For questions dealing with 240 Volt electrical circuits, devices, and equipment.

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11
votes
7answers
72k views

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 ...
8
votes
3answers
2k 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 ...
8
votes
1answer
125k 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 ...
7
votes
3answers
3k 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 ...
7
votes
1answer
32k 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 ...
5
votes
2answers
2k 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 ...
5
votes
2answers
8k 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 ...
5
votes
5answers
146 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 ...
4
votes
4answers
37k 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 ...
4
votes
4answers
17k views

Can I upgrade from a 240V 30A circuit to a 240V 50A circuit?

I have a new range with a NEMA 14-50P plug. I find my 240V receptacle is for a dryer, with the top blade a 90° one. So I need to change the receptacle out. However, I think my range needs 50 Amps, and ...
4
votes
2answers
1k 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 ...
4
votes
2answers
886 views

How is ground wire handled on 240V outlet?

I'm in the process of moving 240V outlet. The outlet has three wires connected. See the image: In the junction box I can see the ground coming out of the outlet. See the image: So where is the ...
4
votes
1answer
248 views

Can I wire a secondary 240V breaker box for lab equipment from Europe?

I have a dental lab in Europe and might want to move it to the USA. Some of the equipment rates as high as 4kW, and the the total maximum draw is 15kW for the whole lab. Can I wire a secondary breaker ...
4
votes
1answer
1k views

How do I wire this 30A 250V straight blade pass and seymour receptacle?

This is the receptacle I'm trying to wire. The ground says green next to it, but the other two wire inputs don't say anything. I need to know which is positive and negative. there is no + or - the ...
4
votes
4answers
6k views

How can I upgrade a 3 wire appliance receptacle to a 4 wire receptacle?

I have a cabin, wired for 220 and even has a sub-breaker near the outlet. There are 3 wires to the connector (two hots and the neutral). The range-top that I want to hook up is a 4-wire model (2 ...
4
votes
1answer
264 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 ...
3
votes
3answers
547 views

Is it possible that I could have a 240V circuit with no circuit breaker?

Is it possible to put in an electrical circuit without any way to interrupt the circuit? I tried to work on a 240V outlet, and it wasn't marked in the breaker box. I threw every breaker, and that ...
3
votes
5answers
129 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 ...
3
votes
1answer
28k 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 ...
3
votes
3answers
361 views

Connecting the four terminals of a 14-50P to a homebrew 240v system with three wires

I bought a new 240v homebrew system. The system requires a 30 amp circuit and comes with 10 gauge wires (black, white, green) but no plug (so you can connect the plug needed for your situation). I ...
3
votes
4answers
166 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 ...
3
votes
1answer
92 views

How to connect single-phase appliance to 240v feed?

I had a licensed electrician install this circuit with NEMA 14-30 receptacle before I knew which specific appliance would be used on the circuit. I now have the appliance with a 14-30 plug, but it ...
3
votes
1answer
407 views

How difficult would it be to replace these fuses with circuit breakers?

I had a fuse blow last night. While the short-term plan is just to replace the fuse wire, in the longer term I'd like to switch them out for circuit breakers for the added safety but mostly for the ...
3
votes
2answers
426 views

How do I wire this 240v fan motor and thermostat

I'm trying to wire a two stage exhaust fan for my greenhouse. The motor comes set up for 240v wiring and is to be controlled by a thermostat. I undertsand how to get the 240v from the panel, but can't ...
3
votes
2answers
4k views

Trying to wire a 240v line-voltage thermostat

I am trying to replace my old 240v line-voltage thermostat with a modern version. The problem is that after wiring the new version in like the old it doesn't work. I have (2) 12-2 wires coming out of ...
2
votes
3answers
382 views

Why can't I measure 240V on this wall heater wiring?

I am replacing a 240V wall heater. I get 120V from black to ground but 0V from black to white and 0V from ground to white. Is this correct? The old heater worked but not really well. There was a ...
2
votes
1answer
550 views

Why am I getting 60V between the leads of my dryer and the ground?

trouble shooting my dryer, i get 240 across the leads, and 120 from either lead to the neutral... but only 60 from either lead to the ground. is this normal?
2
votes
1answer
1k views

Which cable/conduit should I use to run a new 240 volt line for an oven?

I'm in the middle of a kitchen remodel and have hit a slight snag and need some advice on how to proceed. I'm moving the oven into an island, which requires moving the 240 line used for the oven. The ...
2
votes
1answer
307 views

Why must I hold the start button for my dryer to work?

I moved into an apartment with an old dryer that had issues starting and getting the clothes very hot. I had to hold the start button in and the dryer would "ramp up" before it would start. Anyway, I ...
1
vote
2answers
1k views

Jury-Rigged Modification of 120v Circuit to 240v Circuit Using Steel-Armor of BX Cable as Neutral/Ground… [closed]

My house was constructed in 1980 in the City of New York. About twenty-five years ago, I installed a new 29,200 BTU Carrier A/C through the wall of the house. The unit was rated at 208v, drawing ...
1
vote
7answers
5k 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 ...
1
vote
2answers
8k views

How do i know if my service panel will accommodate a 240v circuit breaker

We are looking to install a hot tub and trying to find out if our service panel will accommodate a 240v circuit breaker. This is what our panel says but I do not know what all of this means: ...
1
vote
2answers
491 views

240v outlet not delivering 240 volts

To spare you all the long version of my two week nightmare: bought a house built in 1976. Hooked up dryer, switched to 3 prong plug. Dryer ran fine, started to smell like burning plastic until it ...
1
vote
3answers
1k views

2 15 amp breakers to 1 30 amp

I have a wired garage that has 3 wire 10 gauge going in to it. In the panel this wire is hooked up to 2 individual 15 amp breakers. I want to know if i can put in a 30 amp breaker in that spot. The ...
1
vote
2answers
5k views

How should I install a thermostat for a baseboard heater?

How would I go about installing a thermostat for my bedroom's baseboard heater? I've seen lots of articles on how to replace an old thermostat but I'm installing a thermostat for the first time here. ...
1
vote
1answer
1k views

How can I make a 240 volt 4 wire to 3 wire extension/adapter cord?

I have an existing 240 outlet wired into the wall of my shop. It's there to run a phase converter that I use about 2 hours a week. I want to use this circuit to run a 240 window air conditioner when ...
1
vote
1answer
114 views

240V power plug, only getting 120v, and 97v?

This is the plug/socket: Between one line and neutral, I get 120v. Between the other line and neutral, I get nothing. However, when I go between the line and the line, I get 97 volts. (I'm testing ...
1
vote
2answers
98 views

Changing 240V plug type

I have a device (a popcorn popper) that has an L14-20P plug. I would like to use it with my stove's 14-50R receptacle. Since the device is rated for 20 Amp, and the receptacle for 50, this should be ...
1
vote
1answer
273 views

Can I power a separate cooktop and wall oven from a single circuit?

I am replacing my 240V electric cooking range with a glass cooktop (with 4 heating plates) and a separate wall oven. The old cooking range was a plug-in. The two new appliances (the glass cooktop ...
1
vote
1answer
83 views

How can I tell if there's an electrical issue or if I have a bad dryer?

I purchased a dryer from Sears: recently, which didn't work upon being connected. I performed a couple electrical checks (more on that in a moment), then called them up and told them that it was dead ...
1
vote
1answer
57 views

How many electrical circuits? [closed]

Considering the following appliances, how many separate circuits should I consider for an apartment with 1 bedroom, 1 living room, 1 kitchen, 1 bathroom, and 1 access hallway? electrical oven ...
1
vote
1answer
125 views

Sauna tripping GFCI

I've just finished up wiring an old heater in my sauna. It has laid around in a shed for a decade or so and am wondering if it's spent. It powered on fine and heated for about 5 minutes until the GFCI ...
1
vote
0answers
117 views

Clothes Dryer electrical 240v between hot and netural, 0 between other hot and neutral

I had to move around my dryer to do some work in my laundry room. When I plugged it back in, it wouldn't turn on at all. None of the buttons would even make the lights come on. I unscrewed the end ...
1
vote
0answers
37 views

What do I need to do to have the 240v system activate an indicator light only when the pump is activated?

I have a spring run-off. I have 1 effluent pump 240v with piggy-back float switch as primary pump I have 1 effluent pump 115v with piggy-back float switch as secondary pump set to higher level to ...
1
vote
0answers
125 views

What could happen if a 240 stove cord was improperly installed and then stove was plugged in to the receptacle?

I think my new stove cord was installed incorrectly — after being plugged in we heard a ((whooooaamp)) sound and all the lights in the house flickered, now none of my 220 appliances will work ...
0
votes
3answers
56 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 ...
0
votes
2answers
50 views

GFCI pops when the heater comes on

Just wired a new heater like this and the GFCI pops when the heater comes on. Can someone explain to me why this is happening?
0
votes
1answer
150 views

How can I tell if two outlets are on different phases?

I have a house that had a 240v stove in it, and then was replaced with a gas stove, all before I bought it. There are two regular 120v outlets under it, that are both 120v, and the gas stove is ...
0
votes
1answer
105 views

Starting to build up my tools collection, is 110v preferable over 240v?

I am just starting out on my first major project this weekend and I am looking at getting some new tools. I've had experience using plenty of 240v power tools, but now that I am looking at getting my ...
0
votes
2answers
47 views

240 outlet giving abnormal me abnormal readings

I just moved to a new house and was troubleshooting a dryer when I noticed my outlet is giving me incorrect voltage. I know I should have two hots (A and B) on either side, a ground at the top (C) and ...