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How to select twist-on wire connector
Use only 600 volt wire.
Lamp cord, extension cords are not rated 600 volt.
Use copper wire only. Aluminum wire is fire risk and should be avoided or installed by professional.

30 amp breaker use 10 gauge /


Buy:
10-2 gauge/ 30 amp
10-3/ 30 amp
Southwire electric tools
Yellow 12 gauge 20 amp


Yellow/ #12 gauge wire for 20 amp
with ground
Buy:
12-2 gauge/ 20 amp
12-3/ 20 amp

NMB is house wiring
UF is underground
Rolls of stranded wire
White 14 gauge 15 amp


White/ #14 gauge wire for 15 amp
with ground
Buy:
14-2 gauge/ 15 amp
14-3/ 15 amp

NMB is house wiring
UF is underground
armored cable
Buy:
Armored cable
Southwire armored cable cutter
Southwire armored cable cutter
Buy:
Rolls of stranded wire

Stranded wire
stranded wire
Buy:
Rolls of stranded wire
50-60 amp breaker use 6 gauge /
6-2 wire
Buy:
6-2 wire
Southwire electric tools
NMB is house wiring
UF is underground
40-50 amp breaker use 8 gauge /
6-2 wire
Buy:
8-2 wire
Southwire electric tools
NMB is house wiring
UF is underground
    
Copper ground wire
Use same size as other wire in circuit

Buy:
12 gauge copper ground wire
Ground wire
Green ground wire
Ground pigtails
Ground rods/ ground clamps at Amazon

Buy
End cutting nippers at Amazon


When removing insulation from wire, do NOT score or put cuts on surface of copper wire. Doing so increases resistances on wire and creates weak point.
Buy tools:
Wire strippers at Amazon
Linesman pliers
Utility knife at Amazon
multimeter
Buy:
Multimeter
Electrical testers
Steel spring inside each connector
Steel spring cuts into soft copper wire.

Tighter the connector, the stronger steel spring holds wires together.


Buy:
twist connectors at Amazon
Two questions:
Does connector cover past the copper wire? Yes

Is connector tight enough that it will never fall off? Yes

Answer 'yes' to both questions, you have right connector.
Twist connector very tight
          Copper part of wire is completely covered
Applies to wires that are twisted together
Applies to wires that are placed sided-by-side
Applies to stranded and solid wires
connect stranded wire and solid wire How to connect stranded wire and solid wire
If stranded wire is thinner than solid:
Strip back stranded wire so there is more copper visible than solid wire.
Wrap stranded wire around solid copper.
Leave solid wire straight.
When connecting two solids and one stranded: twist solids together first, then wrap stranded wire around solids.
Apply connector very tight.
Pull stranded wire to make sure it is tight.
If stranded wire is same diameter as solid:
Cut off both same length
Don't twist together, cover with connector.
Twisted wire
Basic rules:
               
Wire connectors

Both types do the same job
Twist connectors do not need to be taped in household wiring.
All electrical connections has resistance, and Tape can cause heat build-up that might melt wire connector 
Different wire connectors Choose right size:
Ceiling fans and electric light fixtures from store usually arrive with orange connector.
The orange connector may be too small for connecting to solid wire.
Use Yellow connector instead

Never use connectors for aluminum wire
Always use copper wire. Twist connectors are not approved for aluminum wire applications.
Only specific high compression fittings are used for aluminum wire

Do not use connectors that were used before
Apply new connector each time for high amperage applications

Never expose connections to temperatures higher than 220F
Friction tape
Friction tape
Friction tape: 
Friction tape is best. Plastic tape dries out and comes loose over time.
Do not use twist connector to repair extension cord, appliance cord, or lamp cord. Cut wires back, twist copper wire together, next solder wires, then cover repair with tape.
Friction tape applied over twist connectors:
Commercial electricians know that twist connectors always come loose in high amperage applications, and so they apply friction tape over each connector. However, friction tape can block heat transfer out of connector, causing connectors to melt in some circumstances.

Household electric usage will not experience same high amperage heat found in commercial applications.
Using twist connector without friction tape is fine for household applications.
wire nut safety  Never assume electricity is OFF
Turn power OFF
Always stand on dry boards. 
Do not stand on soil or metal ladder
Electricians use fiberglass ladder
Do not touch or lean into anything made of metal


Never assume power is OFF
Use non-contact voltage tester on timer, on wire, on outlet to see if power is present.
Press button on tester, if single beep then no power is present. If continuous beep then power is present.
Never stand on bare ground, always stand on dry boards, do not hold or touch anything metal when working on timer or water heater that has power, tape tester leads to wood sticks, never touch wet water heater, or flooded water heater, or timer that had a short or fire without turning power OFF.

Buy:
Multimeters at Amazon
Buy non-contact voltage tester at Amazon
Electric testers at Amazon 
Shop Amazon - Industrial and scientific
Shop Amazon - Industrial Electric Products
circuit breaker Circuit breakers
Resources:
Water heater is tripping breaker
How to replace circuit breaker
How to wire gfci
Can AC breaker be used for DC breaker
How to reset circuit breaker
Not enough space for circuit breakers
Circuit breakers
How to install subpanel
Why you need ground wire
Match breaker and wire size
How to wire subpanel
See inside breaker box
How to wire safety switch
How to wire whole house surge protector
Transfer switch
Use twist lock plug for extension cord that plugs into compressor
Install 20 or 30 amp as needed.
X Y terminals go to either Hot, 
W is always Neutral
G is ground
These are standard markings for 240 volt plugs and outlets.
Connect X to one hot busbar inside the transfer switch, connect Y to other hot busbar, ground and Neutral to respective terminals
Buy:
Leviton 2711/ 125-250 volt/ 20-30 amp/ 3 pole
Resources
How to wire subpanel
How to wire transfer switch
how to twist electric wires Linesman pliers
Use to twist wire
Use to cut wire
linesman pliers
Buy:
Linesman pliers

Resources:
How to twist wire
twist two electric wires

Match breaker to voltage that shows on appliance label

3-phase breakers are used for commercial service panels
14 ga wire ++  rated for 120 Volts x 15 Amp = 1800 Watts x 80% = 1440 Watts

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

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

Resources:
Select right wire and breaker
Wire size chart with distances
Electrical formulas
circuit breaker Circuit breaker resources
Resources:
Water heater is tripping breaker
How to replace circuit breaker
How to wire gfci
Can AC breaker be used for DC breaker
How to reset circuit breaker
Not enough space for circuit breakers
Circuit breakers
How to install subpanel
Why you need ground wire
Match breaker and wire size
How to wire subpanel
See inside breaker box
How to wire safety switch
How to wire whole house surge protector

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
When removing insulation from wire, do NOT score or put cuts on surface of copper wire. Doing so increases resistances on wire and creates weak point.
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
main breaker box
Larger image
See inside main breaker box

Basic house wiring
Electricity leaves power plant Resource: Electricity:
The grid is defined by three parts: transmission, distribution and end user. The following links show how it works
Power plant to end user power pole
Power pole to residential breaker box
Power pole to commercial breaker box

How to wire residential electric
How to wire commercial 3-phase

Why you need ground wire
How to wire 3-phase timer
3-phase water heater


Gas and electric water heaters Support the economy:
Buy water heaters  from my associate links:

50 gallon Gas water heaters at Amazon
40 gallon gas water heaters at Amazon
50 gallon Electric water heaters at Amazon
40 gallon electric water heaters at Amazon
Hybrid / heat pump/ water heaters at Amazon

Resources:
How to install gas water heater
Troubleshoot gas water heater
Troubleshoot electric water heater
Gas and electric water heaters Industrial electric at Amazon

Industrial supplies at Amazon

Industrial and scientific Amazon
Intermatic control centers Intermatic control centers:
+ manuals and parts


Including Z-wave
box timers Compare box timers

Control with Z-wave
programmable timer Compare programmable timers

Control water heater with programmable wall timer
Countdown timers Compare countdown timers

Control water heater with countdown timer
Compare power packs
Yard and Christmas timers Yard and Christmas timers
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