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Tool Talk Discussion Forum

Re: Lectrical Help

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Leron Smith

02-02-2013 23:35:23

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We were using a two wire orange light test probe as well as a High Quality Fluke ANALOG test probe. It was suggested to me that the low volt in the line was used to power the lighted wall switches you can see in the dark??? how does that work?? The guy that wired the house was a retired Electrical engineer with too much time on his hands, so many things are overkill. (IE) Two way switches in closets that also affect kitchen outlets ,permanent electric wall clocks in every room,Electric furnace,junction boxes to no where, ETC. ETC>.. This was not to the earth ground test this was 10V from the the black to the white wire at the bulb outlet 14-2 . A real Rube Goldberg original. Probably very correct for 1974 standards.Thank-you for your help and ideas.

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02-03-2013 04:55:36

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 Re: Lectrical Help in reply to Leron Smith, 02-02-2013 23:35:23  
If you have lighted switches, there is a small amount of current traveling through the wires when the switch is off. If there's at least one light bulb in the circuit, then you'll see no voltage because the load of the bulb effectively grounds the switched line. But if you try to read the voltage without any bulbs installed, then you will indeed see significant voltage because the input impedance of the meter is too high to ground the circuit.

Rule number one: whenever possible, always measure voltage when there is a load on the circuit. This is true whether you're looking for an open or a short. You will get very misleading results if you try to measure voltage on circuit that has no load.

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