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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
  • 7,513
7 votes
4 answers
37k 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
  • 113
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
10 votes
1 answer
153k 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
4 votes
2 answers
3k views

How should I secure an unused wire in my breaker panel?

I accidentally pulled 6-4 wiring to a machine that only needs 240 and no neutral. What to do with the white wire? I read here that at the machine, I just cap the white wire. When I go to connect the ...
Josh's user avatar
  • 143
4 votes
1 answer
12k views

Do both legs in 220V have to be switched?

I posted this question but for some reason I can't get back into my account: Is it up to code to do a parallel circut with 220V? Is there a limit to number of splices? Most things I see with 220V ...
user65264's user avatar
3 votes
1 answer
209 views

Is it possible to add a retorfit ground wire to a (3-wire) Type SE, Style U cable from another branch?

Would it be possible to add #10AWG GROUND from another branch (hot-water heater 30A circuit) in order to retrofit ground and replace a 3-wire receptacle with a 4-wire one to be able to use it for an ...
Matt's user avatar
  • 193
2 votes
2 answers
9k views

How can I convert a 240V dryer outlet to two branch circuits?

I'm converting a former laundry area into a bar/coffee area. There's a relatively new 240V, 40A circuit that is now unused, so I'd like to repurpose it for 120V service. I'm hoping to run 1/2 of it ...
richardtallent's user avatar
15 votes
2 answers
45k 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
12 votes
2 answers
191k 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
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
  • 1,376
4 votes
4 answers
31k views

Discovered 10/2 wired 3-prong receptacle for dryer. Is it ok to leave as is?

We removed a drop ceiling in our 2nd bathroom and discovered that some previous homeowner/DIYer had run wiring for a new dryer through the drywall ceiling into the wall, and hid it with the drop ...
Benjamin Hodge's user avatar
4 votes
2 answers
2k views

Where are the two pole CAFCI/GFCI breakers?

Why aren't there very many (any?) two pole dual function breakers? Is a GFCI + CAFCI breaker less useful for 220 or MWBC? Is it be prohibitively expensive? Or is there no demand because not many want ...
Matt Thomas's user avatar
3 votes
4 answers
11k views

Looking for or adding a ground to an existing NEMA 10-30 socket

I have an unused older 3-wire dryer socket (NEMA 10-30R) in my garage, I would like to upgrade this to a NEMA 14-30 socket with an separate ground. I'll be using this for an EVSE unit for electrical ...
kbyrd's user avatar
  • 349
2 votes
2 answers
5k views

How can I control a 240V heater from a pushbutton timer switch?

I am installing a new in-wall bathroom heater (240V - 6.7A). I want to put the heater on a timer rather than a thermostat. This will keep people from cranking the thermostat WAY up and leaving it that ...
Jim McBee's user avatar
0 votes
1 answer
22k views

Running a 50amp 240V line 300 feet to a shed

I'm looking to run a 50 amp 240v line to a shed 300 feet from my house. I have been looking around and reading a lot. Based on this website for voltage drop I need 4awg, to have a less than 3% drop ...
OFFLINEX's user avatar
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
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
13 votes
4 answers
79k 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
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
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
6 votes
7 answers
143k 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
5 votes
2 answers
22k views

How can I connect a 120V washer to a 240V circuit?

So we got a new washing machine to go in a house built in the late 50s. When the appliance installer came to deliver the appliance, we ran into a snag with connecting the washer...the washer appears ...
Jessica Brown's user avatar
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
  • 424
5 votes
1 answer
446 views

Very unsafe-looking receptacle

While I was searching for duplex receptacles where one was NEMA 5 (120V) and the other was NEMA 6 (240V), I found a few normal ones that were what I was looking for (Leviton 5031, 5842, 5844, Hubbell ...
Joseph Sible-Reinstate Monica's user avatar
4 votes
2 answers
4k views

How can I safely remove an outlet from service?

I have an unwanted 240v outlet in my hallway, on the same circuit as my sewer pump. I pulled the cover and the box is an old work type. I noticed a junction box in this area of my crawlspace, so I ...
Josh Bush's user avatar
  • 657
4 votes
8 answers
36k views

Can a NEMA 6-15 Device be connected to a NEMA 6-20 receptacle?

I have a new -80 deep freezer that calls for NEMA 6-15R receptacle, but the old one it is replacing called for a NEMA 6-20. I note that the plug actually seems to fit in the 6-20, but is there a ...
Atl LED's user avatar
  • 161
3 votes
5 answers
4k views

Need another 240v breaker

I bought a device called Sense to monitor home electrical usage that is installed in your electrical panel. The device needs to be connected to a 240v breaker like this: The problem is that I only ...
minou's user avatar
  • 377
2 votes
0 answers
90 views

Garage outlet causes unrelated outlet's breaker to trip [closed]

When I use the power outlet (240v, 15A) outlet in my garage, it trips the breaker for the power in my home office upstairs. What is also interesting and concerning is that the breaker for the garage ...
garageman490's user avatar
2 votes
2 answers
226 views

Converting 8/3 220VAC oven recptacle to 120V recptacle

Good day! We’re replacing an electric oven/range to a gas oven/range And Adding a 600CFM range hood. The old range is leaving an ungrounded 8/3 NM for me to work with. Now, lazy me wants to ...
Roger Houston 's user avatar
2 votes
2 answers
8k views

How to wire up a 240 V oven?

I recently purchased a Whirlpool WOS51ES4ES electric oven from Home Depot with the intention of installing it myself. Our old oven is gas, so I need to run a new 240 circuit. The oven draws 20A. I ...
rothloup's user avatar
  • 745
2 votes
3 answers
8k views

Adding new 240v 30 amp outlet by tapping into existing NEMA 10-30 outlet box

Here's the situation: House was built in the 1980s. My laundry room has an existing NEMA 10-30 outlet that is not being used since we have a gas dryer. I am thinking about getting an electric car so I'...
Vaughan's user avatar
  • 23
2 votes
0 answers
88 views

How to run retrofit ground wire to a new (4-wire 50A) receptacle?

I will be adding a ground to an existing 3-wire setup in oder to make it safe and code-complaint. Will the new bare Cu ground wire use the same receptacle knockout (bottom) as the Al jacketed 3-wire, ...
Matt's user avatar
  • 193
2 votes
1 answer
1k views

Is THWN wire appropriate for an underground vehicle charging circuit?

We recently purchased a Tesla Model 3 and are planning on adding a 240V NEMA 14-50 outlet in our detached garage to improve charging speeds. Tesla's documentation specifies 6 AWG copper wire with 4 ...
Mason Ticehurst's user avatar
1 vote
1 answer
473 views

Is this 240V outlet undersized?

Garage has 100A service sub-panel from main home. The panel contains a 40A 240V breaker. This connects through a heavy-gauge wire (looks to be same wire as feeding the 100A panel itself) to what I ...
Roberto's user avatar
  • 499
1 vote
7 answers
49k views

How many amps per leg on a 220V circuit?

If the nameplate on a piece of 240VAC equipment says 10.0 Amps, does that mean that the load is 10 amps per leg, or 10 amps total, therefore 5 per leg?
Mike M's user avatar
  • 11
1 vote
5 answers
63k views

240 volt house wiring, 130 volts on one leg and 112 volts on the other?

In my folks old farm house, at the panels main input from outside. L1 is 130v. L2 is 112v. When a load is applied both legs down voltage, allot! Anywhere from 10 to 20v. The wires running from the ...
Darrell Smith's user avatar
1 vote
3 answers
165 views

240v Welding Outlet Right Near Breaker Box [closed]

I have a garage where I want to install a 240V / 50A outlet. The garage is finished with drywall. I want to place the outlet adjacent to the outside breaker box (but inside). Questions: What wires ...
Matt's user avatar
  • 19
1 vote
1 answer
360 views

Help Identify 3-wire SE cable

TRIPLE-E ALLOY TYPE SE CABLE STYLE U TYPE XHHW CDRS 600 for electric range Follow up question: Is the 3 wire a grounded neutral conductor or an equipment grounding conductor?
Matt's user avatar
  • 193
1 vote
2 answers
2k views

Why is my stove is no longer receiving 240V of power?

I have a general understanding of electrical and some know how, but I moved into a place at the beginning of 2021 and 3 days ago I come home and try to preheat the oven and nothing. I tried the broil ...
Anthony Hildebrandt's user avatar
1 vote
1 answer
8k views

Help: Wiring 220V in garage to NEMA 10-30r because MIG welder and air compressor have 10-30p

I've reviewed many articles on this website as they've been referred by my Google searches. But most have been about dryers. I have an older air compressor (240V, 60Hz, 15A, 5hp) and a MIG welder (...
DrMuffn's user avatar
  • 11
1 vote
1 answer
182 views

How does this controller board (and contactors) for Harvia Sauna Stoves regulate the kW that reaches the heating elements?

Is there anyone out there who can tell me how this circuit would in any way regulate the kW that make it to the stoves heating elements? Maybe it is that all regulation of the 240v 1pH dual pole ...
Scott M.'s user avatar
1 vote
2 answers
30k views

What size of wire should be used for a 60A Tesla Wall Connector?

I am in the process of installing a 240v Tesla wall connector on a 60 Amp breaker to draw max 48 amp. Distance from panel to site is approximately 110 feet. I want to go with a cable that has 3 ...
Mike's user avatar
  • 11
1 vote
1 answer
17k views

What Wire Should be Used for a 40A 240V Circuit?

Given a 240V 40A circuit is there an official wire type that should be used? I assume there is a building code standard for this somewhere, but I don't really know where to look. I'd love if I could ...
Jonathan Mee's user avatar
1 vote
2 answers
2k views

Is it up to code to do a parallel circut with 220V? Is there a limit to number of splices?

State is Florida. I am wiring a continuous run non-submersible irrigation well pump. I am using a 30A breaker with #10 THHN in Sch 40 PVC conduit buried 18". I could have gone direct bury but I ...
Sparky8932's user avatar
1 vote
6 answers
23k views

Can I handle-tie two 120V CH breakers for a 240V load?

Due to an ordering error a long time ago, I have too many 30A 1-pole "CH" brand breakers. (these are single breakers, not tandem/double-stuff). As you probably realize, there isn't much call for ...
Harper - Reinstate Monica's user avatar
0 votes
1 answer
840 views

Can we pull 120V off of a 240V line for a hot tub without a separate breaker?

A friend of mine bought a used hot tub. Here's the wiring diagram for a 230V permanent power supply: His electrician installed a single 60A breaker in the subpanel. Our best bet based on the wiring ...
D. Patrick's user avatar
0 votes
1 answer
5k views

How can I convert a 220v lighting circuit to 110v?

My electrician wired a single bulb light fixture with 220vac instead of 110vac.There are two 110 vac wires and the Ground.How can i reduce this to 110vac at the fixture?
Rupert's user avatar
  • 1