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Rule of thumb: the hot wires connect to side of outlet.
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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 | |
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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 | |
 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. |
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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 |
 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: |
  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 |
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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 QP type 2" wide Plug-in breakers Buy double-pole: Choose from 15 to 125 amp |
Double-pole 240 volt breaker QO type 2" wide Snap-down breakers Buy double-pole: 20 amp double-pole QO circuit breakers at Amazon |
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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 |
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30-50
amp/ 3-prong/ range 10 gauge wire for 30 amp 6 gauge wire for 50 amp  |
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30-50
amp/ 3-prong/ range 10 gauge wire for 30 amp 240 volt 6 gauge wire for 50 amp 240 volt   |
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30
amp/ 3-prong/ dryer 10 gauge wire for 30 amp  |
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30
amp/ 3-prong/ dryer 10 gauge wire for 30 amp  |
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30
amp/ 4-prong/ dryer 10 gauge wire for 30 amp |
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50
amp/ 4-prong/ RV 120 volt and 240 volt |
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| Electric Car | ||
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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 | |||
 50 amp RV power outlet/ 120-240 Volt Buy: 50 amp RV power outlet at Amazon RV power outlets at Amazon RV electric panel |
 50 amp Power grip plug Buy: Camco Power grip at Amazon 30 amp power plugs |
 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 |
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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 |
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| 20-30 amp Twist Lock | |
  You can use 30 amp twist lock for 15 or 20 amp circuit. But you cannot use 20 amp for 30 amp circuit. You can use a 4-wire twist-lock device with 3-wire installation. But you can not use 3-wire twist lock with 4-wire installation. You should never use 120 volt device for 240 volt circuit.... buy the correct rating for load. Why Leviton: quality materials (ie brass connection screws) and durability over time. Why 125-250 volt ratings instead of 120-240 volt: incoming service voltage can vary at each location. |
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 |
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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 ✅✓ |
 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 | |
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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 | |||||
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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 |
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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 |
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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 |
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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 |
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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 |
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| 240 volt straight blade timers | |||||
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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 |
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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 |
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| Wiring illustrations | |||
Buy 3-wire locking/ 120-250 volt L6-30 locking outlets at Amazon L6-30 locking plugs at Amazon |
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 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. |
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 Look for markings on device: X and Y are Hot, G is ground, W is Neutral L14-30 at Amazon |
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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 |
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| 3-phase
outlets and plugs Cooper phase wiring diagrams |
  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 |
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 Typical single-phase household circuit Larger image |
 3-phase Larger image |
 3-phase Larger image |
 Typical household circuit Larger image |
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 Typical 120Volt household circuit Larger image |
 Typical 240V household circuit Larger image |
 Typical 120Volt household circuit Larger image |
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Resource: Intermatic control centers: and parts Digital control centers and parts Tork control centers and parts Subpanels All control centers and parts |
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Resource: Programmable timers Countdown timers Off delay timers On delay timers Timer modules Din rail Twin & one-shot Woods Intermatic Tork |
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30-50
amp plug
