Existing Wiring - Head Scratcher - Electrical - DIY Chatroom Home Improvement Forum

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


Thread Tools
Display Modes
Old 09-02-2010, 11:32 AM   #1
Join Date: Sep 2010
Posts: 2
Rewards Points: 10

Existing wiring - head scratcher

I'm replacing a light with a fan, so I replaced the box for more support. This circuit seems to go all over the place, involving 6 light switches and 3 rooms. There were (2) 14-2 wires and (1) 14-3 wire coming in to the light box (although there are no 3-way switches on the circuit). When rewiring, I started questioning myself so I got out my meter. I'm getting weird voltages across various hot (black) wires where I expected none. In one case, I get 97 volts across my main hot red lead coming from the light switch (when measured across the main black coming from the circuit breaker) when the switch is OFF. When I turn the switch ON, i get 120v. On two other hot leads going to other switches I get 120v when measuring to the main black line. If I tie all the blacks together (except for my hot red coming from the switch for that light, and tie all the whites together, everything seems to work and be happy at 120v across the black and white bundle, and I get 120v across the red hot and white bundle, so my fan/light will work fine. My problem is that I'm confused, and I don't want to cover up a potential fire hazzard just because "it works".
The only thing that would make some logical sense to me is if some device or devices on the circuit were in the 'ON' position, then would that allow voltage to bleed from the white side of a the circuit to the black side? That may be totally wrong, but it seems like a possibility to my brain... I can't justify any other reason why I'd be able to measure voltage across two 'hot' wires.

Thanks for thoughts... sorry for the long post.
dank713 is offline   Reply With Quote
Sponsored Links
Old 09-02-2010, 05:06 PM   #2
Join Date: Aug 2010
Location: north central pa
Posts: 589
Rewards Points: 1,005

i would recomend you sort out the wires by finding where they are coming from. do not just tie like colors together, sometimes people wire whites as switched hot and don't re-color code the wires. once you sort them out write back with questions.
TimPa is offline   Reply With Quote
Sponsored Links
Old 09-03-2010, 12:01 PM   #3
Super Moderator
joed's Avatar
Join Date: Mar 2005
Location: Welland, Ontario
Posts: 18,846
Rewards Points: 24,034
Blog Entries: 11

Tell us all the cables/wires in the switch box and the fixture box.
joed is online now   Reply With Quote
Sponsored Links

Thread Tools
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
Help with updating old wiring joside Electrical 2 03-30-2010 08:16 PM
Cloth Wiring - Replace? JessicaGus Electrical 9 09-23-2009 06:45 PM
wiring from existing panel to new garage al99m Electrical 8 07-29-2009 08:42 PM
Wiring multiple lights off of an existing light?? n00b Electrical 22 06-21-2009 04:37 PM
Permit application harder than the wiring job itself - WA State blschmitz Electrical 2 01-18-2008 07:36 PM

Top of Page | View New Posts