ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
VDE 0100 to introduce AFCIs
by sparky. 01/20/18 05:09 PM
MRI LED lights dimmer control replacement - wow!
by Potseal. 01/19/18 08:52 PM
Video: Inventor of the GFCI self-testing shocks
by Bill Addiss. 01/17/18 11:11 PM
FPE in Germany
by HotLine1. 01/17/18 07:07 PM
Fujifilm Recalls Power Adapter Wall Plugs
by Admin. 01/16/18 07:04 PM
New in the Gallery:
Housebilding DIY wiring
SE cable question
Who's Online Now
1 registered members (gfretwell), 12 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Power problem #30845
10/29/03 10:43 PM
10/29/03 10:43 PM
W
Whitey  Offline OP
Junior Member
Joined: Oct 2003
Posts: 4
South Baptiste,Alberta,Canada
Maybe someone has run across this before,i was called to check some plugs in a school recently,the complaint was a fried microwave oven and computers,i tested the voltage at the plugs and it was 180V between neutral and the hot wire,also 117V between neutral and ground.There were 8 wires leaving the panel in emt feeding aprox 20 plugs,6 hots 2 neutrals,service to school is 3phase 4wire.It appears only one of the circuits was affected,a red circuit,i turned the breaker off one at a time until problem cleared,it appears a black circuit was causing the problem and the voltage returned to normal on the affected circuit.Is this a possible open neutral problem? any responses are appreciated.

Work Gear for Electricians and the Trades
Re: Power problem #30846
10/30/03 05:01 AM
10/30/03 05:01 AM
Scott35  Offline

Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,708
Anaheim, CA. USA
Sounds like maybe you have a 4 wire Delta system here!?
180-208 VAC from L-C would be found on one ungrounded conductor (typically ØB).

If not, look for open noodle situation on that branch circuit, or possibly on the Subfeed.

Scott35


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
Re: Power problem #30847
10/30/03 08:41 PM
10/30/03 08:41 PM
A
Active 1  Offline
Member
Joined: Feb 2003
Posts: 687
Grayslake IL, USA
A problem with the panel or transformer bonding the nutral to ground?

Re: Power problem #30848
10/31/03 10:10 AM
10/31/03 10:10 AM
W
Whitey  Offline OP
Junior Member
Joined: Oct 2003
Posts: 4
South Baptiste,Alberta,Canada
Just an update,turns out the problem was a neutral splice in a device box that was not twisted in the wirenut properly, intermittently under a heavy load, i believe it would arc and open circuit.


Featured:

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

 

Member Spotlight
togol
togol
NW In. USA
Posts: 421
Joined: September 2005
Show All Member Profiles 
Top Posters(30 Days)
Admin 20
sparky 16
Potseal 15
Popular Topics(Views)
243,581 Are you busy
180,379 Re: Forum
170,855 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.018s Queries: 14 (0.004s) Memory: 0.9579 MB (Peak: 1.0878 MB) Zlib enabled. Server Time: 2018-01-21 17:58:04 UTC