Linked Questions

1 vote
1 answer
1k 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 ...
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 ...
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, ...
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 ...
  • 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 ...
  • 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 ...
  • 587
1 vote
4 answers
35k 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 ...
  • 3,594
6 votes
3 answers
766 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 ...
  • 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 ...
  • 311
1 vote
1 answer
863 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 ...
  • 11
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 ...
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 (...
  • 687
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 ...
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 ...
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, ...
0 votes
1 answer
4k views

How to wire LED light to old wiring layout

Bought a new LED strip light to replace an old fluorescent light. After removing the old light I'm left with 3 grey cables coming from the ceiling.There are 3 copper ground wires are all sleeved into ...
0 votes
1 answer
2k views

Old house--no neutral wire for Nest Protect?

I'm not particularly electrically inclined, but am giving a go to setting up a wired Nest Protect where an old smoke detector was installed. The device says to connect its white wire to the white (or ...
1 vote
3 answers
2k views

One light switch controlling multiple lights

So my husband and I bought an older house (1956). After we moved in, we noticed that if we turn off a certain switch in the kitchen, we can't turn on the lights in the hall, bathroom, or bedrooms. ...
  • 11
0 votes
1 answer
2k views

How to work out which wire goes where when replacing light fixture

There are 2 neutral wires and 3 black ones and a ground. The ceiling light is on and hard wired in and I can't turn it off. The adjacent bedrooms are without power. I know I scrambled the wires so ...
1 vote
1 answer
834 views

Wiring a light fixture

I am replacing a light fixture in my bathroom with a LED fixture. My house is from the late 20s so there are some quirks. In this case I have 3 sets of wires into the box. There are 6 other lights, ...
  • 21
0 votes
1 answer
1k views

Fried dimmer turns lights on/off but new dimmer won't

I had two black wires, one red wire and two white wires coming from the ceiling (I suspect there used to be a fan with a light). In the switch box, there was a black and a white wire (with a green ...
0 votes
2 answers
283 views

How to test an electrical switch to ensure the power is off

I used a voltmeter to test for power on my electrical switch and I was surprised by a blast of electricity. You can see the damage in the picture. Why did I get a reaction? Did I test it ...
1 vote
3 answers
210 views

Test Connection for vintage lighting fitting

Out apartment has one of those vintage light fittings, with the edison bulbs in. It also has 4M high ceilings. One of the bulbs has popped and repeatedly pops if i replace it. so i'd like to take the ...
0 votes
1 answer
244 views

3 Way Switch Spark

I am trying to figure out why a spark was created when I was testing the voltage across a three way switch I have. So to make a long story short, I was trying to move some switches because I didn't ...
  • 111
2 votes
2 answers
97 views

NCV fails to still detect voltage once the circuit is loaded?

The light above the cooktop in our kitchen started flickering occasionally, and eventually just was steadily very dim. I hated the fixture, so thought I'd replace it, and also just hoping the ...
  • 135
0 votes
1 answer
78 views

No power to room

Left heater plugged in drying floor all night. Woke up to no power in room and no breaker kicked. Can't figure out what happened. Checked plug in and shows hot and ground reversed but don't no how. ...
-1 votes
1 answer
77 views

Installed ceiling lamp, but phase meter screwdriver lights up when testing its body, neutral line

I had to change a ceiling lamp, electrical installation (Europe, 240V) is quite old and i've no idea how it works. The old lamp had 3 bulbs and a wall double switch can light up 2 of the bulbs and/or ...
  • 109