Author Topic: Help with old desk lamp switch connection  (Read 1135 times)
tj
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Help with old desk lamp switch connection « on: September 24, 2024, 06:47:00 PM » Author: tj
I have been unable to figure this out.  Can someone lend me a hand?  Thanks.
tj
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sol
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Re: Help with old desk lamp switch connection « Reply #1 on: September 24, 2024, 09:11:18 PM » Author: sol
On the switch, the black button should be normally closed and should be wired as the power switch to the whole circuit. The red button should be normally open and is wired instead of a starter. Pressing the red button is like having the starter operate and will turn on the lamp. When you press the black button, you momentarily interrupt the power, turning the lamp off. When you release the black button, it completes the circuit again but the lamp will not light because it needs to be started by the manual starter loop which will only happen when the red button is pressed again.
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Baked bagel 11
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Sulo2fan
Re: Help with old desk lamp switch connection « Reply #2 on: September 25, 2024, 04:12:52 AM » Author: Baked bagel 11
Asbestos wiring on the switch?
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Laurens
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Re: Help with old desk lamp switch connection « Reply #3 on: September 25, 2024, 01:16:47 PM » Author: Laurens
Looks like normal cloth covered wire to me. But it can easily be tested by taking it outside and holding a lighter under it. If it burns, it's not asbestos. Obviously take care not to breathe any fibres if it *is* asbestos, that's why you have to do it outside.
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tj
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Re: Help with old desk lamp switch connection « Reply #4 on: September 25, 2024, 04:37:01 PM » Author: tj
Thank you.  I do understand the operation of the switches.  What I am not getting is which wire goes where. Four coming from the switch and two on the transformer. Only four at the base of the lamp, two in two out. See new photo.  Thanks again.
tj
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Patrick
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Re: Help with old desk lamp switch connection « Reply #5 on: September 25, 2024, 06:42:44 PM » Author: Patrick
Typical preheat fixture wiring would resemble the attached diagram.  Here the switch is connected to the hot lead (A) and one of the ballast leads (B).  However, you don't have a starter, so the starter hooked up to leads C and D goes away.  Instead, C and D will be connected to the other terminals on the switch.

What I'm not sure about is which two terminals on the switch are for continuous power and which are for starting.  Somebody else might know that, or you can test continuity yourself.  The two with continuity when pressing and holding red only are for starting and would be connected to C and D.
 
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Sulo2fan
Re: Help with old desk lamp switch connection « Reply #6 on: September 25, 2024, 09:11:19 PM » Author: Baked bagel 11
I'm a little paranoid about asbestos because a light which I have has what I thought was regular cloth wiring but turned out to be asbestos.
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tj
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Re: Help with old desk lamp switch connection « Reply #7 on: September 25, 2024, 10:32:23 PM » Author: tj
Thank you.  I'll see if I can sort it out with your info.  I will let you know.
tj
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