ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Underground phone and coax depth?
by libellis - 02/08/23 08:38 PM
Al Hildenbrand - Minneapolis - obituary
by Bill Addiss - 02/03/23 07:38 PM
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
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 (), 118 guests, and 11 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#48305 02/08/05 11:58 PM
Joined: Dec 2002
Posts: 18
H
Member
Why is it when you have a switched outlet (the top is switched and the bottom is always hot), you turn off the switch that there is still 50 volts reading on the switch leg? When you ground the switch leg the voltage goes away? Electrical phenomenon?

#48306 02/09/05 01:18 AM
Joined: Jul 2004
Posts: 9,791
Likes: 14
G
Member
That is just a problem with these new high impedance meters. Withno load on the line you will see antenna effect.


Greg Fretwell
#48307 02/09/05 04:49 AM
Joined: Jan 2003
Posts: 4,391
I
Moderator
NEMA calls this 'phantom voltage' and it is real voltage with almost no current.

The wire that you are getting 50 volts on is picking this up simple by running next to other live wires.

You meter draws so little current it can measure this phantom voltage.

Try the same thing with an older analog meter.

Or use a set of Wiggys and a digital at the same time and you will see 0 volts on the digital.


Bob Badger
Construction & Maintenance Electrician
Massachusetts
#48308 02/09/05 05:55 AM
Joined: Oct 2004
Posts: 48
M
Member
A (near) full description of this can be found here .

M.


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
Lostazhell
Lostazhell
Bakersfield, CA (Originally Orange Co.)
Posts: 1,438
Joined: February 2004
Top Posters(30 Days)
triple 2
Popular Topics(Views)
303,310 Are you busy
232,265 Re: Forum
217,022 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5