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3 sets of white, black, and ground wires in a single pole switch box

3 sets of white, black, and ground wires in a single pole switch box


  #1  
Old 02-01-17, 11:51 PM
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3 sets of white, black, and ground wires in a single pole switch box

A family friend tried fixing a light switch for me and he got confused in the process. So now all 3 black wires are twisted together, all 3 grounds are twisted together, and all 3 whites are twisted together. Ive never seen a switch box set up like this before and have no idea on how to hook it up. It only runs 1 light fixture. Can anyone help?
 
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Old 02-02-17, 01:34 AM
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Most likely one power in, one power out to the light, and one power out to another load.

First using a multimeter you must determine which cable is power in (hot) using a multimeter. (A non contact tester won't work.) Disconnect all the wires then measure between the black and white of each cable till you find one that reads ~120v. Mark the black and white wires of that cable Line.

Next you need to find which of the other two cables goes to the light. Connect one of the remaining cables to Line (black to black; white to white). If the light lights label the black and white of that cable Light. If the light doesn't light just to verify try the other unknown cable. If it lights the light label its wires Light. Label the remaining cable's black and white wires Load.
  • Connect all whites together.
  • Connect together Line black, Load black, and a pigtail*.
  • Connect the pigtail to one side of the switch.
  • Connect Light black to the other side of the switch.
  • Connect all grounds per code.

*Pigtail is a 6"-8" length of wire the same color and gage as the wires it is being connected to.
 
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Old 02-02-17, 07:35 AM
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awesome description, ray. Here's a pic of a pigtail:
Name:  Pigtail.jpg
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Size:  5.6 KB
 
  #4  
Old 02-02-17, 11:12 AM
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Really appreciate it

Thank you ray i really appreciate it
 
 

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