Dimmer wiring


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Old 10-04-13, 06:34 PM
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Dimmer wiring

Hello, new to the forum. I'm kind of stumped on this wiring. I am replacing an old dimmer with a new one and the wiring is different on each. The old dimmer has two black wires that were connected to two white wires. The new dimmer has a black, red, and green. Adding to the confusion is I have 3 sets of wires in the box. Two sets coming from the top of the box and one from the bottom left. Any ideas how this should be wired?
 
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Old 10-04-13, 07:14 PM
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What is the wiring at the light.
 
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Old 10-04-13, 07:43 PM
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It goes to 4 pot lights in the ceiling.
 
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Old 10-04-13, 08:09 PM
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Hmmmm.....interesting

It looks like you have a feed in, a feed out and a line to the lights. However it was wired completely backwards. Someone used the white wires as the hot lines and the blacks as the neutrals OR they decided to switch the neutrals instead of the hot wires.

Do you have a meter and can you check for voltage between the two whites and the box
and the three blacks and the box ?
 
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Old 10-04-13, 08:13 PM
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Welcome to the forums!

When Ray asked you
Originally Posted by ray2047
What is the wiring at the light,
he was asking you to tell us how many cables or conduits are coming into the fixture, and how each wire (except for ground wires) is connected.

It goes to 4 pot lights in the ceiling.
OK. Find the fixture the switch is connected to and describe the wiring there.

I'm kind of stumped on this wiring. I am replacing an old dimmer with a new one and the wiring is different on each. The old dimmer has two black wires that were connected to two white wires. The new dimmer has a black, red, and green.
Your new dimmer should be connected according to the installation instructions that came with it. Can you post a link to those?

At a guess, your new dimmer should be connected so that the power from your panel comes in on its black wire and the power to the lights goes out on its red wire. Can you do that, using the same wires the old dimmer was connected to?

The green wire connects to ground. Since the grounding conductors feeding your switch box were cut off after being bonded to the box, you'll need to bond your new dimmer's wire to the box.

Adding to the confusion is I have 3 sets of wires in the box. Two sets coming from the top of the box and one from the bottom left.
Wire and cable location are at the discretion of the installer. Their placement does not indicate their function. Ignore the locations.

Any ideas how this should be wired?
Not yet, other than the suggestions above. In your picture it appears that all three black wires are spliced together, two of the three white wires are spliced together, and the third white wire is separate. Is that correct, and is that the way you found it?
 
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Old 10-04-13, 08:39 PM
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The pot lights are in a bulk head so I will see if I can get into them. I have attached how it was set up before and the instructions for the new dimmer.
 
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Old 10-04-13, 08:52 PM
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Do you have a meter and can you check for voltage between the two whites and the box and the three blacks and the box ?
Can you check this for us ?
 
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Old 10-04-13, 09:12 PM
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Whites (2 on the left - right ) are 124.8

Blacks are:

Left and top are 118, left and right 124.8 and right and top are not reading anything.
 
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Old 10-04-13, 09:38 PM
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Put the three wires back together and measure the group to ground.
 
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Old 10-04-13, 09:59 PM
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Sorry feeling stupid here.... Once I put the blacks back together how would I test ground to ground?
 
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Old 10-04-13, 10:21 PM
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You're getting a little confused.

The metal box is ground.

So put the three wires back together and measure from them to the box.

Did you also measure from the two whites to the box previously ?
 
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Old 10-05-13, 03:48 PM
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Okay. Here are the readings to ground.

A .01
B .13
C 1.23
D .24
E .93
F .93
 
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Old 10-05-13, 03:51 PM
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Should I put it back the way it was and test to ground? Thank you so much for helping with this!
 
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Old 10-05-13, 04:46 PM
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What were the connections to the old switch?
 
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Old 10-05-13, 05:14 PM
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Okay. Here are the readings to ground.

A .01
B .13
C 1.23
D .24
E .93
F .93
Did you have the power on when you tested? Either it was off or you have no ground.
 
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Old 10-05-13, 05:15 PM
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A and B were joined together and the other was E
 
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Old 10-05-13, 05:22 PM
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Power was on.... C was 123.4 not 1.23
 
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Old 10-05-13, 05:41 PM
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The single white was going to the fixture. The other two should be power in and power out. These are your two connections on the switch.

I don't know why or how someone used the wrong colors for your hot conductors.
 
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Old 10-05-13, 05:47 PM
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Yeah... I'm not surprised... Seemed like a mess to me. So which should I be using for my new dimmer (black and red wires)?
 
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Old 10-05-13, 06:39 PM
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Finding hot on the black means the circuit was wired correctly and just that device was incorrectly wired. Look in the box and tell me what white wire goes with which black wire and I'll give you the correct wiring.

white A and black ?
white B and black ?
white E and black ?
 
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Old 10-05-13, 06:53 PM
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Power was on.... C was 123.4 not 1.23
OK, that makes sense and nails things down. PJ has already posted the next step.
 
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Old 10-06-13, 04:40 PM
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A white and C black
B white and D black
E white and F black



A .01
B .13
C 1.23
D .24
E .93
F .93
 
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Old 10-06-13, 08:07 PM
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Ok....

A white and C black (feed in)
B white and D black (feed out)
E white and F black (light)

I would leave the tags on until you make sure everything is ok.

You will connect all three white wires together and put a wire nut on them.
You will connect black C and black D together with the black wire of the dimmer.
You will connect black F with the red wire of the dimmer.
The green needs to connect to the screw in the back of the box.
 
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Old 10-07-13, 10:41 AM
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Lightbulb

Thanks everyone it is working! Big thumbs up!
 
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Old 10-07-13, 10:46 AM
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Excellent, thanks for letting us know.
 
 

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