Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 09-29-2008, 01:35 PM   #1
Newbie
 
Join Date: Sep 2008
Posts: 5
Rewards Points: 10
Default

stray voltage - commercial application - 3PH


Hi guys (and gals),
I need some help from you 3-ph experts. I have a piece of equipment at work that is causing me fits. It is a 3-ph application with motors and plc/low voltage components. I am getting stray voltage somewhere, probably from the main panel. It looks like I am getting about 25VAC from somewhere. I first noticed this when we were putting the cover on the 3-ph plug outlet box (we use plugs and flex/SO cable for alot of these small machines since the move from room to room sometimes. So far, this one has not moved), when installing the metal cover, I saw a small "static-like" spark jump from the screwdriver tip to the screw. you don't notice any indications of this unless you have worked with the machine for a while and then go across the room and touch the metal door to leave the room, where you get a pretty nice static discharge. My guess is that the 25v or so that is excess and "bleeding" into the machine somewhere is causing you to become "charged", and when you tough the door, you go to ground. Make sense? Anyhow, I didn't know if there were some "standard" places to look for small current leakages like this or not. Any advice is appreciated.
J

jeffjohnson1 is offline   Reply With Quote
Old 09-29-2008, 03:18 PM   #2
Member
 
Join Date: Dec 2007
Posts: 84
Rewards Points: 75
Default

stray voltage - commercial application - 3PH


Quote:
Originally Posted by jeffjohnson1 View Post
Hi guys (and gals),
My guess is that the 25v or so that is excess and "bleeding" into the machine somewhere is causing you to become "charged", and when you tough the door, you go to ground. Make sense?
No, it doesn't make sense. A static spark that you can feel is going to require at least a couple of thousand volts, not 25V, and it's going to take a DC voltage to charge you up, not AC.

Matsukaze is offline   Reply With Quote
Old 09-29-2008, 05:07 PM   #3
Licensed Electrical Cont.
 
Speedy Petey's Avatar
 
Join Date: Feb 2004
Location: NY State
Posts: 6,864
Rewards Points: 2,032
Default

stray voltage - commercial application - 3PH


This doesn't exactly sound like DIY work to me.
__________________
Sometimes I feel like if I answer any more questions it is like someone trying to climb over a fence to jump off a bridge and me giving them a boost.
Answers based on the 2008 & 2011 NEC.
Speedy Petey is online now   Reply With Quote
Old 09-29-2008, 06:08 PM   #4
Member
 
Join Date: May 2008
Location: Apple Valley, MN, USA
Posts: 1,000
Rewards Points: 502
Send a message via AIM to theatretch85
Default

stray voltage - commercial application - 3PH


Quote:
Originally Posted by Speedy Petey View Post
This doesn't exactly sound like DIY work to me.
I would agree, commercial setting with 3 phase power? I think this would be something better left to an electrician.
theatretch85 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Low voltage box question WShawn Electrical 7 08-19-2008 06:22 AM
2 - 900w tansformers on a 15A circuit? tonyBagadonuts Electrical 19 07-20-2008 07:15 PM
Stray Voltage in Fiberglass Pool Billy C Electrical 5 06-21-2008 03:10 PM
Voltage Drop Issues sushiboy Electrical 12 04-03-2008 09:01 PM
Low voltage to vacuum l.schrankel@comcast.net Electrical 2 03-04-2007 09:38 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.