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cnreadle 11-24-2012 04:48 PM

Old wiring in an old house
 
In an old house I tried to put a wall switch in the bathroom. Got the new wire run and ready to hook up but I noe realize I only have two wires one coming in the box and one going out of the box. I don't know what to do. Help

SuperJETT 11-24-2012 05:00 PM

Call an electrician. Not to be rude, but seriously, if that is stumping you, then you should have an electrician doing it for you.

TTW 11-24-2012 05:11 PM

I'm assuming you have 2 wires coming in and out of a light fixture box?
Should be 1 hot and 1 neutral.
You need to switch the HOT conductor, not the neutral conductor.
The neurtal stays connected to the light, the hot wire coming into the box connects to the black wire going to the new switch. At the switch, the black wire connects to one screw on the switch, and the white to the other screw. THE WHITE MUST BE RE-IDENTIFIED AS A HOT CONDUCTOR. This is done by wrapping black electrical tape around the white wire in at least one place, the tape must completely encircle the wire. At the light fixture, you attach the white wire from the switch to the old hot terminal on the fixture. The white wire MUST be identified as a hot here also.

If you are not comfortable doing this, or identifying the hot conductor, you really should have an electrician hook it up for you, especially in a bathroom where things get wet.

joecaption 11-24-2012 05:20 PM

The info posted could not be more wrong.
Please hold in there for a real electrition to post the right ansewer.

TTW 11-24-2012 05:23 PM

Please correct me then, I believe I did give a good answer, if not I will gladly edit and correct it or completely delete it.
It is never my intension to give bad , misleading, or incorrect information, never.

k_buz 11-24-2012 05:24 PM

I'm not fully understanding why you ran a new wire, is it to feed another switch, or simply another light using the existing switch?

Either way, it sounds to me like you either have knob and tube wiring or a switch loop. Either way, you will not be able to extend this wiring to feed something else.

Edit...You need to be more specific with what you are trying to do and what is already existing.

TTW 11-24-2012 05:45 PM

OK, the white wire going from the lighting fixture should be connected to the HOT (not the black wire), and the black wire coming back from the switch should be connected to the fixture.

I did have that wrong, code reference below:

200.7 (C) (1)

Exception (1)
If part of a cable assembly that has the insulation permanently reindentified to indicate its use as an ungrounded conductor by marking tape, painting, or other effective means at its termination and at each location where the conductor is visible and accessible. Identification shall encircle the insulation and shall be a color other than white, gray, or green. If used for single-pole, 3-way, or 4-way switch loops, the reidentified conductor with white or gray insulation or three continuous white stripes shall be used only for the supply to the switch, but not as a return conductor from the switch to the outlet.

joed 11-24-2012 06:52 PM

What you are describing is a switch loop. The user may not have a switch loop.
We need clarification if the user has two wires or two cables(four wires) in the switch box.

bobelectric 11-24-2012 07:43 PM

Knob and tube is my vote.

jlmran 11-24-2012 08:00 PM

Quote:

Originally Posted by bobelectric
Knob and tube is my vote.

Vanilla Ice is my vote.

cnreadle 11-25-2012 07:48 AM

Quote:

Originally Posted by k_buz (Post 1059403)
I'm not fully understanding why you ran a new wire, is it to feed another switch, or simply another light using the existing switch?

Either way, it sounds to me like you either have knob and tube wiring or a switch loop. Either way, you will not be able to extend this wiring to feed something else.

Edit...You need to be more specific with what you are trying to do and what is already existing.

There was a light with only a pull chain switch. I am trying to install a wall switch. There is only one single wire coming in the box and one single wire going out of the box. I am comfortable with most wiring but not this situation. Thank you for your response.

cnreadle 11-25-2012 07:51 AM

old house wiring
 
There was not a wall switch. Only a pull chain from the light socket. I am trying to run a wall switch. There is only one single wire coming into the light box and one single wire going out. Thus my problem

jlmran 11-25-2012 07:58 AM

Quote:

Originally Posted by jlmran

Vanilla Ice is my vote.

CNREADLE - you are a legitimate poster. Please accept my apology.

TTW 11-25-2012 08:00 AM

http://i1294.photobucket.com/albums/...7/DSC00277.jpg

SuperJETT 11-25-2012 08:05 AM

So, you have an unswitched light (has a pull chain but that's fixture mounted) on a box with 2 wires in it. One wire will be hot, the other neutral. You would put a switch loop on the hot leg in that box and make sure to relabel the white wire as mentioned because it becomes a hot wire.


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