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2014

How to select right wire nut ... wire nut basics:

Steel spring inside each wire nut

Steel spring cuts into soft copper wire.

Tighter the wire nut, the stronger steel spring holds wires together.


Buy:
Wire nuts at Amazon
Does wire nut cover past the copper wire?
Is nut tight enough that it will never fall off?

Answer 'yes' to both questions, you have right wire nut.
      Twist wire nut very tight

Copper part of wire is completely covered

wire nut assortmentBuy
Wire nut assortment at Amazon
Do not reuse wire nuts
Discard used wire nuts
               
Wing Nut                     Wire nut

This site calls both types: 'wire nuts'
Wing and wire nuts do the same job
Wire nuts 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 nut
Different wire nuts Choose right size:
Ceiling fans and electric light fixtures from store usually arrive with orange wire nut.
The orange wire nut may be too small for connecting to solid wire.
Use Yellow wire nut instead

Never use wire nuts for aluminum wire

Always use copper wire. Wire nuts are not approved for aluminum wire applications.
Only specific high compression fittings are used for aluminum wire

Do not use wire nuts that were used before
Apply new wire nut each time for high amperage applications

Never expose wire nut 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 wire nut 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 wire nuts:
Commercial electricans know that wire nuts always come loose in high amperage applications, and so they apply friction tape over each wire nut. However, friction tape can block heat transfer out of wire nut, causing wire nuts to melt in some circumstances.

Household electric usage will not experience same high amperage heat found in commercial applications.
Using wire nut or wing nut without friction tape is fine for household applications.
Weatherproof wire nut Underground and 'weatherproof' wire nuts
Use this type wire nut in outdoor boxes, wet and damp applications, underground boxes

Nothing is completely weatherproof.

Do it yourself weatherproof wire nut
Fill wire nut with silicone caulk and then apply wire nut over twisted wires. Wires must be twisted together before applying silicone-filled wire nut
Wire nut wrench Wire nut wrench
Make installation easy
Twist wire nuts tight
Will not crack wire nut
Linesman pliers can crack wire nut

Ideal wire nuts

Use push-on wire connectors in place of wire nuts/ (more expensive alternative)

Buy:
Push on wire connectors at Amazon
Red 3P connector (shown) for 10-14 gauge wire
Push on wire connectors
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


how to twist electric wires
twist two electric 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 wire nut 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 wire nut.
Twisted wire

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

Select right wire and breaker
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Electrical formulas

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Cutler Hammer C25BUB230A
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Resources:
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