Questions tagged [120-240v]

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

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1answer
56 views

Adding 240v (NEMA 14-50) outlet right behind breaker panel

The breaker panel is on the outside wall, right next to my garage. I want to install a 240v outlet right behind the panel, thru the wall. If i open the panel, there are those round metal covers that ...
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2answers
97 views

Connecting 120/240 receptacles on the same circuit breaker

I want to add a branch circuit to the control panel using 12/3 wire and protected by 20 amp double pole circuit breaker. Is it safe to connect multiple duplex receptacles 120 volts and 240 volts on ...
6
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2answers
1k views

Electrical service sizing mix up in Mexico

Facts: The national electrical supply company of Mexico called "Comisión Federal de Electricidad" (CFE) oficially instructs users to install: A two pole one trip main interrupt behind the service ...
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2answers
153 views

Future proofing for 240V outlet

I currently have a 12A EVSE that takes either 120V or 240V and uses a normal three-prong (NEMA 5-15) plug. I am looking to install a 240V outlet on a 50A circuit breaker to use with this EVSE, but I'm ...
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2answers
77 views

Replace 240 receptacle with one or two 120

I found some similar questions but given possibly different base assumptions I would like just to check that what I want to do is possible with existing wiring. In NYC, where everything is armored ...
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1answer
23 views

220v, gfci and amps

i am a home brewer and have recently purchased a 200v 30amp brewing pot (NEMA 6-30p). I have a 220v 50amp rv receptacle (NEMA 14-50r) with a 50A GFCI double-pole breaker in the main house panel. I ...
3
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1answer
62 views

Can I draw 240v out of this configuration?

This is how my subpanel looks like. I am looking to install a breaker for an AC unit. 20A. The only caveat is that this has to be 240V. This is a subpanel coming from the main one. There is a breaker ...
1
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1answer
36 views

Two Poles Three Black Wires and One White - Convert to 120 V Outlets

I have a two pole breaker with three black wires and one white wire. The breaker is 50 amps. The three black wires are labeled "Load Power", and the white wire is labeled "Neutral". Where an outlet ...
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3answers
50 views

3 wire 240 double pole breaker to. 110v single pole breaker

I have 3 wire ( black, white,green) 240 on a double pole breaker. White and black wire connected to breaker green to neutral bar. Want to convert to 120v single pole breaker. Which wire do I connect ...
0
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1answer
37 views

Add 120 volt outlet to a 240 volt disconnect

I have a 240 volt breaker in my main breaker panel feeding a local outdoor disconnect (black, white, red & ground) for an outdoor sauna. Can I take leads off the black, white & groun, before ...
15
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3answers
7k views

Can I use 220 V outlets on a 15 ampere breaker and wire it up as 110 V?

I purchased a 220 V outlet and didn't realize it. My circuit is 15 amperes. I wanted to hook up a series of normal 15 ampere 110 V outlets. When I look at the outlet it looks exactly like a regular 15 ...
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4answers
2k views

Why does my electric oven present the option of 40A and 50A breakers?

The oven in question states 40A with 120/240 volts. In the installation manual: This range is manufactured with the neutral terminal connected to the cabinet. Use a 3-wire, UL Listed. 40- or 50-...
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1answer
43 views

240 volt not supplying 120 over one leg and the neutral

I've got a 4 wire 240 volt receptacle set up to power an electric brewing controller. There is a 240 30amp breaker in my main panel that then supplies a sun panel in the garage that has a 30amp gfci ...
3
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2answers
262 views

Multi wire circuit or 2 separate 120V 20A dedicated circuits?

I'm planning to purchase a portable indoor infrared sauna and locate it outdoors under my deck. The sauna will require a dedicated 120V 20A outlet. I'm wondering if it makes sense to install a multi-...
2
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2answers
629 views

Can a sub-panel have a larger main breaker than the feeder breaker in the main panel?

I have a weird setup that I'm trying to configure, but I'm only 90% certain of my logic (and with electrical items I want to be 100%). I have a new 400A meter/main combo unit with 1 built-in (...
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2answers
65 views

Does anyone know how to split the 240 V wire components of a dryer from the 120 V?

We are living on an island where the electrical grid is already 240V. We shipped a US dryer here and are trying to figure out how to wire it properly (me and local electricians). From my research ...
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3answers
197 views

When splitting a 240v circuit, what happens to neutral's amperage?

My garage has very limited power with only one outlet that I share with 3 bathrooms and every outdoor outlet, 4 total, on a 20 amp breaker. (House hastily thrown together in 97' for your reference) I ...
0
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1answer
231 views

Powering 220V-to-neutral appliance from 120V split-phase?

I have a 5kW appliance that normally accepts 3-phase power, but can also run on 220V. The manufacturer indicates that when running on single-phase 220V, to connect 220V hot to all three input phases ...
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2answers
2k views

Why can't I (or: shouldn't I) run a power cord through a wall?

I would like to wall-mount my TV and have the wall be as clean as possible. I found this box and my idea was to mount this on the back side of that same wall , then run the power cable (and other ...
0
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1answer
860 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?
16
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4answers
6k 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 ...
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1answer
98 views

How to get 110 from 240

We currently have 240 high bay metal halide lights in our gym we bought 110 led high bay lights to replace them ( new fixtures) can i not just remove one leg of the 240 in the breaker box and move it ...
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5answers
2k views

Does running a dryer on 120 V drive up electricity costs?

So I have a ventless dryer, and it's a relatively new LG model (LG DLEC855W 4.2 cu. ft. Compact Electric Dryer) that I have hooked up to a 120 V outlet. I know it's not supposed to run on a 120&...
2
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1answer
326 views

120/240 Multi wire branch circuit - failed inspection because of uneven loads?

From a double pole 20-amp breaker, I ran 12/3 w/g to a quad box with a 120 receptacle and a 240 receptacle. Red wire from one pole of the breaker to the 240, ground to the grounds, white to neutral ...
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2answers
113 views

Replace electric water heater with gas tankless (electrical connection)

I want to replace my electric water heater with a gas tankless water heater. My current water heater like most electric hot water heaters takes 220 and the tankless gas water heater uses 120. The room ...
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1answer
67 views

How to connect 5-15P plug into 6-20R receptacle?

I have a computer power supply (PSU), input voltage is 120-240V, I assume I can safely plug it into a 240V outlet. I have one those outlets in my garage, problem is that it is 6-20R type receptable ...
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0answers
62 views

120/240 circuit extension

I have a 3-wire 120/240 V circuit running to my garage to an l14-30 outlet for an arc welder. Occasionally I want to run that arc welder in my basement. My thought is to cut the existing circuit in ...
0
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2answers
538 views

Does the metal receptacle box for 6-30 NEMA need to be grounded?

I have a 240 VAC portable heater with a 6-30 NEMA-style plug. I am finishing the 3rd floor of our house. I installed a sub panel fed with a 50A service using 6 AWG THHN. Installed a 30-amp 2-pole ...
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2answers
988 views

Can I add a 120v branch for a washer to a 240v dryer circuit?

I’m running 10-3 Romex for a 240v electric dryer in our garage. It would be very convenient to tap into one hot leg and add a 120v outlet for the washer (they will be stacked). Is this allowed per NEC ...
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2answers
101 views

Wiring for 120 now with 240 option later?

I want to wire a dedicated plugin to the front of my garage for a new EV, which at the moment needs to be 120. But later, I may upgrade to a 240 based charger. Is there a suggested way I could wire ...
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2answers
58 views

Can I use a USA GFCI Intex Pool pump in New Zealand

I have imported an Intex salt system for use on a locally purchased intex pool. when I received it , the plug is a GFCI plug with a test and reset button on it. the pump is a 230w pump. I purchased a ...
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2answers
314 views

I have a 120/240 dryer from Canada, and want to use it in a 240v country.

The dryer electric driagram identifies a RED L1 wire, a WHITE LN one, and other Black as L2. The suplpy cord has a RED, WHITE and BLACK wires and the green ground as well. How should I connect the ...
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2answers
2k views

Getting 120v single phase & 240v three phase out of 240v single phase receptical

Will the following wiring diagram work? This 240v single phase NEMA L14-30R receptacle is right off the main panel with a 30amp breaker. I want to obtain both 120v single phase and 240v three phase ...
0
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2answers
7k views

Can I convert a 240v plug serving a stacked washer/dryer to 120v plug to serve the washer only?

I have a stackable washer dryer combo with one 240V plug. The dryer works on 240V and the washer works 120V, but they have 1 control panel. The dryer died and the room only has one 120v and one 240v ...
1
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1answer
76 views

Added a celing fan in bedroom, need to wire for switch

I recently added a box to install a ceiling fan in our bedroom. We want to convert the single switch in the bedroom to a dual switch. The single switch thats currently in, turns on power to the top ...
0
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3answers
166 views

Can my house's electricity supply be upgraded?

I'm trying to start a business in my house: Cryptomining. Essentially, I will be buying many big power-hungry computers which will print money out of thin air. It's a very lucrative business. Right ...
1
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1answer
581 views

Control 12V LED circuit and 120V power supply from one switch

I want to have two switches (preferably in the same box) that control two separate runs of LED lights, both powered by a single Allanson power supply: I plan to switch the lights by breaking the 12V ...
2
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3answers
796 views

Is a 240v solar panel setup better than 120v?

I am considering a small 1kW solar system (4x 250-watt panels). The seller offers them in both 120v and 240v configurations with "micro-inverters". Given a 25-year panel warranty, could the amperage ...
1
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3answers
2k views

Powering a 240V 15A air compressor with a 6-20 plug

I have an air compressor with a 240V 15A power requirement and a 6-20 plug (looks like normal US plug but with one of the flat ends turned at a 90 degree angle). Instruction manual can be found [here][...
4
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2answers
846 views

Can I add 240v 40A circuit to my breaker box to power an electric range?

This is my breaker box; I'm concerned about not having enough space to accommodate an electric range which requires 240v 40A. My box has tandem circuits, although I'm not sure if consolidating ...
19
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2answers
5k views

What is a tandem breaker (aka duplex, cheater, twin, double-stuff, etc.)?

I keep hearing about tandem breakers, and how they won't work with 240V loads and how they should never be used for a multi-wire branch circuit. Aside from those issues... What is a tandem breaker? ...
2
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1answer
101 views

Outlets (top only) and lights wired together with trail wire not working

I have a room in my house where the top of each outlet is controlled by a switch, and all of the ceiling lights by another switch. I thought I could just bypass the switch for the outlets and have ...
1
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5answers
11k 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 ...
4
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1answer
4k views

Why would a 120v circuit work without a neutral?

My home has a relatively typical (in America) 100 amp 240v feed accomplished via three conductors - two 120v "hot" wires and one neutral. This gives me my 240v circuits (the two hots) and my 120v ...
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2answers
2k views

Is it possible to adapt a NEMA 14-50R to a NEMA 6-20P or NEMA 6-30P appliance?

In a Canadian residential kitchen, in a house built in the late 1970's, there is a NEMA 14-50R, on a 30 Amp breaker. Currently a standard oven/range combo is plugged into this receptacle. I would ...
0
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3answers
284 views

Can I safely create another 120V outlet using the fourth neutral wire from a 4 wire 240V line?

I recently just ran a 4 conductor 240 volt line out to my shed. I chose to run the extra conductor just in case, but I do not currently need it for my application. My question is, can I add a 120V ...
2
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3answers
4k views

Explain voltage readings on NEMA 10-30 socket

The clothes dryer in the garage is plugged into what appears to be a NEMA 10-30 socket (receptacle). Reading the voltages on the socket with a multimeter, the voltage between the two diagonal blades ...
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1answer
3k views

Converting appliances from 120v -> 240v

I've been getting U.S. appliances sent to E.U. where the voltage is doubled. I'm using autotransformers so they can work, but this isn't ideal. I do this to save money. EU retailers add their ...
5
votes
3answers
5k views

What is the explicit difference between the ground and neutral wire in 110V systems?

So, I've put in or replaced several outlets following wiring instructions online and in the box. Nothing big. I know that if I fail to turn off the breaker then I shouldn't directly touch the black ...
4
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3answers
2k views

Why is it said that a typical 120V household circuit “reverses” polarity?

Responders have been very helpful with a recent post of mine. But I'm sorry to say this part still perplexes me: In a 120VAC circuit, current flows from Line 1 through the load, and returns via ...