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How to wire twist lock plugs
Also see:
How to wire 240 volt straight blade plugs
How to wire 240 volt outlets

Multimeter

Test for breaks in wire/ Test for voltage
Most appliance require 80% rated voltage to function correctly
Buy
Multimeters at Amazon
Electric testers at Amazon
Resource:
How to test and replace element
How to test thermocouple
Element tests for 120 volts
How to test wire
Safety when testing wires:
Never touch wet or previously flooded appliance.
Never stand on wet surface when working on electric.
Never stand on bare soil, put down dry boards.
Tape tester leads to wood sticks to keep hands away from power.
Use non-contact voltage tester before touching wires.
Never touch or lean into any made of metal.
Remove metal objects from pockets.
Do not use oxygen or fuel accelerants in same room as electrical repairs

Resource:
Basic house wiring

Non-contact voltage tester

Test for power without touching connectors
NEVER assume power is OFF
Buy:
Non-contact voltage tester Amazon
Electric testers at Amazon
Resource:
How to test electric power is off
wire connector assortment

Twist-on wire connector assortments

Do not reuse old connectors
Buy:
Connector assortment at Amazon
Connector assortment at Amazon
Resource
How to select and install twist-on wire connectors
Weatherproof wire connector

Weatherproof wire connector

Connector cavity is full of silicone
Built-in cover keeps silicone in place
Protect from water, dust etc
Buy from my affiliate links
Weatherproof size 14 to 6 Amazon
Weatherproof size 22 to 8 Amazon

Resource
How to select and install connectors
Wire connector wrench
Wrench to apply wire connectors
Tighten connector

Buy:
Wire connector blaster
Twist connector wrenches at Amazon

Resources:
How to twist wire
How to select and install twist-on wire connectors

Buy:
Blue for 16-14 wire
Yellow for 12-10 wire

Resource:
How to install terminals
Treminals

Terminals

Buy:
Terminal kit
Blue for 16-14 wire
Yellow for 12-10 wire
Push on wire connectors

Push-on wire connectors in place of twist-on connectors

Buy:
Push on wire connectors Amazon
Red 3P connector for 10-14 gauge wire
Lever connectors for stranded wire at Amazon
remove cable staple
Buy
End cutting nippers at Amazon

 
linesman pliers
Buy tools:
Wire strippers at Amazon
Linesman pliers
Utility knife at Amazon
End cutting nippers at Amazon

Use solid copper wire
Fire inside timer caused by stranded wire
Keep enclosure door closed at all times
Buy:
soldering guns
Resource

Timer caught fire
How-to-wire-240Volt outlet and plug
Larger image
Single-phase 120-240 volt twist-lock outlet or connector is marked X-Y-W-G or X-Y-G
120V and 240V requires 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, depending on end-user application.
Resources:
See inside main box
Figure volts amps watts
Select correct wire and breaker
Electrical formulas

Z is used for 3-phase and not shown here.
Commercial 3-phase outlet is marked X-Y-Z-G or X-Y-Z-W-G
Resource:
How to wire 3-phase
wire 240 Volt outlet10-3 wire1) Look for voltage and amp rating.
Each load and wiring device will have identifying markings that show volts and amps.

2) Look letters on wiring device
X and Y are for Hot wires, and G is for ground, W for Neutral

3) Pay attention to screw color
 Brass colored screw for Hot. Silver for Neutral . Green for ground. 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

4) Notice shape of blade slots:
The ground blade has different shape.
Nema locking devicesLarger image
NEMA / locking devices
480V 3 ... 3 means 3-phase voltage
3Y ... 3-phase wye
GR ... ground
277V, 480V, 347 and 600V are derived from 3-phase commecial service and not available for household wiring

Resource:
Select correct wire and breaker size
GE-Breakers

Buy circuit breakers
Eaton CL series circuit breaker
CH circuit breakers at Amazon
Federal Pacific circuit breaker
QO circuit breakers at Amazon
double-pole breaker
Buy circuit breakers
Choose from 15 to 125 amp
Siemens circuit breaker
GE circuit breakers at Amazon

Resource:
Select correct wire and breaker size
Not enough space for circuit breakers
125-240 volt 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 terminal 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/ 30 amp

Resources:
Locking plug Wiring diagrams
Locking connectors
Locking connectors
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
✅✓

L7-15R 277 volt
Locking receptacles


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
Combination twist lock/ straight blade
Leviton 4792Larger image

Leviton 4792
Common feed:
Max amperage on total outlet 15A.
18-10 AWG Brass 8-32

Buy:
4792/ 15 amp 125 volt
Leviton 4792Larger image

Leviton 4794 and 4795
Split feed:
Use 2 separate wires. 18-10 AWG
Max amperage on each outlet 15A.

Buy:
4794/ 15 amp/ split 125 volt
2 Hot Feeds and 2 Neutral Returns
Buy:
4795/ 15 amp/ split 125 volt
2 Hot Feeds and 1 Neutral Return
Generator twist-lock connection
Generator outlet 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

Resources:
How to wire transfer switch
How generator works
Connect water heater to generator
277-480-600 volt/ 3-wire
277 volt locking receptacle 277 volt locking receptacle
277 volt is derived from 3-phase 480-277 service.
One Hot leg and a Neutral wire are pulled from the breaker box to create 277 volt potential
Extreme danger from high voltage 480-277, wiring should be done by licensed electrician
Buy:
Connectors
L7-15R 277 volt 15 amp
L7-20R 277 volt 20 amp    
L7-30R 277 volt 30 amp
Outlets
Leviton 4760  15A
Leviton 2330  20A
Leviton 2630  30A
Resources:
What is 277 volt
How to wire 3-phase
Difference single-phase and 3-phase
How to wire 277 volt outlet and plug


Note size difference
.
Amperage is heat.
L7-20R has same blade configuration as higher-amp L7-30R, but 30 amp size is larger than 20 amp to handle greater heat on wire.
L8 480 volt locking receptacles 480 volt locking receptacles
480 volt is derived from 3-phase 480-277 service.
Two Hot legs are pulled from the breaker box to create 480 volt potential
Extreme danger from high voltage 480-277, wiring should be done by licensed electrician.
Buy:
Connectors
L8-20R 480 volt 20 amp    
L8-30R 480 volt 30 amp
Outlets
Leviton 2340  20A
Leviton 2640  30A
Resources:
How to wire 3-phase
Difference single-phase and 3-phase
2460 20 amp 247-600V
How to wire 480 volt outlet and plug480 volt 3-wire with Ground
L12 480 volt 3-phase locking receptacle 480 volt 3-phase 3 locking receptacle/ non-grounding
480V 3 ... 3 means 3-phase
480 volt is derived from 3-phase 480-277 service.
Three Hot legs are pulled from the breaker box to create 480 volt potential
Extreme danger from high voltage 480-277.
Buy:
Connectors
L12-20R 480 volt 20 amp    
L12-30R 480 volt 30 amp
Outlets
Leviton 2380  20A
Leviton 2860  30A
Resources:
How to wire 3-phase
Difference single-phase and 3-phase
What is 3-phase
480 volt 3 Non-grounding
Leviton 2710 600 volt 3-phase 3 locking receptacle/ grounding
600V 3 ... 3 means 3-phase
600 volt is derived from 3-phase 600-347 volt service.
Three Hot legs are pulled from the breaker box to create 600 volt potential
Extreme danger from high voltage 600.

Buy:
Connectors
L17-30 600 volt 30 amp
Hubbell L17-30
Outlets
Leviton 2740
Hubble 2740
2460 20 amp 247-600V
How to wire 600 volt outlet600 volt 3 with Ground
L20 347-600 volt 347-600 volt 3-phase 3 locking receptacle/ non-grounding
Three Hot legs are pulled from the breaker box to create 3 600 volt potential.
One Hot leg + Neutral wire creates single-phase 277 volt potential.
Extreme danger from high voltage 347-600V.
When device is not grounded, the enclosure and conduit are ground. The equipment must be grounded.

Buy:
Connectors
L20-30 600 volt 30 amp
Hubbell L20-30 20 amp
Hubbell L30-30 20 amp
2461 20 amp plug
2771 30 amp plug
2773 connector    2463
Outlets
Leviton 2770
Hubble 2770
2460 20 amp 347-600V
347-600V 3 non-grounding

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