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Questions tagged [120-240v]

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

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votes
2answers
56 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 ...
9
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3answers
1k 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 ...
9
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6answers
4k 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 ...
1
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3answers
134 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 ...
10
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5answers
5k 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. ...
1
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1answer
41 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 ...
0
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2answers
50 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 ...
0
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2answers
97 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 ...
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2answers
134 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?
10
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8answers
2k 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 ...
1
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0answers
55 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?
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2answers
147 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 ...
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0answers
32 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 ...
0
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0answers
31 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 ...
4
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3answers
536 views

Electrical Wiring - New Circuits (Added pics)

I have run two 12/2 Romex “Home Runs” to a junction box, each for 120V to Circuits A and B. T-off at the junction box, two 12/2 Romex lines split to one 2-gang box, and two more 12/2 Romex lines split ...
5
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2answers
609 views

In a multiwire branch circuit, can the two hots be connected to the same phase?

This may be an obvious question, but I haven't been able to find a direct answer. I believe I have a MWBC - I have two hot wires connected to two separate circuit breakers, sharing a neutral and ...
0
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1answer
111 views

I have a Champion 120V generator, I want to use it to plug into a preinstalled/wired 240volt split phase outlet

I have a new champion generator, 120volt at 20 to 30amp. The previous home owner had the same unit but 240 volt. The home has a professionally installed system for power backup but has a 4 pin 240 ...
1
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1answer
137 views

Can I run conduit containing 120V wires inside larger conduit for 240V wires?

I was wondering if I could run 120v wires inside in a larger conduit that has higher voltage wires 240v, in a smaller piece of conduit? The reason I ask is that I have a manufactured home and when ...
1
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0answers
52 views

30V on 120 circuit - swapped dishwashers and circuit dropped to 30V

Situation: replaced dishwasher. Turned off the breaker first. The original DW is 100% fine, just doing an upgrade. I did not measure the voltage on the wires. New one - connect to existing wires, ...
0
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3answers
1k views

How much 120 from 240 is too much?

I'm running a double circuit breaker from the house at 40amps with 8ga for both hots, the neutral and the ground out to my shed, which is roughly 20 feet. I've got a sub box in the shed where I want ...
2
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1answer
161 views

Is it possible to wire a 240v outlet so that after I don't need 240v anymore I will have two 120v circuits?

I'm in the US. I will be installing a 240v outdoor outlet for an EVSE (electric car charger). However, in a few years I will have a garage built (elsewhere) and will move the EVSE to the garage, so ...
2
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3answers
829 views

Can I use four-wire cable from the panel to create a two-circuit duplex outlet?

I am planning on adding a server to one of the closets in my house. In order to do that I need to run electrical to the location of the server. For severs they recommend having 2 independent lines of ...
0
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1answer
97 views

RV Pedestal - 20 AMP GFCI & 50 AMP 14-50 in same 2 Gang Box?

I'm installing an RV pedestal at my home. Out-of-the-box pedestals are not available. I'm using a 70 AMP outdoor main lug load center (HOM24L880RBCP), and a quad 2-20A 1P, 1-50A 1P breaker to feed two ...
0
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2answers
128 views

Is this how I add GFCI and Regular Outlet to existing Multi Wire Branch Circuit, 20amp? 12/3 to 12/2 wiring with GFCI

I have a multi wire branch circuit using two 20amp breakers and a single run of 12/3 wire to a single split outlet in our laundry room. The top outlet (black) powers the gas dryer, the bottom outlet ...
8
votes
1answer
434 views

Proper way to modernize 1940's cabin sub-panels

This cabin is located in the United States, and was built in the 1940's. However, it has obviously had various electrical panels added to it after its original construction. I'm starting this new ...
2
votes
2answers
162 views

Dryer 240 to 120 question

I have a 240 volt dryer currently, and I want to change it out for a gas dryer that will utilize 120 volt. Since the circuit is 240 volt 30 amp, I'd like to use the existing 6-8 gauge wire and ...
1
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2answers
2k views

Running 240v circuit to detached garage

I am trying to determine the best way possible to get a 240v outlet to my detached garage approximately 25' from the breaker panel inside the house. I currently have 2 separate feeds to the garage ...
5
votes
1answer
362 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 ...
4
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3answers
2k views

How wasteful is a voltage transformer?

If an appliance that is rated for 220V is used with a 110v-to-220v transformer in a 110v country, or an appliance that is rated for 110V is used with a 220v-to-110v transformer in a 220v country, how ...
15
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5answers
3k views

Should I run 240v for any supported appliances?

I am having my main circuit breaker panel replaced (by a licensed electrician) and he told me I can run new circuits for him to hook up to the new panel. Is there any benefit to running 240v circuits ...
1
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1answer
120 views

Powering a 120v Receptacle off of a 240v Circuit Breaker dedicated to an Appliance [closed]

I have a 240 volt 20 amp GFCI circuit breaker powering an outdoor appliance that has 2 electric motors and a motor control unit to synchronize them. I would like to wire a receptacle off of 1 hot leg ...
0
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1answer
366 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 ...
1
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2answers
801 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 ...
7
votes
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 ...
1
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2answers
1k 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 ...
0
votes
2answers
317 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 ...
0
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1answer
47 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
votes
1answer
66 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
vote
1answer
494 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 ...
0
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3answers
2k 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
137 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
votes
3answers
8k 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 ...
7
votes
4answers
4k 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-...
0
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1answer
931 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
votes
2answers
522 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-...
4
votes
2answers
7k 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 (...
0
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2answers
114 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 ...
0
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3answers
1k 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 ...
-1
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2answers
562 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 ...
3
votes
2answers
35k 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 ...