ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Violation?
by renosteinke - 01/27/23 09:52 PM
Does NEC 551.71 (F) apply to dwellings?
by BigB - 01/20/23 10:46 AM
Power submeter connections
by HotLine1 - 01/19/23 09:09 AM
AFDD's coming to the UK
by Texas_Ranger - 01/17/23 07:22 PM
New in the Gallery:
Burger King crown sillyness
Burger King crown sillyness
by wa2ise, December 11
240/208 to a house
240/208 to a house
by wa2ise, October 9
Who's Online Now
0 members (), 11 guests, and 18 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#874 03/26/01 07:39 PM
Joined: Mar 2001
Posts: 5
A
AFFELEC Offline OP
Junior Member
we are having a problem when they pug in a comm. vac. the computers need to boot like they have lost power the computers are on seperate cir from the recepts they are using for the vac. neutrals are not shared on the same cir in question either but they are multiwire cir . they also are share the same panelboard. the ups on the computer doesnt seem to sense the problem which makes us belive there is a noise issue . we are thinking iso xfrmr but would like other sugest. thanks kevin.

#875 03/27/01 06:18 AM
Joined: Oct 2000
Posts: 5,392
S
Member
is it possible that the vacuums draw is dragging the voltage down to levels the UPS will sense here?

[Linked Image]

#876 03/27/01 09:14 AM
Joined: Oct 2000
Posts: 4,081
Likes: 3
Member
Kevin,

There's a couple of things I'm curious about.
Are you saying there's a problem with more than 1 computer? If so, are they on the same ups? At the same time? Always?
Does the UPS sound an alarm or beep?
How many times has this happened? You said they are not on the same multiwire circuit? on I'm just asking these things to get as clear a picture as I can.

Is is a long run from the panel? Never hurts to check tightness of connections.

Any power fluctuation that would affect the computer should be sensed by the UPS first. There could be something wrong with it (ups). If you're talking about 1 computer there could be some problem with it not related to the Vac. Or, you could have a voltage drop problem (for various reasons) and a ups problem.

Just tossing out some ideas.

Bill


Bill
#877 03/27/01 02:24 PM
Joined: Jan 2001
Posts: 1,044
Tom Offline
Member
I would also take a hard look at the equipment grounds from the computer receptacles and the vac receptacles all the way back to the service. A surprising number of computer problems crop up due to grounding problems. Computers reference the equipment ground but the UPS might not.

Please let us know what you find out.

Tom


Few things are harder to put up with than the annoyance of a good example.

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *
2023 National Electrical Code (NEC)
2023 NEC Now Available!
 
* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
electure
electure
Fullerton, CA USA
Posts: 4,291
Joined: December 2000
Top Posters(30 Days)
BigB 9
triple 3
Popular Topics(Views)
302,480 Are you busy
231,874 Re: Forum
216,499 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5