Yet another basic switch loop question

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Old 01-27-19, 12:13 PM
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Yet another basic switch loop question

I googled and could not find a good answer for this one, I am replacing one overhead light, currently there are 3 sets of wires in the base ,

Set-a 3 wires (black and hot, white, bare copper)

Set-b 3 wires (black, white, bare copper) - don't know what is it for

Set-c 3 wires (black, white, bare copper) - to the switch itself

I connect the black-a to white-c, and black-c to light, then light to white-a, the light works okay, but I am wondering if I am doing it correctly, what should I do with the rest wires? Especially the Set-b wires?

Should I cap black-b with the (black-a|white-c), and white-b to white-a, and all the ground together?
 
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Old 01-27-19, 12:20 PM
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Set A and B are power in and power out. Chances are something is dead now that you are unaware of. Connect the blacks from A and B together and the whites from A and B together. This will carry power thru that box and out.

When we discuss circuiting and wire count..... grounds are not mentioned. It's understood that they be all connected together but they don't enter into the wire count.

So you have two wire cables there. Two wire plus ground.
 
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Old 01-27-19, 12:25 PM
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"Connect the blacks from A and B together and the whites from A and B together. "

I am a bit unsure, then what is the correct way to connect the C after this? Join blackC to the black bundle and whiteC to the white bundle? Thanks!
 
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Old 01-27-19, 12:28 PM
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You had the switch loop wired correctly. You are just adding in the outgoing line.

So it's A black to B black and C white
A white to B white to white of fixture..
C black to fixture.

The white of C should be taped or marked black so that it's not confused as a neutral.
 
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Old 01-27-19, 12:43 PM
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Just to confirm, when you say "A white to B white to white of fixture.." you mean A white to B white and C black, correct?

So we end up with

cap1 (A black, B black, C white)

cap2 (A white, B white, C black)

cap3 (All 3 bare copper)
 
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Old 01-27-19, 01:03 PM
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no
cap1 (A black, B black, C white)
cap2 (A white, B white, light white)
cap 3 (C black, Light black)
cap 4 (All 3 bare copper)
 
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Old 01-27-19, 01:06 PM
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oops, i just realized i was confused and had totally left the light wires out..

got it now, thanks!
 
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