The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Forum Software Upgrade coming soon...
by gfretwell
01/17/17 01:16 PM
Why cables look like they do
by Texas_Ranger
01/17/17 12:33 PM
Re: Fabricating Guards out of Lexan?
by ghost307
01/17/17 11:21 AM
Would ELV branch circuits be a good idea?
by ghost307
01/17/17 11:18 AM
100% breakers?
by Texas_Ranger
01/16/17 06:13 AM
New in the Gallery:
Desk-mounted "power-board"
Shout Box

Top Posters (30 Days)
HotLine1 19
Webmaster 14
Trumpy 12
ghost307 12
gfretwell 10
Who's Online
2 registered (ghost307, gfretwell), 0 Guests and 78 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#48305 - 02/08/05 08:58 PM 50 Volts
HoseB611 Offline
Member

Registered: 12/24/02
Posts: 16
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?

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#48306 - 02/08/05 10:18 PM Re: 50 Volts
gfretwell Online   content


Member

Registered: 07/20/04
Posts: 9059
Loc: Estero,Fl,usa
That is just a problem with these new high impedance meters. Withno load on the line you will see antenna effect.
_________________________
Greg Fretwell

Top
#48307 - 02/09/05 01:49 AM Re: 50 Volts
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
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

Top
#48308 - 02/09/05 02:55 AM Re: 50 Volts
marcspages Offline
Member

Registered: 10/15/04
Posts: 49
Loc: London, UK
A (near) full description of this can be found here .

M.

Top


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals