Questions tagged [120-240v]

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

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240 to thermostat for electric heat reading 120v and 70v

I had an electrician in to replace some thermostats a few months ago. One of the thermostats that was replaced was an older analog dial type. The electrician replaced it with a digital thermostat ...
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4 votes
4 answers
1k views

Is a 120V/208V MWBC good enough for 240V loads?

As detailed in a previous post, I was planning to use the dryer circuit in my condo as a MWBC. A 120V/20A outlet between one of the two hot conductors and neutral would power my small washer and dryer ...
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2 votes
1 answer
155 views

"Lending" the ground wire of a 120V/15A circuit to a 240V/30A circuit

I have read in a previous forum post Is it OK to borrow a ground wire from a different circuit? that NEC in article 250.130(C)(4) allows the grounding of an ungrounded circuit by connecting to an ...
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  • 151
0 votes
1 answer
124 views

Change 110 outlet to 220

I’d like to move my clothes dryer. It requires a 220 plug. I used to have a whirlpool bathtub that was on its own 110 outlet. Can I convert the existing 110 outlet to a 220 outlet with needing to ...
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0 votes
1 answer
62 views

Can you wire a regular 120/125v recepticle with two hots? [closed]

I have some LED Grow lights that can take 120/240/277 volt of power. The power cord is a a regular 125v plug w/ ground. My question is can I wire a regular 125v recepticle with two hots (1 on brass ...
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0 votes
3 answers
149 views

Upgrading wiring to detached garage subpanel

My garage is a 2 car detached garage is approximately 33ft from the house. My current setup (previous owners doing) is a 15a breaker (main panel) to 12/2 UF in a metal (aluminum?) piping that runs ...
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1 vote
2 answers
114 views

2 Pole 20amp Breaker used to power 120v circuit?

In my panel I found a 2 pole 20amp breaker connected to 12/3. When I trace this circuit, it begins to power outlets in my dining room. At outlet 1, the 12/3 comes in with the Red leg powering the ...
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2 votes
1 answer
125 views

Wiring for switched NEMA 6-20R and 5-20R in same box in garage

My goal is to have 20A receptacles in a particular spot in my garage dedicated to power tools (such as saws) whose motors can be configured for either 240V or 120V, with a switch as a handy second ...
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0 votes
2 answers
103 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 ...
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  • 115
9 votes
3 answers
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 ...
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  • 383
9 votes
6 answers
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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 ...
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1 vote
3 answers
182 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 ...
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10 votes
5 answers
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. ...
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1 vote
1 answer
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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 ...
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0 votes
2 answers
59 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 ...
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2 answers
105 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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0 votes
2 answers
358 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?
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10 votes
8 answers
3k 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 ...
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1 vote
0 answers
63 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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0 votes
2 answers
238 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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0 votes
0 answers
35 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 ...
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0 votes
0 answers
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 ...
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4 votes
3 answers
736 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 ...
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5 votes
2 answers
1k 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 ...
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0 votes
1 answer
192 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 ...
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1 vote
1 answer
226 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 ...
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1 vote
0 answers
88 views

30V on 120 circuit - swapped dishwashers and circuit dropped to 30V [closed]

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, ...
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0 votes
3 answers
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 ...
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2 votes
1 answer
211 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 ...
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2 votes
3 answers
1k 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 ...
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0 votes
1 answer
170 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 ...
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0 votes
2 answers
240 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 ...
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8 votes
1 answer
592 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 ...
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  • 167
2 votes
2 answers
180 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 ...
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1 vote
2 answers
3k 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 ...
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5 votes
1 answer
398 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 ...
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5 votes
3 answers
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 ...
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  • 607
16 votes
5 answers
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 ...
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1 vote
1 answer
123 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 ...
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  • 11
0 votes
1 answer
454 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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1 vote
2 answers
1k 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 ...
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7 votes
2 answers
2k 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 ...
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  • 207
1 vote
2 answers
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 ...
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  • 193
0 votes
2 answers
483 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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0 votes
1 answer
65 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 ...
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3 votes
1 answer
69 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 ...
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  • 31
1 vote
1 answer
618 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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0 votes
3 answers
3k 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 ...
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0 votes
1 answer
172 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 ...
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15 votes
3 answers
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 ...
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