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Questions tagged [240v]

For questions dealing with 240 volt electrical circuits, devices, and equipment. This tag covers the similar voltages as well (i.e. 220, 230, etc), since they generally refer to the same thing. Use with the [electrical] tag.

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44 votes
8 answers
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Why Do 240V Circuits Not Require Neutral?

Someone told me that a 240V circuit does not require a neutral wire in the cable. Can anyone explain this phenomenon from the electricity perspective and generally explain why circuits do and do not ...
amphibient's user avatar
  • 7,525
33 votes
8 answers
52k views

Why am I getting an electric shock from the water in my hot tub?

I have noticed that when I touch the water of my Hot Tub when I am grounded (barefoot standing outside of tub) I am getting a very small electric shock. Using a multimeter it is reading 2Vac between ...
Lee's user avatar
  • 589
24 votes
1 answer
7k views

240v Outlet with 120v and 215v - How?

Ok this is a weird one and maybe I just don't understand how mains work (though I feel I have a good enough knowledge to stay safe and do basic breaker work & wiring). Buddy moved into a new shop ...
Skinner927's user avatar
18 votes
3 answers
7k views

240 V dryer outlet is reading 245 V

My 30 A dryer outlet reads 122 and 123 V on my multimeter (a total of 245 V). Will this be a problem for a new modern dryer if it is higher than 240 V? It is a three prong outlet.
user129694's user avatar
17 votes
4 answers
16k views

240 V outlet is not delivering 240 V

I recently moved into an apartment with a 3-prong, NEMA 10-30 outlet. It looks like this: I bought an old dryer that I confirmed was working before purchasing it and hooked it up and unfortunately ...
Clicquot the Dog's user avatar
16 votes
2 answers
6k views

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

I bought a cooktop which has 3 wires: Black Red Green The wiring in my home is 4 wires: Black Red White Bare I saw the instruction for 3-wire to 4-wire connection, it states to leave the white ...
movila's user avatar
  • 273
15 votes
2 answers
46k views

Splitting a 240V line into two 120V lines

In my garage I have wiring for a 240V outlet. It is a four-wire setup (two hots, one neutral and one ground). It is set up on a 20 ampere double breaker in the circuit breaker box. I want to remove ...
Kevin Bright's user avatar
14 votes
3 answers
4k views

Should my 240v electric stove be grounded to the neutral like this?

I have an induction cooktop/stove in a California condo built in 2011-2012. Recently, I had to pull the cooktop electrical and discovered that the stove has a 3 wire harness (red, black, yellow/green)....
James's user avatar
  • 357
13 votes
6 answers
6k views

Need to reduce voltage from 245v to under 240v for large printer

I run a home business and have recently purchased a large HP 800w latex printer that requires a 220v outlet. The manufacturer of the printer requires there to be no more than 240v going into the ...
Rodney's user avatar
  • 139
13 votes
4 answers
81k views

Confusion over 220 and 230 volt outlets

We have a 220 outlet for our A/C. We are shopping for a new unit and all I am see is 230 volts on the units. Will we have to rewire with a new outlet for a new A/C?
Shelia Abshire's user avatar
13 votes
4 answers
43k views

Is it safe to use two single-pole breakers for a 240 V circuit?

I recently had an electrician come out and replace my electric panel. He seemed very knowledgeable and overall appears to have done a good job, even went through and labelled most of the panel... ...
schizoid04's user avatar
12 votes
2 answers
5k views

I’m trying to make a 220V power cord

My plasma cutter has a 3 prong 220V power cord. I want to make an extension cable that I can plug into my dryer's 4 prong 220V outlet. I have a 3 prong receptacle to put on the other end of my cord ...
Matt T.'s user avatar
  • 139
12 votes
2 answers
192k views

What's the difference between three phase 240 V and standard household 240 V?

I don't understand the difference between household 240 and 3 phase 240. Isn't household 240 just two 120 phases, making 240V two-phase? If so, wouldn't three phase just be 360v? How, then, is there ...
kewltek's user avatar
  • 135
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
11 votes
3 answers
390k views

What wire gauge should I use with a 30 amp breaker for a 220V welder?

I am installing an outlet in my garage for a 220v mig welder. The welder specs call for 30A breaker. The outlet for the welder is only 2 feet from the garage sub panel. The wiring refernece charts I'...
Scott Bruns's user avatar
  • 1,936
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
  • 761
10 votes
4 answers
17k 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, ...
ScotBirmingham's user avatar
10 votes
1 answer
154k views

Why did my electric range wiring burn out at the terminal block?

Turned on our 2 year old stove (Whirlpool Gold) and heard fizzing noises, then smelled electrical burning. Went downstairs and shut off the breaker (40 amp). That was the only way to get it to stop "...
Dean's user avatar
  • 101
10 votes
1 answer
2k views

Can I install and safely use a British 220V outlet on a US 220V split-phase circuit?

I have a British tea kettle I like very much. I have space in a subpanel in my kitchen for a 220V 15A circuit. If I purchased a British receptacle and wired it across the 2 hot wires, rather than the ...
bongo fury'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
  • 107
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
9 votes
3 answers
2k views

Can I change the plug on this 240 V device?

(In the US, Ohio): We had our electric to our home professionally redone a couple years ago, so that we could hook up a kiln in the garage. This all works great. We recently got another smaller kiln,...
MikeJansen's user avatar
9 votes
3 answers
3k views

Is this 240v circuit to garage for electric charger good or did I miss something?

I'm adding a circuit to my garage for an EV charger. Yes, I have pulled a permit. I live in Massachusetts. Here's my plan: I'll be adding a new 60 amp GFCI breaker to the panel. Yes, there is space in ...
holmeski's user avatar
  • 195
9 votes
3 answers
4k views

Splitting 240V into two 120V Circuits

I think I have this figured out for the most part but looking for validation from expert strangers on the internet. Renovated the kitchen in this 1960's house. I think it probably has been renovated ...
Tyler Herron's user avatar
9 votes
3 answers
12k views

What are my options for installing 240v receptacles in an attached garage?

My workshop (attached garage) is currently wired with 120V receptacles fed from the main panel in the house by #10/3 with ground (1 black, 1 red, 1 white, 1 ground) attached to a double-pole 30A ...
Michael's user avatar
  • 411
8 votes
4 answers
7k views

A 240V heater is wired w/ 2 hots and no neutral. What should the voltage between two hots read?

How come I am reading 120 between each hot and ground and 0 between 2 hots. What is this an indication of? Thanks! (i'm in USA)
user2811449's user avatar
8 votes
4 answers
2k views

Alternative GFCI Wiring in Strict 240V Scenario?

I have a strict 240V wiring situation (i.e., two hots + ground, no neutral) with a hot tub as the only load on the circuit. Now, I think it’s very prudent (and generally mandated) to have a local ...
DIYnot's user avatar
  • 81
8 votes
4 answers
38k views

How can I switch between two 240V 30A loads?

I've got a situation where I have a 240V 30A dryer line, and I want to power something else from the same circuit, but NEVER at the same time as the dryer. I'm looking for a switch to use, like a DPDT ...
DPS's user avatar
  • 123
8 votes
1 answer
30k views

Installing a new 240v receptacle - what do I need to know?

Provided I use a box large enough to meet the fill requirements (and use 10 AWG conductors), are there any additional requirements I should be aware of when installing a new 240v 30 amp receptacle for ...
Wilco's user avatar
  • 635
7 votes
3 answers
1k views

What purpose does a 3+1 outlet/circuit provide when the neutral bus is grounded?

I'm trying to wrap my head around what the benefit is of having to use a 4-prong outlet for newer appliances when it appears the neutral and ground both end up in the same spot. In a dual pole ...
DA01's user avatar
  • 24.4k
7 votes
2 answers
14k views

Using Only 3 out of 4 wires on 220 wire run

I have equipment that has 3 wires (red, black, green) The wire run from the breaker box is 10-3 (red, black, green, white) The equipment requires 220/240v. I'm just wondering if it's OK to leave the ...
WP.'s user avatar
  • 71
7 votes
5 answers
5k views

Two-phase/3-phase cooker connections in the Netherlands

I need to replace an induction hob that has been broken with another of the same model (IKEA Matmässig, just for sake of completeness). Original connection options The original connection to the mains ...
Daniele Procida's user avatar
7 votes
1 answer
2k views

How important is a grounded stove outlet?

Apologies if covered elsewhere... My place has the old-style three-prong 240V stove outlet, two phases plus neutral. This means the stove (recent, induction) doesn't have a safety ground. The closest ...
keshlam's user avatar
  • 31.1k
7 votes
2 answers
2k views

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
7 votes
4 answers
8k views

How do I wire a modern 240V 3 prong range to a 250V 50A 3 prong outlet?

This is for wiring in the United States. My wife ordered a new GE electric range top, and it came with a 3 wire flex conduit permanently attached. I cannot change it. It has a black wire, a red wire ...
Jimmy's user avatar
  • 267
7 votes
3 answers
6k views

How should I go about fixing a faulty 240 V Electrical Outlet

This afternoon, my wife and I noticed a peculiar smell coming from the garage. We localized it to a faulty 3-wire 240 V outlet. Something got really hot resulting in part of the rubber melting on ...
Mike B's user avatar
  • 8,133
6 votes
5 answers
11k views

240 Volts - No Neutral Required - How does Power Return to Earth?

I think this question is appropriate here in order to help DIYers (me) to understand why a neutral isn't needed on a 240 volt outlet. I understand that two 120 volt power sources that are 180 degrees ...
HoneyDo's user avatar
  • 8,806
6 votes
3 answers
11k views

When do I need a neutral on a 240V branch circuit?

I'm installing a 240V outlet in my shop to run a welder and I'm trying to understand when a neutral is needed and when it's not. The welder has a NEMA 6-50P plug, so I don't need to run a neutral ...
tnknepp's user avatar
  • 1,396
6 votes
7 answers
144k views

Can I share a 240V outlet between two devices?

I have a single 50 amp 240 volt outlet. However, I've been using both my dryer and a welder on this same outlet, both have 3-prong (10-50P) plugs. It can be difficult to plug and unplug cords from ...
Benzo's user avatar
  • 223
6 votes
2 answers
4k views

Swapping L15-30 with L21-30

I have some plugs in my warehouse that have L15-30 receptacles. Inside the boxes are four wires: Orange, Black, Red, and Green. I would like to swap one to an L21-30 receptacle. It looks like the main ...
Neil's user avatar
  • 75
6 votes
4 answers
8k views

EV charger wiring - sub-panel requirements

I am looking to add a 30A outlet in my garage for the purpose of charging an EV. My home has 200A service coming through the main panel, and currently there are no sub-panels except one for the ...
KM001's user avatar
  • 61
6 votes
1 answer
5k views

Using 10/2 and/or 8/2 for a 240 only 3-prong

I have 2 dedicated circuits: 40 amp water heater 30 amp electric range Both have 2 hots and a neutral grounded at the panel. One runs through a junction box where the wires are connected and ...
Laramie's user avatar
  • 435
6 votes
5 answers
34k views

Hot Tub Disconnect Location

I have a concrete slab which can fit a hot tub approximately at a distance of 8 feet from the main breaker panel (located outside on my porch). I assume that I will still need a separate disconnect ...
Phil B's user avatar
  • 61
5 votes
2 answers
40k views

Replacing 240V outlet with 120V

I just moved into a new home, and we have an outlet in the bathroom that was set up for a washer/dryer in case we wanted to go that route. The outlet is a NEMA 10-30R. We are happy with the dryer ...
dberm22's user avatar
  • 434
5 votes
2 answers
1k views

Need advice on how to install 240V outlet for greenhouse heater

Update Based on many inputs a much better solution is the heat pump. Big thanks to Harper and manassehkatz for the help, both answers are great and very helpful. Original Post Long story short, my dad ...
Spooked Husky's user avatar
5 votes
1 answer
9k views

Can I use a 60amp AC disconnect box for a 30amp circuit?

Can I use a 60amp 240v AC service quick disconnect box, despite my romex, circuit-breaker, and AC unit being merely 30amp 240v? I'm getting ready for a AC tech to install a split unit AC, and am ...
Jamin Grey's user avatar
5 votes
2 answers
1k views

Do I have room to add a 240V breaker in my panel?

I’m trying to see if I have room to add a 240V line for a mini split. The mini split I got is a Gree with nominal 9 amp pull and manufacturer recommended breaker size of 20 amps. Any thoughts on an ...
Chris's user avatar
  • 53
5 votes
3 answers
7k views

Replacing old plug-in 220V range with new hardwire 3-wire electric cooktop: remove outlet or add a plug?

My apartment had an electric range which plugged into NEMA 10-30P/10-50P and was served by two 50A circuits. I will be installing electric/220V induction cooktop using the same circuits. There are ...
Asya Kamsky's user avatar
5 votes
4 answers
3k views

Whirlpool electric dryer works on 120 but not 240

I am trying to fix my dryer but I have run into a problem I can't find the answer to. I checked all the fuses with my multi meter and everything seems to be working. Before I rewired a slot in my ...
bosestron's user avatar
5 votes
4 answers
1k views

Using a countdown timer to control a 40A 240V contactor

It seems there are a couple ways to do this, but I haven't seen the exact solution I'm looking at so I wanted to check with the community on this. I have a 4KW patio heater I'd like to control with a ...
ABethea's user avatar
  • 51

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