Sunday, January 18, 2015

How to wire 240 volt outlets and plugs


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
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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
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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


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.
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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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


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
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

3 prong 50 amp range

Flush moun  
                                        
50 amp flush outlet  
Buy:                                                       
At Amazon
At Amazon
50 amp flush outlets

Surface mount  

50 amp surface-mount outlet
Buy:
At Amazon

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

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30 amp / 3-prong / dryer 

10 gauge wire for 30 amp

3 prong 30 amp dryer wiring

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

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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

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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

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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
RV power outlet
50 amp RV power outlet/ 120-240 Volt
Buy
50 amp RV power outlet at Amazon
RV power outlets at Amazon

Plug
 Power grip plug
50 amp Power grip plug
Buy:
Power grip at Amazon

Cord 
Power grip 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

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30 amp / 3-prong / RV



Flush mount

30-amp flush outlet
Buy:
At Amazon

Surface mount
 power grip outlet
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
 RV power outlet
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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250 volt outlets


 L6-30 locking plug and outlet       

Buy 3-wire locking/ 120-250 volt
L6-30 locking outlets at Amazon
L6-30 locking plugs at Amazon
_________________________________________________________________________________

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

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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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.
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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in line fuse
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

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Wiring illustrations start here

Dryer and range cords
         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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Wire 240 volt outlet for 120 volt application

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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Window air conditioner Label shows outlet and voltage

Window air conditioner outlet

16 amp draw
Use 12 gauge wire
Wire color does not matter

Window air conditioner box shows voltage and type of plug


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HB114C window air conditioner timer    Appliance timer outlets

240Volt appliance timer

Intermatic HB114 timer for window air conditioner


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250 volt outlets

L6-30 locking plug and outlet    


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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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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



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

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240 Volt outlets and plugs

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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

_________________________________________________________________________________

How to wire 3-phase outlet and plugs

_________________________________________________________________________________

3 pole 4 wire 240 volt wiring

Look for markings on device: X and Y are Hot, G is ground, W is Neutral
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Convert 240Volt without neutral wire from breaker box.
Square D 1000 watt output transformer 
(higt voltage)

Square D transformer
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
_________________________________________________________________________________

How to wire 3-phase outlets and plugs
Cooper phase wiring diagrams
_________________________________________________________________________________

How to wire 600 volt outlet
Leviton 2710


_________________________________________________________________________________


3-phase
_________________________________________________________________________________

How to wire 120 240 volt outlet and plug

Typical single-phase household circuit
Larger image

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How to wire 240 volt outlet and plug

3-phase
Larger image
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How to wire 240 volt outlet and plug

3-phase
Larger image
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How to wire 120 and 240 volt outlet and plug

Typical household circuit
Larger image
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How to wire 480 volt outlet and plug

_________________________________________________________________________________

How to wire 277 volt outlet and plug
_________________________________________________________________________________

How to wire 240 volt outlet and plug

_________________________________________________________________________________

How to wire 120 volt outlet and plug
Typical 120Volt household circuit
Larger image
_________________________________________________________________________________

How to wire 240 volt outlet

Typical 240V houshold circuit
_________________________________________________________________________________

How to wire 120 volt outlet
Typical 120Volt household circuit
_________________________________________________________________________________

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3-phase timers, 3 Phase outlets & surge
______________________________________________________

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Household electricity and switches
_________________________________________________________________________________

circuit breakers are warm
_________________________________________________________________________________

Difference between 120 and 240volts

Troubleshoot household electricity
_________________________________________________________________________________


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How to wire Cooper 277

_________________________________________________________________________________

Pass and seymour TM8113
_________________________________________________________________________________
How to wire switches

How to wire GFCI

How to wire timers
_________________________________________________________________________________

Additional links
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

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
________________________________________________________________________________


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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

 Power pack

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Wire T1906 and T1905 timers
  

Wire T-101 T103 T104 timers 





Wire EH40 and WH40 timers
  






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Intermatic timers
Intermatic GM series

Pool timers and manuals
Intermatic T104P201


Wire GE 15207 timer 



EH10 water heater timer



Tork pool timers


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Gas and electric water heaters


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Resources:How to install gas water heater
Troubleshoot gas water heater
Troubleshoot electric water heater


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Gas and electric water heaters
Industrial electric at Amazon

Industrial supplies at Amazon

Industrial and scientific Amazon


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box timers
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programmable timer
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Countdown timers
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Yard and Christmas timers

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