Knob & Tube Switches- Shared Neutral?


Old 10-06-14, 04:55 PM
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Knob & Tube Switches- Shared Neutral?

I'm trying to replace two switches wired knob and tube in a 2 gang box with a single gang, two switch Horizontal rocker so I can use the other gang for something else. Space does not allow for a new 3 gang box.

When I pulled the plate off, there are only 3 wires coming in rather than 4, two wires go directly to terminals on the switch, and one is shared between switches. Each switch powers a different light.

When replacing, should I wire the same way? Is the shared wire the neutral in this setup? Here is a drawing:

Name:  KT_2gang.png
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Any help would be much appreciated.
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Old 10-06-14, 05:08 PM
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Only the wire on the left is power in. The wires on the right go to the lights. This box can be used to house a third switch but does not have a neutral so therefore can't power the new fixture. Easiest may be to bring power to the new fixture and use the box to house a switch loop.

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Last edited by ray2047; 10-06-14 at 07:36 PM.
Old 10-06-14, 06:42 PM
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If the neutral was attached to the switch with the hots you would have a dead short. You have one hot providing powrerto the two switches. The other two go out to the fixtures.

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