". Well people, you're it. Gimme your opinions.

Work Gear for Electricians and the Trades
Re: Transformer #5228
11/09/01 05:23 PM
11/09/01 05:23 PM
F
Frank Cinker  Offline
Member
Joined: Jul 2001
Posts: 311
Pennsylvania
Steve,

Initally, it may be misleading to the next Electrician in to service transformer. I don't think a code violation would exist if you left the neutal connected.

Re: Transformer #5229
11/09/01 06:22 PM
11/09/01 06:22 PM
N
Nick  Offline
Member
Joined: Aug 2001
Posts: 599
Riverside, CA
The first thing that comes to mind is you have created a neutral to ground bond down stream of the 480/277 service equipment. This could cause a hazard as well as desensitize ground fault protection.

250-24(a)(5)

[This message has been edited by Nick (edited 11-09-2001).]


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