ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Extension cords
by annemarie1. 09/25/18 06:06 PM
220/230/240V 60Hz Systems
by gfretwell. 09/23/18 02:50 PM
Inspection camera help
by petey_c. 09/22/18 07:52 AM
Motion detectors and dimmers
by gfretwell. 09/20/18 04:02 PM
Acronis Backup 2017
by gfretwell. 09/16/18 12:46 AM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 9 guests, and 21 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Power Spike on A Phase #6910
01/14/02 05:28 PM
01/14/02 05:28 PM
C
C.Urch  Offline OP
Member
Joined: May 2001
Posts: 36
Kill Devil Hills, NC USA
Did a service call today at a municipal building where a breaker powering some receptacles (copy machine, computer, fax, etc.) trips intermittently...no rhyme or reason ever few days or so. One phase in the subpanel reads a steady 25 amps while the other spikes every 3 to 10 seconds between 15 and 40 amps. The only circuits in the panel are lighting and receptacle loads. Does anyone have a clue as to what might be causing this?

Work Gear for Electricians and the Trades
Re: Power Spike on A Phase #6911
01/14/02 05:41 PM
01/14/02 05:41 PM
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
Get that no good #$@@@*& copier on its own circuit. There is a heater in it that is cycling & them babies can draw some serious power for a split second.

Other than that, your SWAG is as good as mine.

Tom


Few things are harder to put up with than the annoyance of a good example.
Re: Power Spike on A Phase #6912
01/14/02 05:52 PM
01/14/02 05:52 PM
A
Anonymous
Unregistered

Dealt with that problem once too. Moved the copier to a dedicated circuit and solved the problem. The newer copiers seem to draw a lot more than the older ones.

Re: Power Spike on A Phase #6913
01/14/02 05:55 PM
01/14/02 05:55 PM
W
WARREN1  Offline
Member
Joined: May 2001
Posts: 176
Greenville, SC, USA
Have you tried a recording ampmeter over a longer period of time? Maybe one of those Flukes that record the harmonics? Harmonics would be my first impression since you have computers, printers and copy machines.
Just a thought.

Re: Power Spike on A Phase #6914
01/14/02 06:16 PM
01/14/02 06:16 PM
R
Redsy  Offline
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
Copier gets my vote.

Re: Power Spike on A Phase #6915
01/14/02 07:09 PM
01/14/02 07:09 PM
electure  Offline

Member
Joined: Dec 2000
Posts: 4,274
Fullerton, CA USA
copier

Re: Power Spike on A Phase #6916
01/16/02 12:25 AM
01/16/02 12:25 AM
S
SPARKSALOT  Offline
Member
Joined: Dec 2001
Posts: 28
Omak, WA, USA
Copier,absolutly. Recently I responded to a call of a CB tripping every now and then with a chronic problem of lamps flickering. Turned out to be three copiers, any of which would cause the lamps to brown out and on the rare occasion when all three cycled at the same time the CB would trip.
Don


Featured:

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

 

Member Spotlight
waymag
waymag
dallas, texas, USA
Posts: 68
Joined: January 2002
Show All Member Profiles 
Top Posters(30 Days)
Admin 13
BigB 4
Popular Topics(Views)
249,478 Are you busy
187,394 Re: Forum
176,736 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.024s Queries: 14 (0.004s) Memory: 0.9819 MB (Peak: 1.1365 MB) Zlib enabled. Server Time: 2018-09-26 12:59:33 UTC