ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Air Compressor feeder conductor sizing
by Potseal. 01/15/18 09:08 PM
VDE 0100 to introduce AFCIs
by LongRunner. 01/15/18 11:38 AM
Under carpet cable?
by HotLine1. 01/15/18 09:57 AM
Any New Years Resolutions?
by Bill Addiss. 01/13/18 10:21 AM
New in the Gallery:
Housebilding DIY wiring
SE cable question
Who's Online Now
1 registered members (andey), 10 guests, and 7 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
low voltage #1729
05/23/01 10:15 AM
05/23/01 10:15 AM
M
mechcmdr  Offline OP
Junior Member
Joined: May 2001
Posts: 2
I have a hallway light that won't turn on. When I took a reading I have only 48V at the switch when I should have 120V, of course. It's probably something simple, but to someone who don't know. Any Ideas?

Work Gear for Electricians and the Trades
Re: low voltage #1730
05/23/01 01:03 PM
05/23/01 01:03 PM
A
Anonymous
Unregistered

>I have a hallway light that won't turn on. When I took a reading I have only 48V at the switch
It's wired to your phone line instead of your electric line.

Re: low voltage #1731
05/23/01 02:28 PM
05/23/01 02:28 PM
S
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,340
mechcmdr;
do you mean you have 120V going into, and 48V coming out of(to the light) the switch?

if so can the switch...

Dspark,
if that were true, he could dial his own number for some lights!
[Linked Image]

Re: low voltage #1732
05/23/01 02:35 PM
05/23/01 02:35 PM
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,888
NY, USA
mechcmdr,

Where are you putting the test leads when you get 48v?

Bill

Re: low voltage #1733
05/23/01 02:40 PM
05/23/01 02:40 PM
A
Anonymous
Unregistered

>do you mean you have 120V going into, and 48V coming out of(to the light) the switch?
If that were true, wouldn't the light at least be glowing yellow?

Bill is onto something about lead placement.
Is something else running on the circuit that is working?

I would measure DC voltage and see whether it is -48. If so, it's a phone line.

My recommendation is to replace the bulb (with 60 watts or less, of course).


[This message has been edited by Dspark (edited 05-23-2001).]

Re: low voltage #1734
05/23/01 03:55 PM
05/23/01 03:55 PM
R
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
mechcmdr,
What type of meter are you using?
Don(resqcapt19)


Don(resqcapt19)
Re: low voltage #1735
05/25/01 11:13 PM
05/25/01 11:13 PM
M
mechcmdr  Offline OP
Junior Member
Joined: May 2001
Posts: 2
I took the reading across the hot and common on the switch. I'm using a Wavetek volt/ohm meter. So I am guessing I have 48V coming to the switch. I took a reading on a few of the other light swithches in the house for reference and I got 120V on them and of course I get 0V when I turn on the light. And no, It's not phone wire.

Re: low voltage #1736
05/26/01 12:00 AM
05/26/01 12:00 AM
A
Anonymous
Unregistered

>I took the reading across the hot and common on the switch.

That won't necessarily work.

You need to measure between the line and a ground.

It sounds like perhaps an open neutral on the circuit.

Your problem is NOT low voltage.


[This message has been edited by Dspark (edited 05-26-2001).]

Re: low voltage #1737
05/26/01 06:45 AM
05/26/01 06:45 AM
C
C.Urch  Offline
Member
Joined: May 2001
Posts: 36
Kill Devil Hills, NC USA
Like DSPARK says, you need to read between the common and ground. Sounds like it is a 3-way switch which may have gone bad.


Featured:

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

 

Member Spotlight
HCE727
HCE727
Delaware County, PA, USA
Posts: 186
Joined: November 2005
Show All Member Profiles 
Top Posters(30 Days)
sparky 24
Admin 19
Potseal 13
Popular Topics(Views)
243,510 Are you busy
180,296 Re: Forum
170,800 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.039s Queries: 14 (0.005s) Memory: 0.9940 MB (Peak: 1.1609 MB) Zlib enabled. Server Time: 2018-01-16 13:30:02 UTC