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Old 02-16-2011, 01:15 PM   #1
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Behavior of non-contact voltage detector


I just got a Fluke 1AC-A II non-contact voltage detector.

It seems to work correctly when I test receptacles.

My question is about testing light switches (plastic cover not removed).

These switches are all simple on-off light switches, no 3-way, 4-way or dimmers.

Some switches only give me a positive voltage indication when ON. Others give a postive when ON or OFF.

Why would that be?

Thanks.

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Old 02-16-2011, 03:15 PM   #2
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Behavior of non-contact voltage detector


Depends on the magnectic field caused by the Electron flow in the circuit.

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Old 02-16-2011, 04:46 PM   #3
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Behavior of non-contact voltage detector


Might depend on where that circuit is fed from, or the position of the wires inside. If one of the always on wires is near the plate then you are probably picking that up.
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Old 02-16-2011, 05:48 PM   #4
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Behavior of non-contact voltage detector


Because there is a constant hot always attached to one side of a single pole switch and its a crapshoot as to if that tester is going to pick up the magnetic field through the wall plate.

Never trust that tester by the way. Never.
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Old 02-16-2011, 06:33 PM   #5
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Behavior of non-contact voltage detector


Quote:
Originally Posted by Mr. Shed View Post
Never trust that tester by the way. Never.
I learned that the hard way.

It's funny how fast anything you are holding ends up on the ground when you touch a live wire.
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Old 02-17-2011, 08:22 AM   #6
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Behavior of non-contact voltage detector


I removed the plastic cover plate, and then the detector was able to detect the voltage. All the connections are back-stabbed, and the wires were all pushed behind the switches, so maybe the wires were too far away with the cover plate on.

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