The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
Wow, that was close!
by jraef
11/28/16 07:06 PM
Earthquake in New Zeeland
by RODALCO
11/27/16 11:25 PM
Calling all Non-US members!! (Non-US only)
by Tjia1981
11/27/16 06:33 AM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 9
Texas_Ranger 8
sparkyinak 7
Trumpy 6
Who's Online
0 registered (), 240 Guests and 3 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#5227 - 11/09/01 02:08 PM Transformer
Steve Miller Offline
Member

Registered: 08/30/01
Posts: 322
Loc: 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.

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#5228 - 11/09/01 02:23 PM Re: Transformer
Frank Cinker Offline
Member

Registered: 07/29/01
Posts: 317
Loc: 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.

Top
#5229 - 11/09/01 03:22 PM Re: Transformer
Nick Offline
Member

Registered: 08/13/01
Posts: 603
Loc: 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).]

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals