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2012

How to wire 240 volt outlets and plugs

Rule of thumb: the hot wires connect to side of outlet.
Wire 240 Volt outlet
The hot wires connect to brass-colored screws located on side

Look for screw color on outlet

Brass for Hot, Silver for Neutral, Green for ground
Some outlets do not have color-coded screws.
Ignore Neutral screw if no neutral wire available

MORE  ILLUSTRATIONS  BELOW

Hot wires can be Black-Red or Black-White

Rule of thumb: the hot wires connect to side of outlet.

Brass screw => Hot wire
240 volt electric circuit has 2 hot wires.

Green screw => bare copper or green ground wire

Silver screw => Neutral
Neutral not needed for 240volt electric circuit
Inside main breaker box
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Review basic 120volt and 240volt

Image shows 120Volt line and 240volt line.
Both circuits have ground wire.
Each 120 and 240 require two wires to complete circuit.
120V requires 1 hot and 1 neutral
240V requires 2 hots

Some 240Volt lines have additional neutral wire. Neutral not necessary to complete 240Volt circuit.
Some 240Volt lines have white and black instead of red and black

See basic circuits
See inside main box
Wire sizes

How to test for 120volt or 240volt

Hot wiers can be Black-Red or Black-White
How do you know if the 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.

10-3 wire
240Volt has 2 Hot wires.
Hot wires can be Black-Red or Black-White
Test each wre to bare ground. If tester shows power then wire is Hot
Neutral not required for 240V

Calculate correct wire and breaker

Electrical calculation
1) Each 240Volt outlet sold at Hardware or Home Center will have amp rating.
For example some will be rated for 40 amps, and others for 50 amps etc.

2) Each appliance will have rating-plate located on side of appliance or inside door of oven, or back of dryer.

3) Formula: Volts x amps = watts.
Watts divided by volts = amps
Volts= 240Volts

4) Example: Double-oven wattage = 7000 watts.
7000 watts divided by 240Volts = 29.16 amps.

5) Figure breaker and wire size for double-oven:
Safe amximum for 30 amp breaker is 24 amps. So double-oven needs 40 amp breaker.
Use 8 gauge wire for 40 amp breaker.
Read more

Wiring illustrations start here

Dryer and range cords
                  10-3 dryer cord            10-3 with ground dryer cord            6-2 range cord  no ground        6-2 with ground range cord
Example dryer and range cords with 2-wire, 3 wire, and 4 wire
ALWAYS choose cord with ground wire
Dryer cords 30-40 amp at Amazon
Range cords 40-50 amp at Amazon
wire 240 Volt outlet Look at screw color

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

Notice color of screws when wiring 240Volt outlets
Green for ground
Hot1 and Hot2 connect to either brass screw
Wire 240 volt outlet for 120 volt application
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240Volt outlet can be wired for 120Volt

Ordinary 120volt outlets have brass screws on one side for Hot wire, and silver screws on opposite side for neutral wire.

Buy:
240Volt outlet at Amazon
240Volt outlet at Amazon
240Volt outlet at Amazon
240Volt outlet at Amazon
240Volt plug

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

Notice color of screws when wiring 240Volt outlets
Green for ground
Hot1 and Hot2 can connect to either brass screw

Look for Markings on device:
X and Y are for Hot wires, and G is for ground

Notice shape of blade slots:
The rounded L shape is ground in all 120V, 277V and 240V volt applications
Round shapes with flat bottom are ground
250 volt outlets

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.
Wire 240 Volt outlet Image shows 3-wire with ground.Notice color of screws when wiring 240Volt outlets
Green for ground
Silver for Neutral
Hot1 and Hot2 can connect to either brass screw
The extra wire is a neutral wire. Neutral is not necessary to complete 240volt circuit. Some appliances might require neutral wire to operate 120volt parts inside the appliance. This is rare with todays appliances and electronics.

Notice color of screws when wiring 240Volt outlets
Green for ground
Silver for Neutral
Hot1 and Hot2 can connect to either brass screw
Buy 50 amp outlet at Amazon
Buy 50 amp outlet / no neutral/ at Amazon
Buy 50 amp outlet at Amazon
Buy 50 amp outlet at Amazon

Buy 50 amp plug at Amazon
Buy 50 amp plug / no neutral/ at Amazon
Buy 4' range cord with plug
Wire 240 Volt outlet Image shows 3-wire with ground.
2 Hot wires and 1 ground wire and 1 neutral wire.
The extra wire is a neutral wire. Neutral is not necessary to complete 240volt circuit. Some appliances might require neutral wire to operate 120volt parts inside the appliance. This is rare with todays appliances and electronics.

Notice color of screws when wiring 240Volt outlets
Green for ground
Silver for Neutral
Hot1 and Hot2 can be either color and can connect to either brass screw
10-3 wire
10-3 w/g (with ground) NM-B indoor household wire
See wire gauges and charts
Dryer outlet
Look for markings on device:
X and Y are Hot
G is ground
W is Neutral
Image on left is same as illustration in box directly above.
Notice that sometimes the screws are NOT color coded.
Rule of thumb is that Hot wires connect on sides of outlet. The outlet installs in typical one-gang box. Outlet can be rotated so ground is at top of bottom.
Notice that red hot wire and black hot wire can go on either side of device. Both hot wires in 240Volt household circuit are identical.

Image on left is from
Buy:
Buy 30 amp outlet at Amazon
Note on the corner hardware site that it says maximum load on 12 gauge wire is 20 amps. This is misleading.
Electricians use 80% rule.
True that 12 gauge wire connects to 20 amp breaker, but electricians apply 80% rule to calculate load rating for breakers and wires.
20 amp breaker x 80% = 16 amps safe maximum for 20 amp breaker.
30 amp breaker x 80% = 24 amps safe maximum for 30 amp breaker
Read more
The L shape is Neutral
If white neutral is not present, then do not attach any wire
Round shapes with flat bottom are ground

50 amp plug at Amazon
50 amp outlet at Amazon
How-to-wire-240Volt outlet and plug
Plug or outlet with 3 Hot wires X Y Z is for 3-phase illustrated lower on page
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240 Volt outlets and plugs
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Window air conditioner outlet
Leviton 5842 20 amp 120-240V outlet at Amazon
Leviton 5822 20 amp 240V outlet at Amazon
Leviton 5821 20 amp 240Volt outlet at Amazon
Generator outlet

Twist lock generator outlet box wiring:

4-prong generator outlet wiring: All 4 prongs are locking.
all 4 prongs are rounded
1 prong is rounded with upturn.... this it the ground connection
Prong locared opposite the ground connection is Neutral connection
If there is no neutral wire, then do not comnnect any wire to neutral connection
Other two prongs are for hot wires
3-prong generator outlet wiring: All 4 prongs are locking.
all 3 prongs are rounded
1 prong is rounded with upturn.... this it the 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
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
HB114C window air conditioner timer

Intermatic HB114 timer for window air conditioner

Buy HB114 timer at Amazon
All Intermatic timers

Appliance timer outlets
3 pole 4 wire 240 volt wiring
Look for markings on device: X and Y are Hot, G is ground, W is Neutral

Larger image Straight-blade

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Typical Household wire ratings

14 ga wire ++  rated for 120 Volts x 15 Amp breaker  = 1800 Watts x 80% = 1440 Watts

12 ga wire ++ rated for 120 Volts x 20 Amp breaker = 2400 Watts x 80% = 1920 Watts

10 ga wire ++ rated for 240 Volts x 30 Amp breaker = 7200 Watts x 80% = 5760 Watts

Wire sizes

Wire size chart with distances
Electrical formulas

Figure volts amps and watts
http://waterheatertimer.org/How-to-wire-Intermatic-CA3750.html

How to wire outlets and plugs

Cooper phase wiring diagrams
How to wire 600 volt outletLeviton 2710
3-phase or single-phase
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Twist lock plug / 30 amp/ at Amazon
Twist lock outlet / 30 amp/ at Amazon
30 amp generator outlet

3-phase
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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 houshold circuit
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How to wire 120 volt outlet

Typical 120Volt household circuit
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3 Phase timers, 3 Phase outlets & surge

480 3 phase delta 3-phase timer
How to wire 3-phase outlets and plugs
How to wire 3-phase timer

Household electricity and switches

circuit breakers are warm Difference between 120 and 240volts

Troubleshoot household electricity


How to wire Cooper 277
Pass and seymour TM8113 How to wire switches

How to wire GFCI

How to wire timers

Additional links

Electricity leaves power plant What is 3-phase electric: power plant to end user

Troubleshoot Household electricity

Figure volts amps watts for electric water heater
How to wire tankless electric
How to change water heater temperature using timer
How to change water heater from 240Volt to 120Volt
How to wire thermostats
How to wire water heater for off peak operation

How to twist wire
How to wire Cooper 277
How to wire combo switch-outlet
How to replace 3-speed fan switch

How to wire 3-way switches
How to wire 4-way switches
How to wire TM811 and TM8111 switches
How to wire wall timers
How to wire box timers
How to wire Dayton off-delay timer
How to wire pin timers

How to wire and troubleshoot photo eyes
How to wire switches

Troubleshoot Malibu outdoor lights
Terminals
Select and install wire nuts
Select wire size

Replace breaker
Install subpanel

Electrical formulas
Electricians forum
How to wire GFCI
How to wire GFCI combo

Basic water heater circuit
How to wire water heater for 120Volt
Install old work box

How to drop wire from attic
Romex connector

How to wire 240volt outlets
How to install 3-phase timer
How to wire 3-phase outlets
How to wire 3-phase surge protector
What is 3-phase

How to wire whole house surge protector
How to wire under-counter water heater

See inside main breaker box
Fuseholder
Contactors
How to solder wires
Whole house surge protector
3-phase surge protection
Circuit breakers

Difference between 120 volt and 240 Volt
Difference between 50Hz and 60Hz
How to install electric meter on water heater
How to wire water heater thermostat
How to wire water heater with switches and timers

6x6x4 Enclosures
Intermatic timer enclosures
Compare timers
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Westinghouse timers
Westinghouse
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Woods 49028
Outdoor timers

Power strips
3-phase timer
3-phase timer
Diehl timers
Diehl timers


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Intermatic box timers:
How to set box timers
Troubleshoot box timers
Trippers and parts
Intermatic GM series
Intermatic parts
Intermatic trippers and parts
 Dayton Sprinkler timers Power pack
Wire T1906 and T1905 timers
  
Wire T-101 T103 T104 timers
Paragon timers and manuals
Tork TU universal timer
Westek box timers
Wire EH40 and WH40 timers
  
Tork timers and manuals
Tork TU universal timer
Troubleshoot intermatic
Sylvania timers

Leaking water heater
Intermatic timers
Intermatic GM series
Pool timers and manuals
Intermatic T104P201
Wire GE 15207 timer
3-phase timer
3-phase timer

GE box timers
How to wire Intermatic GM40
Intermatic GM series

EH10 water heater timer

Tork pool timers
How to wire Tork DTU40
Tork-DTU40


Anode rods

Cost to run water heater

Replace circuit breaker

Clean sediment from tank

Low hot water pressure

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Recirculation system
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Resources:
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Troubleshoot electric water heater

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