Linked Questions

1 vote
1 answer
975 views

Voltage tester detecting voltage in non-hot wires when the light switch is off [duplicate]

I just switched the wiring of a single-pole light switch from back wiring to side wiring and noticed that my voltage tester (non-contact pen-style one, Klein Tools NCVT-3) detects voltage in both the ...
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36 votes
3 answers
28k views

When doing electrical work, what do I use to check wires are safe?

If I am thinking of replacing a light switch, a light-fitting, a socket/outlet or doing other work with household wiring where there may be 120 Volts or 240 volts present ... There is already a ...
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10 votes
4 answers
13k views

3 phase (delta) power to single phase space heater

I bought a 240V single phase, space heater for heating up a warehouse space. The warehouse has 240V power in a delta configuration (no neutral). My understanding is that in a delta configuration, ...
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5 votes
3 answers
3k views

Which terminal to use on my multimeter

I have read the manual for my new multimeter but unsure which (red) terminal to use for what. The meter has one VΩmA fused 500 mA max terminal and one Unfused 10A Max terminal. I just want to measure ...
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  • 729
5 votes
1 answer
1k views

Replaced Blower Motor, but A/C won't stay on unless power button is held down

My HVAC has an electric furnace blower motor for both heating and cooling. I called a repair guy out who explained that the capacitor was good, I just needed a new motor because it had gone out. I ...
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  • 187
9 votes
2 answers
3k views

Is a negative reading from a non-contact voltage detector sufficient?

I'm a beginner at doing electrical work, and I want to make sure I'm not taking unnecessary risks. Let's say that I'm preparing to work on some wiring. I have a non-contact voltage detector that ...
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  • 587
1 vote
4 answers
34k views

Why would three-way switch travelers both show as hot?

We have a three-way switch setup to control our living room light. Our staircase is on the far wall of our living room and one switch is downstairs while the other is at the top of the stairs. The ...
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  • 3,594
6 votes
3 answers
762 views

Replacing a power outlet safely

I want to replace some power outlets in my condo with ones that have built-in USB ports. The condo was built in 2008. My thinking is I can simply turn off the breaker for those outlets and get to ...
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  • 459
6 votes
3 answers
4k views

Electrical box - What are all these wires?

I want to install a light fixture on a box that's in the ceiling. I opened it up and I saw WAY MORE wires than I expected. I expected just a green, black and yellow wire. Here are two photos of the ...
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  • 311
1 vote
1 answer
854 views

Why do my new basement lights trip the breaker?

I am upgrading my basement and the builder initially put the family room and two lights in the basement all on one circuit. During the remodel I tried adding two more lights to that same run and it ...
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  • 11
1 vote
1 answer
6k views

Proper way to test AC voltage for dishwasher hookup

I am trying to connect my new dishwasher to the electrical cable coming up into my kitchen from down in the basement. This (white) cable actually houses 3 smaller wires inside of it: A white wire (...
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  • 677
3 votes
2 answers
6k views

Stud sensor finds current on large wall area

The detached garage for my home was built by the previous owner in 2000, the garage interior is naked particle board directly on wood studs, and the insulation has paper backing (not foil). When ...
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6 votes
2 answers
4k views

Why is voltage detected in my ceramic tile floor?

I found out (in a rather uncomfortable manner) that there is a potential difference between the phase line in my home and the ceramic tile floor. My Fluke multimeter reads 30V AC, I assume the reading ...
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6 votes
2 answers
3k views

How is it possible to get an electric shock even with mains power off?

I was changing a socket outlet yesterday. I switched off the mains power at the consumer unit (the big red switch) so thought all was safe. I disconnected the old socket, but when I went to fit the ...
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0 votes
2 answers
2k views

Electricity tripping off after installing Nest [closed]

I just replaced my old thermostat and timer for a Google Nest, but every time I turn the electricy back on, it goes off shortly after. I have an oil boiler for heating. Before I call an electrician, ...
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