30-50 amp/ 3-prong/ Range:
10 AWG for 30 amp.
8 AWG for 50 amp
30-50 amp/ 3-prong/ Range:
10 AWG for 30 amp 240 volt.
8 AWG for 50 amp 240 volt
30 amp/ 3-prong/ Dryer: 10 AWG for 30 amp
30 amp/ 3-prong/ Dryer: 10 AWG for 30 amp
30 amp/ 4-prong/ Dryer: 10 AWG for 30 amp
30-50A/ 4-prong/ RV.
Neutral is not needed for 240 volt electric circuit
Neutral wire is usually NOT present in 240V circuit
___________________________________________________________________________________
Typical Household wire ratings
14 ga wire ++ rated for 120 Volts x 15 Amp breaker = 1800 W
1800 Watts x 80% = 1440 Watts
12 ga wire ++ rated for 120 Volts x 20 Amp breaker = 2400 W
2400 Watts x 80% = 1920 Watts
10 ga wire ++ rated for 240 Volts x 30 Amp breaker = 7200 W 7200 Watts x 80% = 5760 Watts
______________________________________________________
Circuit breaker and wire size chart
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.
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Window air conditioner Label shows outlet and voltage
3-Pole, 3-Wire Non-Grounding: 250V
Twist lock generator outlet box wiring
How to wire 3-phase outlet and plugs
Square D 1000 watt output transformer (higt voltage) so on
RV-Dryer Outlets
See More
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
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
Twist Lock
Image shows 2 hot wires with ground.
2 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
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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
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.
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
How to test for 120 volt or 240 volt
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30-50 amp / 3-prong / range
10 gauge wire for 30 amp
8 gauge wire for 50 amp
Flush moun
50 amp flush outlet
Buy:
Plug
50 amp plug
Buy:
At Amazon
Cord
30-50 amp pigtails
Buy:
40 amp at Amazon
30 amp at Amazon
50 amp at Amazon
Profile
30-50 amp
Profile
Nema 6-50
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_________________________________________________________________________________
30-50 amp / 3-prong / range
10 gauge wire for 30 amp 240 volt
8 gauge wire for 50 amp 240 volt
Flush mount
50 amp flush outlet
Buy:
At Amazon
At Amazon
30 amp flush outlets
Surface mount
50 amp surface-mount outlet
Buy:
At Amazon
Surface mount receptacles
Plug
50 amp plug
Buy:
At Amazon
Wire:
10 gauge wire for 30 amp
8 gauge wire for 50 amp
no pigtail/ cord
Profile
30-50 amp
Profile Nema 6-50
_________________________________________________________________________________
30 amp / 3-prong / dryer
10 gauge wire for 30 amp
Flush mount
30 amp flush outlet
Buy:
At Amazon
At Amazon
Surface mount
30 amp surface-mount outlet
Buy:
At Amazon
At Amazon
Plug
30-50 amp plug
Buy:
At Amazon
Wire:
10 gauge wire for 30 amp
no pigtail/ cord
Profile
30 ampProfile Nema 6-30R
_________________________________________________________________________________
30 amp / 3-prong / dryer
10 gauge wire for 30 amp
Flush mount
30 amp flush outlet
Buy:
At Amazon
At Amazon
Surface mount
30 amp surface-mount outlet
Buy:
At Amazon
Plug
30-50 amp Plug
Buy:
At Amazon
Cord
Pigtails
Buy:
30 amp at Amazon
30 amp at Amazon
50 amp at Amazon
Profile
30 amp
Profile Nema 14-30
Nema 10-30R
Neutral is NOT required for 240 Volt circuit
_________________________________________________________________________________
30 amp / 4-prong / dryer
10 gauge wire for 30 amp
Flush mount
30 amp flush outlet
Buy:
At Amazon
Surface mount
30 amp surface-mount outlet
Buy:
At Amazon
NO Plug
use pigtail/ cord on right
Dryer cord 4-prong at Amazon
Cord
Pigtail
Buy:
30 amp at Amazon
30 amp at Amazon
30 amp at Amazon
30 amp at Amazon
4-5-6-10 foot 30 amp
Profile
30 amp
Neutral is NOT required for 240 Volt circuit
_________________________________________________________________________________
50 amp / 4-prong / RV
120 volt and 240 volt
Flush mount
30-50 amp flush outlet
Buy:
At Amazon
Surface mount
50 amp surface-mount outlet
Buy:
At Amazon
At Amazon
Plug
50 amp Plug
Buy:
At Amazon
Power grip at Amazon
Cord
Pigtail
Buy:
50 amp at Amazon
50 amp pigtail to 30 amp
30 amp pigtail to 50 amp
50 amp 4-5-6 foot
Profile
50 amp
and see more...50 amp / 4-prong / RV
120 volt and 240 volt
Surface mount
50 amp RV power outlet/ 120-240 Volt
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50 amp RV power outlet at Amazon
RV power outlets at Amazon
Plug
50 amp Power grip plug
Buy:
Power grip at Amazon
Cord
50 amp Power grip RV extension cord
Buy:
50 amp at Amazon
50 amp at Amazon
RV extension cords
50 amp pigtail to 30 amp
30 amp pigtail to 50 amp
Profile
50 amp
_________________________________________________________________________________
30 amp / 3-prong / RV
Flush mount
30-amp flush outlet
Buy:
At Amazon
Surface mount
30 amp Power grip outlet
Buy:
Power grip at Amazon
Plug
30 amp Power grip plug
Buy:
Power grip at Amazon
Power grip at Amazon
Power grip plugs Amazon
Cord
30 amp Power grip RV extension cord
Buy:
30 amp at Amazon
RV extension cords
Profile
30 amp
Surface mount
30 amp RV power outlet/ 120-240 Volt
Buy
30 amp RV power outlet at Amazon
RV power outlets at Amazon
Cord
Different plug to different plug
30 amp adapter to 30 amp
50 amp adapter to 30 amp
30 amp adapter to 50 amp
Profile
30 amp
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30 amp
Power grip at Amazon
50 amp pigtail to 30 amp
_________________________________________________________________________________
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Neutral wire is usually NOT present in 240V circuit
Add black tape if white wire carries voltage
Neutral is not needed for 240 volt electric circuit
Neutral wire is usually NOT present in 240V circuit
Add black tape if white wire carries voltage
Plug or outlet with 3 Hot wires X Y Z is for 3-phase illustrated lower on page
_________________________________________________________________________________
Circuit breaker and wire size chart
Calculate correct wire and breaker
Electrical calculation1) 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
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Larger image
Cetting 120 V from 240 V/ 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.
Fuseholders at Amazon
Fuseholder 15 amp 125 volt at Amazon
125Volt 15 amp fuseholders at Amazon
_________________________________________________________________________________
Wiring illustrations start here
 |
| 10-3 dryer 10-3 with 6-2 range 6-2 with ground cord ground dryer cord no 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 |
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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
240Volt outlet at Amazon
240Volt outlet at Amazon
240Volt outlet at Amazon
240Volt outlet at Amazon
240Volt plug
_________________________________________________________________________________
Window air conditioner Label shows outlet and voltage
16 amp draw
Use 12 gauge wire
Wire color does not matter
Window air conditioner box shows voltage and type of plug
Buy:
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
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
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240Volt appliance timer
Intermatic HB114 timer for window air conditioner
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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.
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.
Notice that X and Y are Hot, W is Neutral, and there is no G for ground.
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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.
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
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
_________________________________________________________________________________
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
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
_________________________________________________________________________________
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.
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.
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
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 |
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_________________________________________________________________________________
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
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
_________________________________________________________________________________
How to wire 3-phase outlet and plugs
_________________________________________________________________________________
Look for markings on device: X and Y are Hot, G is ground, W is Neutral
_________________________________________________________________________________
_________________________________________________________________________________
_________________________________________________________________________________
Convert 240Volt without neutral wire from breaker box.
Square D 1000 watt output transformer
(higt 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
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
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How to wire 3-phase outlets and plugs
Cooper phase wiring diagrams
_________________________________________________________________________________
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
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
_________________________________________________________________________________
Typical single-phase household circuit
Larger image
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3-phase
Larger image
Larger image
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3-phase
Larger image
Larger image
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Typical household circuit
Larger image
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Typical 120Volt household circuit
Larger image
Larger image
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Typical 240V houshold circuit
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Typical 120Volt household circuit
_________________________________________________________________________________
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3-phase timers, 3 Phase outlets & surge
______________________________________________________
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_________________________________________________________________________________
Household electricity and switches
_________________________________________________________________________________
_________________________________________________________________________________
Difference between 120 and 240volts
Troubleshoot household electricity
_________________________________________________________________________________
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How to wire Cooper 277
_________________________________________________________________________________
_________________________________________________________________________________
How to wire switches
How to wire GFCI
How to wire timers
_________________________________________________________________________________
Additional links
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
________________________________________________________________________________
_________________________________________________________________________________
Intermatic box timers:
How to set box timers
Troubleshoot box timers
Trippers and parts
Intermatic GM series
_________________________________________________________________________________
Intermatic trippers and parts
Dayton
Power pack
Sprinkler timersWire T1906 and T1905 timers
Wire T-101 T103 T104 timers
Wire EH40 and WH40 timers
_________________________________________________________________________________
Intermatic timers
Pool timers and manuals
Wire GE 15207 timer
EH10 water heater timer
Tork pool timers
_________________________________________________________________________________
_________________________________________________________________________________
________________________________________________________________________
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Troubleshoot electric water heater
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Industrial supplies at Amazon
Industrial and scientific Amazon
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