Red, White, Black. What to use?

Reply

  #1  
Old 01-06-16, 03:45 AM
Member
Thread Starter
Join Date: Jan 2016
Location: USA
Posts: 1
Red, White, Black. What to use?

I live in Southern Arizona in a home built in 1983. The majority of the wiring is Red, white and black, with a ground.

I removed (and capped in a junction box) some wiring to security lights after we moved in to install solar LED security lights. Long story short, I have a need to install a dusk to dawn security light to cut down on pack rats.

I took a voltmeter to the wiring and here is what I found.

Red and White = 120 volts
Red and black = +/- 10 volts

I don't remember what the black and white read as.

I got new wiring and paired the new black to the old red and the new white to the old white. I used a wire nut on the old black and was getting 120 volts at the new black and white.

Is that the correct procedure? Or should I have bundled the old black with the old white to the new white?

This whole red, black and white is a bit confusing.
 
Sponsored Links
  #2  
Old 01-06-16, 04:09 AM
chandler's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Dec 2005
Location: USA
Posts: 39,968
I don't remember what the black and white read as.
That is important for us to know. But then you said you were getting 120 v at the black and white. Often reds are switch controlled. Is there a switch in the mix? If you are getting 120 v from red to white, use them and cap off the black.

White is neutral. Red, black and colors other than gray and green are current carrying conductors, or can be if not part of a switch loop.
 
  #3  
Old 01-06-16, 04:19 AM
pcboss's Avatar
Forum Topic Moderator
Join Date: Jul 2002
Location: Maryland
Posts: 14,359
The red can be a second hot, a switched hot or part of a switching arrangement. There is no hard and fast rule.
 
  #4  
Old 01-06-16, 06:36 AM
Handyone's Avatar
Forum Topic Moderator
Join Date: Aug 2000
Location: U.S.
Posts: 5,451
Your old security lights might have used a photocell in a separate wiring box. Look around the eaves of your house and see if there's a box with a photocell.
 
Reply

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


Thread Tools
Search this Thread
Display Modes
'