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Old 10-08-2012, 02:02 PM   #1
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Wiring - power to light then switch


Got cable running from the panel. Nothing on circuit presently.

Like to use the circuit to
1. install a light operated by a switch
2. replace the 220 AC receptacle (no longer needed) with 110 receptacle
3. add another receptacle before or after the switch.

I'd like to use the three existing cable runs, which means the power will run from the panel to a junction, then the light / switch / replacement receptacle (see pic).

I'll add the new receptacle near the switch later.

Cable from new ceiling light not shown... Black, White, and Ground.

Question is, does power going into the light first affect the wiring to the switch?
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Wiring - power to light then switch-junction.jpg  


Last edited by dcj710; 10-08-2012 at 03:04 PM. Reason: added info
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Old 10-08-2012, 04:19 PM   #2
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Wiring - power to light then switch


Quote:
Originally Posted by dcj710 View Post
Got cable running from the panel. Nothing on circuit presently.

Like to use the circuit to
1. install a light operated by a switch
2. replace the 220 AC receptacle (no longer needed) with 110 receptacle
3. add another receptacle before or after the switch.

I'd like to use the three existing cable runs, which means the power will run from the panel to a junction, then the light / switch / replacement receptacle (see pic).

I'll add the new receptacle near the switch later.

Cable from new ceiling light not shown... Black, White, and Ground.

Question is, does power going into the light first affect the wiring to the switch?
Yes.

You will need to wirenut the incoming black to the black in the cable going to the switch. At the switch, connect the black to one terminal and the white to the other. Mark the white with a black piece of tape to indicate it is NOT a neutral. The white/black then carries the switched hot line back to the light fixture, where you again mark it with black, and connect it to the black wire from the fixture.
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Wiring - power to light then switch-switchloop.jpg  

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Old 10-08-2012, 04:26 PM   #3
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Wiring - power to light then switch


he has xx-3 going to the switch, make up all blacks/whites/grounds together with the like wires, use the red from the switch to feed the light.
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Old 10-08-2012, 04:45 PM   #4
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Wiring - power to light then switch


Sorry, missed that.
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Old 10-08-2012, 07:10 PM   #5
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Wiring - power to light then switch


Not using the red at either end (xx-3 is existing cable; using it instead of running new cable). So Dave632's first diag should work. But it doesn't. I get light all the time; switch doesn't affect it.
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Old 10-08-2012, 09:02 PM   #6
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Wiring - power to light then switch


I've looked at Dave's diag (not using red wire to switch - per Techy's xx-3 comment) and ck'd the connections a few times. New switch, but replaced that anyway. I'm missing something.

The light goes on with the breaker. But it does NOT shut off at the switch. ???
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Old 10-08-2012, 09:26 PM   #7
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Wiring - power to light then switch


Quote:
Originally Posted by dcj710 View Post
I've looked at Dave's diag (not using red wire to switch - per Techy's xx-3 comment) and ck'd the connections a few times. New switch, but replaced that anyway. I'm missing something.

The light goes on with the breaker. But it does NOT shut off at the switch. ???
It would be better to use the red conductor.

At the light, black to black ... white to white (tie whites to fixture), red to switch and light, cap the white at switch.
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Old 10-08-2012, 09:33 PM   #8
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Wiring - power to light then switch


Connect the blk from panel to black "old ac" with white to switch. Connect blk switch wire at jb to fixture,connect white fixture wire to all remaining whites in jb and wire not. Connect blk and white at switch to screws and mark white with black tape.
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Old 10-08-2012, 10:12 PM   #9
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Wiring - power to light then switch


Is there any other cables at the switch? or just the 3-wire?

It appears you didn't get the correct advice here if you are adding a receptacle coming off the switch.

Connect the all the blacks together
Connect all the whites together
Red and black to the switch, cap the white for a future neutral
Black of the fixture to the red in the ceiling
White of the fixture to the 3 whites in the ceiling
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Last edited by k_buz; 10-08-2012 at 10:15 PM.
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Old 10-08-2012, 11:14 PM   #10
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Wiring - power to light then switch


Quote:
Originally Posted by sublime2
Connect the blk from panel to black "old ac" with white to switch. Connect blk switch wire at jb to fixture,connect white fixture wire to all remaining whites in jb and wire not. Connect blk and white at switch to screws and mark white with black tape.
Since you stated your not using the red ( only there because that's the wire you have available)
If there was no red wire the above would also work.
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Old 10-08-2012, 11:36 PM   #11
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Wiring - power to light then switch


No other cables at the switch.

And yes, I'd like to add a receptacle later. Receptacle could be located just before or just after the switch...either would be OK.
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Old 10-09-2012, 12:22 AM   #12
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Wiring - power to light then switch


Quote:
Originally Posted by k_buz View Post
Is there any other cables at the switch? or just the 3-wire?

It appears you didn't get the correct advice here if you are adding a receptacle coming off the switch.

Connect the all the blacks together
Connect all the whites together
Red and black to the switch, cap the white for a future neutral
Black of the fixture to the red in the ceiling
White of the fixture to the 3 whites in the ceiling
Just finished trying the above...still not right. Light's on with the breaker; off with the breaker.

Switch doesn't turn the light off.

Replaced the switch again (3rd one).

I'm doing something wrong, but damned if I can see what it is. Maybe it'll look different in the morning.
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Old 10-09-2012, 12:59 AM   #13
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Wiring - power to light then switch


Try this. Grounds not shown.
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Wiring - power to light then switch-swrecptlight.jpg  
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Old 10-09-2012, 06:53 AM   #14
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Wiring - power to light then switch


Oso954's diagram will work. Below is simialr only that the outlet(receptacle) is after the switch.
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Wiring - power to light then switch-swrecptlight-1.jpg  
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Old 10-18-2012, 08:41 PM   #15
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Wiring - power to light then switch


Changed the switch (second time). Replacement switch was bad.

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