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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

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
Your outlet might not have neutral wire.
Neutral not required for 240volt circuit

How to identify ground connection:
Look For green screw
Round shapes with flat bottom are ground
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:
How to identify ground connection on twist-lock devices:
Look For green screw
The rounded L shape is ground in all 120V, 277V and 240V volt applications

Inside main breaker box
Larger image

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
Flush mount Surface mount Plug Cord Profile

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50 amp plug
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30-50 amp pigtails
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30 amp at Amazon
50 amp at Amazon

30-50 amp
Profile
Nema 6-50

30-50 amp/ 3-prong/ range

10 gauge wire for 30 amp
8 gauge wire for 50 amp

3 prong 50 amp range

50 amp flush outlet
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30 amp flush outlets

50 amp surface-mount outlet
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Surface mount receptacles

50 amp plug
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Wire:
10 gauge wire for 30 amp
8 gauge wire for 50 amp

no pigtail/ cord

30-50 amp
Profile Nema 6-50

30-50 amp/ 3-prong/ range

10 gauge wire for 30 amp 240 volt
8 gauge wire for 50 amp 240 volt


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30 amp surface-mount outlet
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30-50 amp plug
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10 gauge wire for 30 amp
no pigtail/ cord

30 ampProfile Nema 6-30R

30 amp/ 3-prong/ dryer

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

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30-50 amp Plug
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Pigtails
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30 amp
Profile Nema 14-30
Nema 10-30R

Neutral is NOT required for 240 Volt circuit

30 amp/ 3-prong/ dryer

10 gauge wire for 30 amp

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Neutral is NOT required for 240 Volt circuit

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10 gauge wire for 30 amp

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120 volt and 240 volt


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Different plug to different plug
30 amp adapter to 30 amp
50 amp adapter to 30 amp
30 amp adapter to 50 amp

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50 amp pigtail to 30 amp
250 volt outlets   L6-30 locking plug and outlet      
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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
Larger image

Neutral is not needed for 240volt electric circuit


Neutral wire is usually NOT present in 240V circuit


Add black tape if white wire carries voltage

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.
DIY Resource:
Select correct wire and breaker
Electrical formulas
Figure volts amps and watts

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
in line fuse
Larger image

Getting 120 Volt from 240 Volt / possible if neutral wire is present

Illustration shows how to draw 120V from 240Volt line.
Only possible by code if 240Volt line has neutral wire.
These connections must be put inside enclosed box with cover.

Connect 12 gauge wire to 10 gauge wire.
Illustration shows smaller 12 gauge wire connected to larger 10 gauge wire.

10 gauge wire is protected by 30 amp breaker
The amp draw on 30 amp breaker is too large for 12 gauge wire.
12 gauge wire should have 20 amp breaker.

Use busman fuseholder with 20 amp fuse.
Fuse will protect entire length of 12 gauge wire.
Connect fuse to Hot wire.
Not necessary to put fuse on Neutral

If the 12 gauge wire was wired for 240V, then fuse is necessary for both hot wires.

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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
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Range cords 40-50 amp at Amazon
Wire 240 volt outlet for 120 volt application
Larger image
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.

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240Volt outlet at Amazon
240Volt outlet at Amazon
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240Volt plug

Window air conditioner outlet

Window air conditioner box shows voltage and type of plug

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All Intermatic timers
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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.
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
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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
240 Volt outlets and plugs
Larger image
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

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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
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

Larger image Straight-blade


Larger image
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 X
2 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
http://waterheatertimer.org/How-to-wire-Intermatic-CA3750.html

How to wire 3-phase outlets and plugs

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

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
How to wire 120 and 240 volt outlet and plug
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 houshold circuit
Larger image
How to wire 120 volt outlet

Typical 120Volt household circuit
Larger image

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
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 EJ500 Utilitec Tork ST01C  ST01C UPM Aube T1032Aube Intermatic EI500Intermatic
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Brinks timer Brinks
Westek TE06WHB Woods  Power pack
Timex
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Westinghouse
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Woods 49028
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Power strips
3-phase timer
3-phase timer
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


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