Hot answers tagged

20 votes
Accepted

One circuit in house losing voltage

Sounds like a bad connection. 99.9% of the time, that will be at a device or in a junction box - wire breaks in the wall (away from a device or junction box) are exceedingly rare. If any of the ...
Ecnerwal's user avatar
  • 210k
14 votes

Is it wrong to run ground wires all the way through conduit to each junction box?

Yeah, what you did was "belt and suspenders". Doesn't hurt, doesn't help much. Feel free to do that anytime you want. I tend to do it when I am concerned with physical damage to the EMT, e....
Harper - Reinstate Monica's user avatar
14 votes
Accepted

If my 240v cooktop does not have a neutral, is it safe just to cap the neutral and leave it?

You go by the instructions(if listed by UL/CSA). They can override local or NEC rules usually. If a 240volt device (stove) does not use 120 volt (clocks, fans), it does not need to have a neutral ...
crip659's user avatar
  • 23.7k
13 votes

Should a UPS be unplugged when working on the electrical circuit it is plugged in to?

The UPS battery won't be backfeeding into the house service. DC current won't be flowing back through the rectifier diode. I'd be more concerned about doing something wrong with your switch ...
JACK's user avatar
  • 79.8k
12 votes
Accepted

Crossing the neutral wires between line and load on a conventional (non-GFCI) duplex outlet?

It makes no difference, perhaps it was more convenient for the person wiring it up. Or they got it connected on Neutral, and changed their minds about which side was going to be up before wiring Hot. ...
Ecnerwal's user avatar
  • 210k
12 votes

Why does this work when plugged into GFCI and blow a house circuit breaker when plugged into standard outlet

You should learn what a Multiwire Branch Circuit is, as that's probably what you plugged your suicide cord in to. Such circuits are common in Kitchens, particularly, and have the halves of the outlet ...
Ecnerwal's user avatar
  • 210k
12 votes

Is a #10 wire circuit on a 50A breaker ok?

Yes there will be a problem. If the wires are in conduit they will probably over heat, melt the insulation, short out phase to phase and hopefully trip the breaker or possibly burn in the clear. If ...
JACK's user avatar
  • 79.8k
12 votes

Is a #10 wire circuit on a 50A breaker ok?

TL;DR You May Have Even Bigger Problems 10 AWG wire indicates you likely had a standard tank water heater on a 30A circuit. You replaced it with a 54A tankless water heater, which according to the ...
manassehkatz-Moving 2 Codidact's user avatar
11 votes

What is this component wired into a bench grinder motor?

Single phase bench grinders typically use Capacitor Start motors, which would typically use a centrifugal switch inside of it to take the starting capacitor off line once it is at speed. But because ...
JRaef's user avatar
  • 14.9k
11 votes
Accepted

Should a UPS be unplugged when working on the electrical circuit it is plugged in to?

While this should be acceptable, I have personally found a UPS which backfed 240AV out its input pins. I only found this out when brushing against the exposed pins on the wall plug - That UPS went ...
Criggie's user avatar
  • 10.5k
11 votes

How can I fit a 60A EV circuit breaker in my service panel?

Tesla Model 3 owner here. Target being able to charge the car to 80% from say 20%. So for a Model 3, that’s around 200 miles or so. At 48A, that’s about 44MPH. So about 4.5 hours. So 9 hours if ...
Dave Markle's user avatar
10 votes

How can I fit a 60A EV circuit breaker in my service panel?

Don't go overboard with charge rate Charge rate is programmable - You don't have to charge at 60A. And probably can't without a service upgrade. But we can avoid that cost. Here's a great video on a ...
Harper - Reinstate Monica's user avatar
10 votes
Accepted

Can I wire my infrared heating panels to my existing circuits?

TL;DR Only # 1 is legal. The first 15A circuit should be OK. The number to use is actually 12A/1,440W (often referred to as 1500W based on 125V). That's because lighting and these panels are ...
manassehkatz-Moving 2 Codidact's user avatar
10 votes

How can I determine the purpose of a breaker in my panel?

First, consider that there may be outside electric outlets, or wiring in place to prepare for installation of a new device, such as over-oven microwave, outdoor lighting, pool or well pump or an air ...
DrMoishe Pippik's user avatar
9 votes

Can I pigtail #10 and #14 wires in my service panel?

Don't do that! What you're proposing, using two 15A breakers as a substitute for one 30A breaker, is called Circuit Breakers in Parallel and is the topic of NEC 240.8: 240.8 Fuses or Circuit ...
Jeff Wheeler's user avatar
  • 3,382
9 votes

outlet tripping circuit

There are many problems with the wiring and workmanship in the pictures: At the outlet, Power (black) and Neutral (white) are wired on the same Neutral side of the outlet. This results in a short ...
Triplefault's user avatar
  • 7,280
8 votes

How dryer machine works in india 240v

Taking a USA dryer to India was very probably a huge waste of time, effort and money. The heating elements use 240V (Hot to Hot), but in most cases the motor, timer, controls etc. on USA models use ...
Ecnerwal's user avatar
  • 210k
8 votes

How to interpret circuit tester result

but when I press the yellow button on the Kobalt rather than the GFI popping the right side yellow LED goes dim etc. While you are pressing the button on the tester, light indications are totally ...
Harper - Reinstate Monica's user avatar
7 votes

Rewire outlet circuit: Location of outlets, wire run alternatives, GFCI best practice, and outlet spacing

I have never seen any requirements as far as the minimum height of electrical outlets, they can even be installed on the floor. Routing your cables through junction boxes and pigtailing to the outlet ...
JACK's user avatar
  • 79.8k
7 votes

Crossing the neutral wires between line and load on a conventional (non-GFCI) duplex outlet?

Note "Line" refers to a wire pair of both hot and neutral. There's no such thing as Line and Load on plain outlets They're all "Line". The screws and the brass strip they attached ...
Harper - Reinstate Monica's user avatar
7 votes

Ground has power

You have a broken neutral wire, or a non-connected (disconnected, loose connection that's come apart) neutral connection. Broken wires (away from junction boxes) are rare, so it's most likely a bad ...
Ecnerwal's user avatar
  • 210k
6 votes

14/3 Wire + Double Pole Breaker, Two 120v Circuits?

Well it IS a MWBC. It just happens to be one that serves one outlet on the one side, and (presumably you've checked that the other outlets do actually turn off when the breaker does) the remainder of ...
Ecnerwal's user avatar
  • 210k
6 votes

Is it wrong to run ground wires all the way through conduit to each junction box?

If the EMT conduit was installed with the proper connectors into a main panel that's properly grounded, then the EMT is all that's needed. Running the additional ground wire wasn't needed. There's no ...
JACK's user avatar
  • 79.8k
6 votes

Rewire outlet circuit: Location of outlets, wire run alternatives, GFCI best practice, and outlet spacing

Height is fine. While there's a lot of "developed convention" in putting them 16-18" above the floor, actual code is within 18" (?) of the wall in the floor to less than 5'6" (...
Ecnerwal's user avatar
  • 210k
6 votes

Any reason to change 15a receps to 20a receps (20a breaker, 12 gauge wire, Kitchen)

The breaker trips will not be affected, in any way, by changing the receptacles. 15A receptacles are 100% code compliant on a 20A circuit, as long as there are at least 2 - and a duplex counts as 2. ...
manassehkatz-Moving 2 Codidact's user avatar
6 votes

outlet tripping circuit

From the new pictures you have quite a few problems. Thanks for the pictures. On the the outlet,first problem, black goes on the other side. Not doing so created a full blown short circuit. Second ...
crip659's user avatar
  • 23.7k
6 votes

30amp double pole breaker - safe to plug in bounce house?

Update BUT I also discovered the microwave/wall oven combo unit requires 40A and I think it’s currently on 30A. That's not necessarily a problem, because ovens and ranges are weird. A typical ...
Harper - Reinstate Monica's user avatar
6 votes

How can I wire one switch to control two circuits (different breakers)

One very viable way to solve this problem very nicely is to simply replace both of the existing switches with the Lutron Caseta series smart switches. Lutron also has the PICO remote module which is a ...
Michael Karas's user avatar
  • 64.3k
6 votes
Accepted

Dryer, laundry, bathroom in 3/4” flex FMC?

It fits, and it fits (at 34.63%) if you add the 10 AWG copper ground you need, because flex does not get the pass on needing an explicit ground wire ground that rigid metal conduit does. Unless ...
Ecnerwal's user avatar
  • 210k
6 votes

Can abruptly turning the main power switch to a heat pump off while running in cool mode damage the unit?

In my experience turning off a compressor while it is running does not cause damage. What can cause damage is to immediately turn it back on before the pressure on the high side has had a chance to ...
Jim Stewart's user avatar
  • 21.5k

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