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How to wire 240 volt outlets and plugs
Rule of thumb: the hot wires connect to side of outlet.

Resources: safe electric wiring
Horsepower rating of plugs and receptacles
Always connect ground wire
Use only 600 volt wire.
Lamp cord, extension cords are not rated 600 volt.
Use copper wire only. Aluminum wire is fire risk and should be avoided or installed by professional.

30 amp breaker use 10 gauge /
120-240 volt 30 amp outlet can be installed on 30 amp breaker only/ use 10 gauge wire ... cannot be connected to 15-20-40 amp breaker.

Orange/ #10 gauge wire, with ground ... 30 amp capacity. Safe maximum: 30 x 80% = 24 amps.
Buy:
10-2 gauge/ 30 amp
10-3/ 30 amp
Southwire electric tools
Yellow 12 gauge 20 amp
120 volt 20 amp outlet can be installed on 20 amp breaker, but not 15 amp breaker/ use 12 ga wire.
... cannot be connected to 30-40 amp breaker. 1

Yellow/ #12 gauge wire, with ground ... 20 amp capacity. Safe maximum 16 amps.
Buy:
12-2 gauge/ 20 amp
12-3/ 20 amp

NMB is house wiring
UF is underground
Rolls of stranded wire
50-60 amp breaker use 6 gauge /
240 volt 50 outlet can be installed on 50 amp breaker only
6-2 wire
Buy:
6-2 wire
Southwire electric tools
NMB is house wiring
UF is underground
40-50 amp breaker use 8 gauge /
240 volt 40 amp outlet can be installed on 40 or 50 amp breaker only
6-2 wire
Buy:
8-2 wire
Southwire electric tools
NMB is house wiring
UF is underground
multimeter
Multimeters
Voltage is tested across two separate wires. Ohms or resistance is tested across both ends of same wire. Amperage is tested along one or two points on same wire.
Buy:
Analog multimeter
Multimeters at Amazon
Klein multimeter
Electric testers at Amazon
Clampmeter for testing amp flow on line
Southwire armored cable cutter
Electrical tools must be insulated.
Always best to disconnect power, but insulation failure, lack of proper grounding, grounded neutral, lack of GFCI, out-of-code wiring, generator operating without transfer switch, and other problems still pose a risk to anyone working on electric power ... even when breaker is off.

Buy:
Electrician tools kits
KLEIN TOOLS
Tools kits
IRWIN tools
KNIPEX

Telephone cable knife
Low Voltage Mounting Bracket for Telephone

Protect wiring from damage
Use nipper instead of pliers or screwdriver for removing staples (and nails). Do not damage cable or wires inside cable.

-Code says: Cable SHALL BE secured without damage to the outer covering. NEC sec. 336-15
Buy
End cutting nippers at Amazon
Double-pole 240 volt breaker
double-pole breaker
QP type
2" wide Plug-in breakers
Buy double-pole:
Choose from 15 to 125 amp

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. ALL OUTLETS MUST BE GROUNDED.

Silver screw => Neutral. 
Neutral is not required for 240 volt.

More detail: BY code, if outlet has 4-prongs, then it must be connected to 4 wires that come from breaker box, consisting of 2 Hots, a ground and a Neutral ...
If there are only 3 wires from breaker box, consisting of 2 Hots and a ground, then install 3-prong outlet ....
If you have 4 prong outlet, but only 3 wires from breaker box ...and no neutral wire is available ... you can temporarily skirt electric code, and connect no wire to the W terminal. This creates no fire or shock hazard.
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.

More detail: If you have 3-prong outlet, but have 4 wires coming from breaker box, consisting of 2 Hots, a ground and a Neutral, then cap off the Neutral wire. Capping off Neutral wire creates no fire or shock hazard, as long as twist on connector is very tight and covers all bare copper.
Never connect Neutral to ground screw. Never connect Neutral and ground wire together on same screw. Resource: 240-volt-plug-has-3-outlets-but-box-has-4-wires

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.
If there is no W, then no Neutral is used.
Notice shape of blade slots: the odd shape is ground.

10-3 wire

Hot wires can be Black-Red or Black-White
Neutral not required for 240V
How to test for 120 volt or 240 volt
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 circuits
How-to-wire-240Volt outlet and plug
Larger image
Single-phase 240 volt outlet is marked X-Y-W-G or X-Y-G

X and Y are Hot, W Neutral, G ground
120V and 240V need two wires to complete circuit, plus 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.
NOTE: you cannot put all 9 of these devices on same breaker since some are 30 amp and some are 50 amp. Illustration only shows how to connect wires to XYWG terminals.
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
NEC (National electric code)
120 volt outlets / receptacles

120 volt 30 amp outlet can be installed on 30 amp breaker only
120 volt 20 amp outlet can be installed on 20 amp breaker, but not 15 amp breaker/ use 12 ga wire
120 volt 15 amp outlet, AFCI, GFCI, timer, switch etc can be installed on 15 or 20 amp breaker
Wire size must match breaker rating, and device terminals rated for wire size

240 volt outlets/ receptacles
240 volt 50 amp outlet can be installed on 50 amp breaker only/ use 6 or 8 ga wire
240 volt 40 amp outlet can be installed on 40 or 50 amp only
240 volt 30 amp outlet can be installed on 30 amp breaker only/ use 10 gauge wire
240 volt 20 amp outlet can be installed on 20 amp breaker, not 15 amp breaker
240 volt 15 amp outlet can be installed on 15 or 20 amp breaker
Wire size must match breaker rating, and outlet terminals rated for wire size

Buy:
NEC books
Dewalt plumbing/ electrical codes
Basic electric book
National electric code guide/ illustrated

Household NM-B Wires are color-coded so inspectors/ electricians can easily identify which wire is used during construction
Match wire size and breaker amp rating
If your home was wired by professional electrician who pulled permits, then circuit breaker and wire size will match. If manufactured home or travel trailer has not been altered by homeowner then breaker and wire size will match.

If breaker is oversized for wire... fire danger
Breaker can let too much amperage travel through the wire. Wire can overheat and cause fire.
Call electrician if you suspect wiring is not correct,
Absolute electrocution danger when removing cover off main panel. More information below.
Main breaker terminals are still Hot when main breaker is turned off.

Use 600 volt solid copper wire only
Do not use stranded wire inside main breaker box or any permanent box.
Stranded wire can be used for extension cord connectors and plugs.

Do not use extension cord for permanent household wiring
Extension cords are used for connectors and plugs only.
Read more about uses for extension cords

Buy:
Southwire at Amazon
Code says: Use connected/ double-pole breaker for 240 volt
Against code: Use 2 single breakers to supply 240 volt, unless the switches are connected and rated for same amps

If double breaker is rated for 30 amp, then BOTH sides of the breaker are each 30 amp (not 15 each)
Power is doubled with 240 volt vs 120 volt, amps are not halved

Wire size and breaker size must match.

Resources:
How to replace circuit breaker
Not enough space in breaker box
Safe electric wiring
Tandem breakers
Larger image
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
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:
Levi ton At Amazon
All 50 amp flush outlets
Outlet cover

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

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
8-3 50 amp power cord 50'
6-4 60 amp cord 100'

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 amp/ 3-prong/ dryer
10 gauge wire for 30 amp
3 prong 30 amp dryer wiring

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

30 amp surface-mount outlet
Buy:
Eaton At Amazon
Leviton At Amazon
30 amp surface mount 
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

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/ 4-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:
Hubble at amazon
4 prong plugs

Pigtail
Buy:
Coleman 30 amp 4'
Coleman 30 amp 6'
Certified 4-5-6-10 foot
10-4 30 amp power cord
50 amp/ 4-prong/ RV


120 volt and 240 volt

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

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

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

Electric Car
Car charger Electric Car
Use receptacles shown above
Wire as shown using 30 amp breaker + 10 gauge wire/ up to 100' 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

Resource:
Color code for wire

3 prong dryer plug to electric car
Buy:
Adapter: 3 prong dryer plug to electric car
Electric connectors
toggle between water heater and car charger'
Toggle between water heater and car charger

Larger image
This can be accomplished with simple 3-way 30 amp switch:
.... your 240 volt line has 2 hot wires.... take one hot wire and run it to both the charge station and the water heater ... connect the second hot wire to the common or different-colored screw on the 3 way switch.
Second wire to water heater connects to one of the other screws, and second wire to charge station connects to remaining screw.
Buy:
30 amp 3 way switch
Tork TU timer/ 40 amp DPDT/ same wiring
Tork DTU 7-day programmable timer 40 amp DPDT/ same wiring
Intermatic GM40AV/ 40 amp DPDT/ same wiring
Buy:
Eaton At Amazon
Pass & Seymour At Amazon
Car charger straight-blade
Car charger L-blade
Adapter: 3 prong dryer plug to electric car
Electric connectors
Resource:
How to wire the 40 amp DPDT timers
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
RV electric panel
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
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
RV electric panel
Resource
Trailer 120 volt connection
50 amp connection
Read the conversation about 120 volt RV wiring


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
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
Leviton 2311 125V 20 amp
2611/ 125 volt/ 30 amp

2321/ 250 volt/ 20 amp
2621/ 250 volt/ 30 amp

2411/ 4-wire 125-250 volt/ 20 amp
2711/ 4-wire 125-250 volt/ 20-30 amp
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
2313/ 125 volt/ 20 amp
2613/ 125 volt/ 30 amp/

2323/ 250 volt/ 20 amp
C2623/ 250 volt/ 30 amp

2413/ 4-wire/ 125-250 volt/ 20 amp
2713/ 4-wire/ 125-250 volt/ 30 amp
Resources:
Locking receptacle Wiring diagrams

Locking receptacles

You can use 30 amp twist lock for 15 or 20 amp circuit. But you cannot use 20 amp for 30 amp circuit.
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
2310/ 125 volt/ 20 amp
2610/ 125 volt/ 30 amp

2320/ 250 volt/ 20 amp
2620/ 250 volt/ 30 amp

2410/ 4-wire/ 125-250 volt/ 20 amp
2710/ 4-wire/ 125-250 volt/ 30 amp

Buy double outlet
4550/ double/ 125 volt/ 15 amp
4700/ double/ 250 volt/ 15 amp

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 15 amp plug

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

Buy:
6-15R 15 amp connector

Buy 20 amp connector:
6-20R 20 amp 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

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
240-120 volt receptacleOption: 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 applicationLarger image
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 outlet20 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


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 timerAppliance 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

15 amp 240 volt timer

Buy:
Titan programmable 15 amp 240 volt timer
HB112 Analog 15 amp timer

Titan analog 15 amp 240 volt timer


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
750 watt transformer
Step up step down
Square D transformer
Larger image
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
Larger image
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
Larger image
How to wire 240 volt outlet and plug
3-phase
Larger image
How to wire 240 volt outlet and plug
3-phase
Larger image

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

Typical 120Volt household circuit
Larger image




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Porter-Cable
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Klein hand tools
Fluke electrical testing
Dremel hobby tools

Campbell Hausfeld air powered
Tekton automotive

Powerbuilt automotive
Saws and saw blades

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