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How to wire 240 volt outlets and plugs
Rule of thumb: the hot wires connect to side of outlet.
240 volt circuits
How-to-wire-240Volt outlet and plug
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Single-phase 240 volt outlet is marked X-Y-W-G or X-Y-G
120V and 240V need two wires to complete circuit, and ground wire for safety.
120V requires 1 hot and 1 neutral.
240V requires 2 hots.
Neutral is not needed for 240volt electric circuit, but is sometimes included on electrical device.
Resources:
See inside main box
Figure volts amps watts
Select correct wire and breaker
Electrical formulas

Commercial 3-phase outlet is marked X-Y-Z-G or X-Y-Z-W-G
Resource:
How to wire 3-phase
Basics
Wire 240 Volt outlet
The hot wires connect to brass-colored screws located on side
Look for screw color on outlet
Brass (or black) for Hot, Silver for Neutral, Green for ground
Some outlets do not have color-coded screws.

Hot wires can be Black-Red or Black-White
Green screw => bare copper or green ground wire

Silver screw => Neutral.
Neutral not required for 240 volt
Ignore Neutral screw if no neutral wire available.
wire 240 Volt outlet Image shows 2 hot wires with ground.
2 Hot wires and 1 ground wire.
Hot wires can be red and black -or- white and black
Either hot wire can connect to either brass terminal

Look for color of screws when wiring outlets
Green for ground, Hot1 and Hot2 connect to either brass-or-black screw. Outlet might not have neutral wire.
Neutral not required for 240 volt
Ground connection: Look For green screw
wire 240 Volt outlet
Twist Lock
Image shows 2 hot wires with ground
Hot wires can be red and black -or- white and black
Either hot wire can connect to either brass terminal

Look for Markings on device:
X and Y are for Hot wires, and G is for ground, W for Neutral
Notice shape of blade slots:

10-3 wire

Hot wires can be Black-Red or Black-White
Neutral not required for 240V
How to test for 120volt or 240volt
How to know if wire carries 120V or 240V?

Tape tester leads to wood sticks, and stand on dry wood boards. Never stand on outdoor ground soil, or touch or lean into metal. Put down dry boards. Separate wires for testing.
Test each wire to bare ground wire. If both wires test for power to ground, the circuit is probably 240Volt. Use multi-meter to confirm exact voltage.
Test each wire to bare ground. If tester shows power then wire is Hot
Buy:
Electrical testers
240 volt breakers Code says: Use connected/ double-pole breaker
Against code: Use 2 single breakers to supply 240 volt, unless the switches are connected and rated for same amps
Double-pole 240 volt breaker
double-pole breaker
QP type
2" wide Plug-in breakers
Buy double-pole:
Choose from 15 to 125 amp
Double-pole 240 volt breaker
double-pole breaker
QO type
2" wide Snap-down breakers
Buy double-pole:
20 amp double-pole
QO circuit breakers at Amazon
Tandem breakers
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Tandem breakers
This panel has several tandem breakers
Each tandem fits over one busbar, and pulls double duty, supplying two separate circuits and increasing number of breaker circuits.

You cannot draw 240 volt from one tandem breaker..
But if two tandem breakers are side-by-side, then 240 Volt is possible.
For 240Volt, select the inside terminals... one from each tandem breaker.
Connect 240V wire to these two terminals.
To meet code, notice there is a connector bar (color reddish) that physically joins the two switches.
If you are connecting 20 amp 240 volt, then both breakers must be 20 amp. In other words, 20 amp 240 volt breaker is NOT two 10 amp breakers, and both legs are pedaling the bike at 20 amps, and not 10 amps apiece. This question arises among electricians.
Buy:
Tandem breakers at Amazon
Difference between single phase and 3-phase
30-50 amp plugs and outlets
Dryer cords 30-40 amp
Range cords 40-50 amp

50 amp flush outlet
Buy:
Leviton At Amazon
All 50 amp flush outlets
Outlet cover

50 amp surface-mount outlet
Buy:
Eaton At Amazon
Pass & Seymour At Amazon

50 amp plug
Buy:
Legrand At Amazon
Forney At Amazon

30-50 amp pigtails
Buy:
Whirlpool 40 amp 4'
Certified 30 amp 6'
Coleman 50 amp
30-50 amp/ 3-prong/ range
10 gauge wire for 30 amp
6 gauge wire for 50 amp

3 prong 50 amp range

50 amp flush outlet
Buy:
At Amazon
At Amazon
30 amp flush outlets
Outlet cover

50 amp surface-mount outlet
Buy:
At Amazon
Surface mount receptacles

50 amp plug
Buy:
Eaton At Amazon
Wire:
10 gauge wire for 30 amp
8 gauge wire for 50 amp

no pigtail/ cord
30-50 amp/ 3-prong/ range
10 gauge wire for 30 amp 240 volt
6 gauge wire for 50 amp 240 volt


30 amp flush outlet
Buy:
Leviton At Amazon
Leviton At Amazon
Outlet cover

30 amp surface-mount outlet
Buy:
Eaton At Amazon
Leviton At Amazon
30-50 amp plug
Buy:
Leviton At Amazon
No pigtail/ cord
30 amp outlet cover
Buy:
30 amp outlet covers
Oversized 2 gang plate
30 amp/ 3-prong/ dryer
10 gauge wire for 30 amp
3 prong 30 amp dryer wiring

30 amp flush outlet
Buy:
Legrand At Amazon
Leviton At Amazon
Outlet cover

30 amp surface-mount outlet
Buy:
Eaton At Amazon
Pass & Seymour At Amazon

30-50 amp Plug
Buy:
Forney At Amazon

Pigtails
Buy:
Whirlpool 30 amp 4'
Certified 30 amp 6'
Certified 30 amp 10'
Coleman 50 amp
30 amp/ 3-prong/ dryer
10 gauge wire for 30 amp

30 amp flush outlet
Buy:
Leviton At Amazon

30 amp surface-mount outlet
Buy:
Eaton At Amazon

30 amp Plug
Buy:
Leviton At Amazon
Hubble at amazon

Pigtail
Buy:
Coleman 30 amp 4'
Coleman 30 amp 6'
Certified 4-5-6-10 foot
30 amp/ 4-prong/ dryer
10 gauge wire for 30 amp

30-50 amp flush outlet
Buy:
Legrand At Amazon
Outlet cover

50 amp surface-mount outlet
Buy:
Eaton At Amazon
Eaton At Amazon

50 amp Plug
Buy:
Legrand At Amazon
Power grip at Amazon

Pigtail
Buy:
GE 50 amp at Amazon
50 amp pigtail to 30 amp
30 amp pigtail to 50 amp
Coleman 50 amp 4-5-6 foot
50 amp/ 4-prong/ RV


120 volt and 240 volt
Electric Car
Car charger Electric Car
Use receptacles shown above
Wire as shown using 30 amp breaker + 10 gauge wire/ up to 75' away... longer distance, use 40 amp breaker and 8 gauge wire.

Buy:
Car charger straight-blade
Car charger L-blade
Adapter: 3 prong dryer plug to electric car
Electric connectors

3 prong dryer plug to electric car
Buy:
Adapter: 3 prong dryer plug to electric car
Electric connectors
RV connection
RV power outlet
50 amp RV power outlet/ 120-240 Volt
Buy:
50 amp RV power outlet at Amazon
RV power outlets at Amazon
Power grip plug
50 amp Power grip plug
Buy:
Camco Power grip at Amazon
30 amp power plugs
Power grip cord
50 amp Power grip RV extension cord
Buy:
Camco 50 amp 30'
Camco 50 amp 15'
All RV extension cords
50 amp pigtail to 30 amp
30 amp pigtail to 50 amp


For RV,  the 50 amp is 240 volt and 30 amp outlet is 120 volt, not 240 volt, and wires are typically Black-white Hot-Neutral... with silver screw for  Neutral ... see illustration below
RV connection Nearly ALL RV Sites have a pedestal providing all 3 RV power sources - 50 amp 240V, 30 amp 120V, and 20 amp 120V

A. 14-50R 240 vac / 50 amp
B. TR-30R 120 vac / 30 amp
C. 6-20R 120 vac / 20 amp
Sounds like we need a separate page for travel trailer connections.
Buy:
RV power panel outlet box

Resource:
Trailer 120 volt connection
50 amp connection
Read the conversation about 120 volt RV wiring
20-30 amp Twist Lock

Locking plugs/ twist lock
Nema L5 (look at bottom of graphic for Nema category) is same configuration for 20P or 30P/ use for 15, 20 or 30 amp
Nema  L6 is same configuration for 20P or 30 P/ use for 15, 20, 30 amp
Nema  L14, 4-pole is same configuration for 20P or 30P/ use for 20 or 30 amp
125 volt 3-wire has silver, brass and green screws
250 volt 3-wire has brass, brass, and green screws
125-250 volt 4-wire has silver, brass, brass, green screws

Buy:
Leviton 2611/ 125 volt/ 15-20-30 amp/ 3-pole
Leviton 2621/ 250 volt/ 20-30 amp/ 3-pole
Leviton 2711/ 125-250 volt/ 20-30 amp/ 3 pole

Resources:
Locking plug Wiring diagrams
Locking connectors
Locking connectors
Locking connectors/ twist lock
Nema L5 (look at graphic for Nema category) is same configuration for 20R or 30R/ use for 15, 20 or 30 amp
Nema  L6 is same configuration for 20R or 30 R/ use for 15, 20, 30 amp
Nema  L14, 4-pole is same configuration for 20R or 30R/ use for 20 or 30 amp
Buy:
Leviton 2613/ 125 volt/ 20-30 amp/ 3-pole
Leviton C2623/ 250 volt/ 20-30 amp/ 3-pole
Leviton 2713/ 125-250 volt/ 20-30 amp/ 4-pole
Resources::
Locking receptacle Wiring diagrams
✅✓
Locking receptacles
Locking receptacles
Nema L5 (look at graphic for Nema category)  is same configuration for 20R or 30R/ use for 15, 20 or 30 amp
Nema L6 is same configuration for 20R or 30 R/ use for 15, 20, 30 amp
Nema L14, 4-pole is same configuration for 20R or 30R/ use for 20 or 30 amp

Buy:
Leviton 2610/ 125 volt/ 20-30 amp/ 3-pole
Leviton 2620/ 250 volt/ 20-30 amp/ 3-pole
Leviton 2710/ 125-250 volt/ 20-30 amp/ 4-pole

Buy double outlet
Leviton 4550/ double/ 125 volt/ 15 amp/ 3-pole
Leviton 4700/ double/ 250 volt/ 15 amp/ 3-pole

Resources:
Locking receptacle Wiring diagrams
Generator twist-lock connection
Generator outlet Generator outlet box wiring:
4-prong: All 4 prongs are locking. Rounded  prong with upturn is ground connection. Prong located opposite ground is Neutral connection. If there is no neutral wire, then do not connect any wire to neutral. Other two prongs are for hot wires
3-prong
:  Rounded  prong with upturn is ground connection. Other two prongs are for hot wires. There is no neutral connection

Buy:
Twist lock plug / 30 amp/ at Amazon
Twist lock outlet / 30 amp/ at Amazon
4-prong 30 amp generator outlet
Generator outlet boxes at Amazon
4-prong 30 amp generator outlet/ 7500 watt at Amazon
3-prong 50 amp generator outlet / 12,500 watt at Amazon

Resource:
How to wire transfer switch
How generator works
Connect water heater to generator
15-20 amp 240 volt straight blade
straight blade plugs

15 and 20 amp Plugs
Look at appliance rating.
Install correct outlet and breaker.
Use 15 amp breaker for 15 amp 240 volt.
Use 20 amp breaker for 20 amp 240 volt.

Buy 15 amp plug:
Leviton 6-15P 240 volt 20 amp plug
Legrand 15 amp plug

Buy 20 amp plug:
Leviton 6-20P 240 volt 20 amp plug
Leviton 20 amp plug
Eaton 20 amp commercial plug
15 and 20 amp Connectors
Look at rating plate of device for amperage

Buy:
15 amp connector
Leviton 620CA
Leviton 5669
12 gauge extension cord

Buy 20 amp connector:
20 amp 6-20R connector

240 volt 15 amp Receptacles
Look at rating plate of device for amperage

Buy 15 amp receptacle
5029 brown, white, ivory single
5661-Cr yellow single
5089-I ivory single
Decora white
Stainless single cover plate

Buy:
Leviton single hole plates
Stainless 2-gang plate

You cannot plug two 15 amp 240 volt air conditioners into the same plug without running two separate 15 amp lines, on different breakers, to the receptacle.
Buy:
5662 15 amp 240 volt receptacle double
Leviton 6-15R 15 amp 240 volt receptacle
Decora white
240 volt straight blade receptacle 240 volt 20 amp Receptacles
Look at rating plate of device for amperage

Buy 20 amp receptacle
5461 single 20 amp 240 volt receptacle
5461-W single 20 amp white
Decora ivory
Stainless single cover plate

Buy:
Leviton single hole plates
Stainless 2-gang plate
Leviton receptacle plate

You cannot plug two 20 amp 240 volt air conditioners into the same plug without running two separate 20 amp lines, on different breakers, to the receptacle.
Buy:
5462 double 20 amp  240 volt dual receptacle outlets
5822-W brown, ivory, white
Decora white
240-120 volt receptacle 240-120 volt combination receptacle
This combination receptacle lets you plug in both 120 volt lamp and 240 volt window air conditioner.
How to wire: Install 12-3 wire. Hots are connected to one double breaker inside breaker box, and Neutral is connected to Neutral busbar. Single breaker is not used. See image of 12-3 wiring inside breaker box
Option: You can draw a Neutral wire from any nearby 120 volt outlet or ceiling box, and this Neutral connects to silver screw on receptacle, however the 240 volt Hot wires must come from a dedicated breaker that serves only that 240 volt receptacle.

Caution for double receptacles: using 20 amp outlet (15 amp is pictured on left)
You cannot run more than 20 total amps at one time. Volts x amps = watts
For example if 240 volt window air conditioner pulls 16 amps, and you have 1500 watt 12.5 amp space heater on 120 volt plug, it will only work if neither is ON at same time. However if you are using 240 volt 16 amp air conditioner, and plug in 120 volt light with two 100 watt bulbs (200 watts), then the light will pull 1.6 amps and total amp draw is within capacity of 20 amp circuit.

Buy:
15 amp Ivory, Brown or White
20 amp Ivory and brown
Resource:
Basic household wiring
Wire 240 volt outlet for 120 volt application
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Change 240 volt outlet into 120 volt outlet
1) Replace 240 volt outlet with 120 volt
2) In the breaker box, the 240 volt circuit has 2 wires that connect to double breaker.
3) Leave Black wire connected to breaker.
4) Remove other wire from breaker, and connect that wire to Neutral busbar.
5) Ordinary 120 volt outlets have brass screws on one side for Black Hot wire, and silver screws on opposite side for Neutral wire.
6) caution: To change 120 volt into 240 volt is not as easy unless the 120 volt is on a dedicated breaker that serves only that outlet. Normally 120 volt outlets are connected several lights and other outlets. The 240 volt circuit needs to be dedicated, so that only that 240 volt receptacle is served by that breaker.
Buy:
240Volt outlet at Amazon
240Volt outlet at Amazon
240Volt outlet at Amazon
240Volt outlet at Amazon
240Volt plug
Window air conditioner outlet 20 amp air conditioner
Window air conditioner box in store shows voltage and type of plug.
Volts x amps = watts.
You cannot use all three 240 volt receptacles at the same time. Must install each receptacle on separate 20 amp breaker.
Notice that all electric receptacles and lights are wired in parallel and never in series.

Buy:
240 volt extension cords
6' extension cord for window air conditioner

Leviton 5842 20 amp 120-240V outlet
Leviton 5822 20 amp 240V outlet
Leviton 5821 20 amp 240Volt outlet

Resource:
Basic household wiring
240 volt straight blade timers
HB114C window air conditioner timer Appliance timer outlets
20 amp 240 volt timer
Plug in timers
Use for window air conditioner or appliance
Buy:
HB114 analog 20 amp timer
BDT programmable 20 amp 240 volt
Extra trippers for HB114
Air conditioner cords
6' extension cord for HB114 air conditioner
15 amp 240 volt timer

Buy:
Titan programmable 15 amp 240 volt timer
HB112 Analog 15 amp timer
Hydrofarm programmable 15 amp 240 volt
Titan analog 15 amp 240 volt timer
Other hardwire 240 volt timers
15 amp 240 volt plug

Resource:
Apollo timer manual
Wiring illustrations
250 volt outlets      
Buy 3-wire locking/ 120-250 volt
L6-30 locking outlets at Amazon
L6-30 locking plugs at Amazon

Example shows unusual case where 240Volt circuit has neutral and no ground wire.
240Volt circuit does not require ground wire, or neutral.
Both Neutral and ground wires join inside the breaker panel, and are essentially serving same function.
However, it is not code to complete 120Volt circuit using ground wire. So this example lets each outlet have 120volt capability.
Notice that X and Y are Hot, W is Neutral, and there is no G for ground.
3 pole 4 wire 240 volt wiring
Look for markings on device: X and Y are Hot, G is ground, W is Neutral
L14-30 at Amazon
Voltage converter Voltage converter: Step-up step down transformer
120 to 240Volt
240V to 120V
Check wattage output
Buy:
3000 watt transformer
1000 watt transformer
500 watt transformer at Amazon
100 watt transformer at Amazon
Step up step down
Square D transformer
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Convert 240Volt to 120Volt without neutral wire from breaker box.
Square D 1000 watt output transformer (high voltage)
Buck-boost transformers buck voltage down, or boost voltage up. This transformer bucks down voltage.
Convert 240Volt to 120Volt without neutral wire from breaker box.
Convert 480Volt to 240Volt or 120Volt
Type 3R outdoor enclosure

Wiring:
480Volt input connects to H1 H4, and then H2 and H3 are connected together
240Volt input connects to H1 H4, and then H3 connects to H1, and H2 connects to H4

240Volt output connects to X1 X4, and then X2 and X3 are connected together
120Volt output connects to X1 X4, and then X3 connects to X1, and X2 connects to X4

Buy:
Square D transformers at Amazon

Resources:
Read about household single-phase electricity
Read about 3-phase
How to wire 3-phase timers

3-phase outlets and plugs
Cooper phase wiring diagrams
How to wire 600 volt outletLeviton 2710
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Outlet shown can be used for 3-wire 3-phase or 2-wire single-phase.
3-phase is commercial electricity used to achieve higher average voltage and more efficiency. Voltages vary from 120-600 V depending on electric service and wiring is different than residential single-phase. Single phase requires 2 wires to complete circuit: either Hot-Hot for 240 volt or Hot-neutral for 120 volt, while 3-phase requires 3 Hot wires to complete each circuit: Hot-Hot-Hot.
Single-phase is actually a derivative of 3-phase. Since 3-phase can have a Neutral wire along with the 3 Hot wires, one Hot wire and one Neutral or two Hot wires make single-phase... so commercial applications can use 3-wire 3-phase to run motors and process equipment while using ordinary 2-wire single-phase for lights etc.
Buy:
Locking receptacles at Amazon
Twist lock plug / 30 amp/ at Amazon
Twist lock outlet / 30 amp/ at Amazon
30 amp generator outlet
Resources:
How to wire 3-phase
3-phase electricity: from power plant to end user

3-phase
Larger image
How to wire 120 240 volt outlet and plug
Typical single-phase household circuit
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How to wire 240 volt outlet and plug
3-phase
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How to wire 240 volt outlet and plug
3-phase
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How to wire 120 and 240 volt outlet and plug
Typical household circuit
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How to wire 480 volt outlet and plug
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How to wire 277 volt outlet and plug
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How to wire 240 volt outlet and plug
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How to wire 120 volt outlet and plug
Typical 120Volt household circuit
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How to wire 240 volt outlet
Typical 240V household circuit
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How to wire 120 volt outlet

Typical 120Volt household circuit
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