Questions tagged [120-240v]

For question dealing with 120/240V single split phase electrical circuits.

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How should I convert a 240V stove outlet to 120/240V?

I removed an electric cooktop and installed a gas one. The gas cooktop needed a 15 amp receptacle for the igniter. The electric cooktop was hardwired but had a double gang box. I installed a 20amp 240 ...
OpieTaylor 's user avatar
0 votes
1 answer
98 views

Why am I measuring 40 amps on a 120V 15A receptacle? [closed]

I was testing a standard 120V 15A receptacle, got 120v but 40 amps. I've never come across this. I'm looking for guidance on how to correct or if this is correct and doesn't need to be fixed. Please ...
Sean's user avatar
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7 votes
2 answers
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Can I run wires from separate panels through the same conduit?

I own a duplex and the attached shed is divided in 1/2 for each side of the duplex. On the rear exterior are the 2 electrical panels, one for each side of the duplex. I was going to install hookups ...
tacomaguy20's user avatar
0 votes
1 answer
80 views

How to add 240v sub-panel from meter main lug of 1950's

Current meter main lug (100A), which is at outdoor, goes to a sub-panel inside house. I want to add a sub-panel (240v), which is also at outside, from the main lug. One option is to replace the meter ...
user3792705's user avatar
0 votes
3 answers
82 views

120v AFCI breakers tripping due to lost 240v leg in same panel

I had a weird electrical problem and found the fix, but I'd love to understand the mechanism by which this happened. Disclaimer: I'm not an electrician, buyer beware, etc. The symptom I had was 3 ...
FixStuff's user avatar
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0 answers
40 views

240 volt patio heater on timer won't turn off

We had a 240V ceiling mounted patio heater installed 10 years ago and last year the timer switch started buzzing loudly when the heater was turned on. I swapped out the timer switch with what I ...
Andrew West's user avatar
0 votes
1 answer
79 views

Dead Electrical Leg - Ground or wire-nut and “Abandon”/Tuck?

I have a mess of a “finished” basement in CA (California) that was wired atleast 4x 1922, 1940-50, 1980 and again in 2020, before I came to own the pile of garbage. I am redoing a lot of the wiring ...
bwp8nt's user avatar
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2 answers
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Installed Tesla gen 3 home charger with 60amp breaker and car pulling 48 amps. The conduit from charger to power panel is approx 4 ft

The conduit gets so hot you can't keep touching it. The certified electrician used #6 THHN. should #4 wire be used?
Gary D. Giebel's user avatar
0 votes
2 answers
63 views

Wiring thru the wall A/C

I need to wire a 20 amp, 240 volt, single yoke, double pole breaker for a thru the wall A/C. Also reknown as "115/240". Using 12g wire running 40 feet. I've seen this done using 12/2 and ...
Josh Scott's user avatar
3 votes
1 answer
345 views

Should I cover this exterior 120V wire?

I have an exterior wire in the garden. Most likely this is the connection to the external lights. Should I cover this and how? I'm in Seattle, which is usually wet outside.
Captain Jack sparrow's user avatar
15 votes
7 answers
5k views

What are the advantages of running a power tool on 240 V vs 120 V?

I just purchased a band saw and I have the option of running it at 120 V or, by opening the cover on the motor and swapping around a couple of wires, running it at 240 V. In general, I understand that ...
FreeMan's user avatar
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1 vote
2 answers
124 views

Cross Check: 120v-240v combo circuit over subscription

I am looking to confirm my understanding of how my circuit would fail on an over current event. I have a single phase 40a 240v circuit run with four 8awg solid copper wire (two hots, neutral, and ...
unexpected's user avatar
9 votes
7 answers
7k views

Will installing European outlet in US change frequency to 50Hz?

I'm planning to buy a Siemens coffee machine from Europe. It uses 220-240V 50Hz. Previous models work just fine in USA using 240V outlet (my electrician was able to get it done, I bought leviton 5031-...
Anis's user avatar
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4 votes
2 answers
467 views

Should non-working US 110V AC GFCI outlet that shows open neutral, but trips and resets fine be replaced?

I have a GFCI outlet that has not worked for a while. The downstream outlet (there is only one from what I can tell) connected to it worked for a while, but no longer does. I decided to find out more ...
user3236841's user avatar
2 votes
1 answer
659 views

Why would each leg suddenly read 240 volts power drop in part of my house every 5-10 minutes?

Problem started when I woke up with no power in my bedroom. I checked the box and no breakers were tripped, so I tried to turn on a tv that I have hooked to my security system. The tv went up in ...
Chris G Giles's user avatar
0 votes
1 answer
133 views

Thermostat to control electrical baseboard heater

I wanna install 8 electrical baseboard heaters. So I need 3 circuits so I won’t over load them. So I wanna know if there’s a way to just install one thermostat
user162853's user avatar
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1 answer
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Need to run 2 110 AC from a 220 4 wire drop line on a dual 30 amp breaker

I have a $0 budget I need to run 2 110 AC units on 1 240 10g 4 wire supply line on a dual 30 amp breaker. Is this possible
Greg Bruno's user avatar
0 votes
3 answers
156 views

How Important is addressing Ground Reverses?

I have one of those pocket checkers. It indicates a "Hot Ground/Reverse" on one outlet and a "Hot Neutral/Reverse" on another outlet. Should I be worried? Should I avoid those ...
Paulb's user avatar
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4 votes
3 answers
5k views

Can I jump 120V across legs to power both sides of a panel?

I have installed a new sub-panel in our barn. We do not need a lot of power so I only ran 8/2 copper. My intention was to make the sub-panel 120v only by using a jumper for the second hot lug. Now I’m ...
Brian's user avatar
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2 votes
1 answer
1k views

Combining 240V and 120V outlets on the same circuit

I have a unused 20amp double pole circuit breaker (240/250V) at the panel. I would like to use it to control one 240V outlet (with L1, L2, G connections, no neutral) and two 120V outlets. My thinking ...
Misha0001's user avatar
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1 answer
324 views

Feeding a breaker panel through a 120v outlet [closed]

Okay...so I have a shack we use during events. It has 240 panel inside that feeds 3 florescent lights and plug in. It was powered through a 6awg power cord that plugged in to an outlet off of a power ...
Andrew's user avatar
  • 11
0 votes
2 answers
97 views

Can you replace a 120 V outlet w/ 240V outlet if there are 4 other 120 V outlets on the existing 120V breaker? Can a 240v breaker also run 120V?

I installed a dedicated 240 V outlet next to my breaker box outside to power my new A/C. I am currently running an extension cord. I would like to replace an existing 120 V outlet inside the house ...
Kyle's user avatar
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2 votes
2 answers
856 views

Pulling a 120v outlet from an existing 240v hot-water heater line

I have a 240v hot water heater that is directly wired ... meaning the heavy cable from the wall goes into the water heater. I want to add a powered anode to deal with sulfer-smelling water and the ...
mikem's user avatar
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0 votes
1 answer
310 views

240 volt to 120 volt plug from HVAC blower motor

I am trying to place both germicidal lamps (approx 70 watts total) and a negative ion generator in my air condition return space where the blower motor is. My fist advice was to run these two devices ...
G G LINDSAY's user avatar
2 votes
1 answer
1k views

Can I add a 120v circuit to my 240v hot tub disconnect box?

I have a load box that feeds power to my hot tub -240 50amp. There are no additional slots to add breakers. Wondering what your experts suggest to be the best solution to keep the hot tub feed and add ...
GoReadySet's user avatar
0 votes
1 answer
384 views

Powering shed with generator

I built a shed behind my house and want to use it as a small living space in the event of loss of power that can be heated/cooled. The shed is powered by a 30 amp breaker set and has four wires to the ...
ThatGuy's user avatar
0 votes
1 answer
116 views

120 volt wire loses voltage randomly

I recently ran a wire on a known 15 amp breaker to an outdoor GFCI outlet. Have 120 volt at the tie in, 120 volt at the outlet, all good. Then last night I lost all power at the outlet, now shows ...
Mike's user avatar
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0 votes
1 answer
133 views

Split 240V Generator powering 2x GFCI 120V receptacles

Standalone application I have a 4 wire 240V Generator going to a 2pole 120/240V rated breaker, One pole feeds Line side Hot of #1 GFCI Other pole feeds Line side Hot of #2 GFCI The wiring between ...
user152379's user avatar
1 vote
1 answer
182 views

240 to thermostat for electric heat reading 120v and 70v

I had an electrician in to replace some thermostats a few months ago. One of the thermostats that was replaced was an older analog dial type. The electrician replaced it with a digital thermostat ...
user151407's user avatar
4 votes
4 answers
2k views

Is a 120V/208V MWBC good enough for 240V loads?

As detailed in a previous post, I was planning to use the dryer circuit in my condo as a MWBC. A 120V/20A outlet between one of the two hot conductors and neutral would power my small washer and dryer ...
MarcoD's user avatar
  • 435
2 votes
1 answer
690 views

"Lending" the ground wire of a 120V/15A circuit to a 240V/30A circuit

I have read in a previous forum post Is it OK to borrow a ground wire from a different circuit? that NEC in article 250.130(C)(4) allows the grounding of an ungrounded circuit by connecting to an ...
MarcoD's user avatar
  • 435
0 votes
1 answer
2k views

Change 110 outlet to 220

I’d like to move my clothes dryer. It requires a 220 plug. I used to have a whirlpool bathtub that was on its own 110 outlet. Can I convert the existing 110 outlet to a 220 outlet with needing to ...
Italiano's user avatar
0 votes
1 answer
295 views

Can you wire a regular 120/125v recepticle with two hots? [closed]

I have some LED Grow lights that can take 120/240/277 volt of power. The power cord is a a regular 125v plug w/ ground. My question is can I wire a regular 125v recepticle with two hots (1 on brass ...
Long Lee's user avatar
0 votes
3 answers
681 views

Upgrading wiring to detached garage subpanel

My garage is a 2 car detached garage is approximately 33ft from the house. My current setup (previous owners doing) is a 15a breaker (main panel) to 12/2 UF in a metal (aluminum?) piping that runs ...
RCP1990's user avatar
1 vote
2 answers
4k views

2 Pole 20amp Breaker used to power 120v circuit?

In my panel I found a 2 pole 20amp breaker connected to 12/3. When I trace this circuit, it begins to power outlets in my dining room. At outlet 1, the 12/3 comes in with the Red leg powering the ...
Jason's user avatar
  • 11
2 votes
1 answer
763 views

Wiring for switched NEMA 6-20R and 5-20R in same box in garage

My goal is to have 20A receptacles in a particular spot in my garage dedicated to power tools (such as saws) whose motors can be configured for either 240V or 120V, with a switch as a handy second ...
Matt Thomas's user avatar
1 vote
2 answers
521 views

Can 4 wire 240v circuit 30amp also support a 120v outlet

I'm planning to run a four 10g wire 30 amp circuit to supply 240v for an electric dryer. I'm wondering if I can add a 120v outlet to this and only use one outlet at a time on the same circuit, instead ...
simgineer's user avatar
  • 127
9 votes
3 answers
2k views

Can you use a 2 pole 2-slot wide breaker to provide 240V?

Forgive my ignorance in terminology, I am a computer engineer but not an electrician. The concepts make sense to me, but I don't know all the industry standards and jargon. I recently had a 240V ...
brenzo's user avatar
  • 383
9 votes
6 answers
6k views

Can I safely plug a 15A 100V appliance into a 20A 250V wall outlet?

I have a convection microwave oven that has a normal 15A 100V plug. I can only conveniently access a 20A 250V outlet, which looks like this: (I am located in Taiwan). Are there any safety issues ...
lifeformed's user avatar
1 vote
3 answers
658 views

Can I get 120 from a leg of 240 in this setup

Similar questions have been asked but not exactly. This is a 240V fuse box that the air conditioner installers recently put in. It has 2 legs of 120 and a ground wire coming from the junction box. Is ...
mtp's user avatar
  • 11
11 votes
5 answers
7k views

Why would replacing this 240 V outlet with a 120 V outlet trip my breaker?

I recently replaced a 20 A 250 V single outlet with a 20 A 125 V single outlet so that I could use it for my microwave in the kitchen. The original outlet had two gold screws and a grounding screw. ...
Amy B's user avatar
  • 119
1 vote
1 answer
520 views

Is it possible to convert this range outlet to L6-20P?

I have this outlet, formerly used for an old kitchen range, currently unused and I am eyeing a device which is described as "208/240V 20A, L6-20P Plug". Is it possible to convert this? Am I ...
chx's user avatar
  • 223
0 votes
2 answers
418 views

Can I use a 3-wire+ground to serve a 240v and a 120v circuit?

When I remodeled my home, in anticipation of replacing an old gas water heater with a new electric heater, I had a 10/3 cable run to the basement utility room. Now the heater has been delivered I ...
Peter's user avatar
  • 1
0 votes
2 answers
139 views

Will I have issues in summer with 120v outlets sharing a double pole breaker with my 240v a/c outlet?

I just moved into a 2 bedroom apartment and am planning ahead for summer. While figuring out the breaker box so I don’t put more than one window a/c on a particular circuit I found out all of my 120v ...
bmccour's user avatar
0 votes
2 answers
3k views

Running both a 120v and 240v extension cord in generator simultaneously

Can I plug both the 120v and 240v extension cords into my champion 9000w generator?
Bob Thomae's user avatar
10 votes
8 answers
4k views

Do travel voltage transformers really not have grounding?

Example 220v-to-110v converter here. It seems like it accepts a 110V plug with grounding, and yet the converter itself only has a two-pronged plug (to a 240v outlet). Does this mean that plugging a ...
ispiro's user avatar
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1 vote
0 answers
128 views

powering a split phase 220v appliance from a single 220v phase

I have a well water pump which works on 220v split phase and have a single phase 220v solar inverter. Can I just connect the hot wire with 220v to either wire and use the other wire as neutral?
Kike_mskt's user avatar
0 votes
2 answers
694 views

120V on a 240V, 30 amp circuit? Brain has zero volts

Facts: old Eaton/Cutler Hammer panel with type BR breaker. Double pole 30 amp breaker, 240V, controls two wall heaters and two zone thermostats in two rooms. Heaters and thermostats and my brain got ...
DAS's user avatar
  • 899
0 votes
0 answers
62 views

My dryer on my laundry center stopped working

Can i run my laundry center on 120v for the washer portion only and disconnect the dryer completely? I only have 1 240v outlet and a 120v outlet with a 20 amp breaker. I called a repair shop and they ...
James Austin's user avatar
0 votes
0 answers
32 views

240V on all 120v outlets and ceilings lights [duplicate]

In a remote studio have a Sub-Pannel with Multimeter readings. With No Circuit Breakers In Place (L1 to N 120v) (L2 to N 120v) (L1 to G 120v) (L2 to G 120v) (L1 to L2 240v) (N to G 0v) slim type ...
Lester Ray's user avatar