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#30845 10/29/03 11:43 PM
Joined: Oct 2003
Posts: 4
W
Whitey Offline OP
Junior Member
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.

#30846 10/30/03 06:01 AM
Joined: Oct 2000
Posts: 2,722
Broom Pusher and
Member
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!
#30847 10/30/03 09:41 PM
Joined: Feb 2003
Posts: 687
A
Member
A problem with the panel or transformer bonding the nutral to ground?

#30848 10/31/03 11:10 AM
Joined: Oct 2003
Posts: 4
W
Whitey Offline OP
Junior Member
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.


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