Steel spring cuts into soft copper wire.
Tighter the wire nut, the stronger steel spring holds wires together.
Is nut tight enough that it will never fall off?
Answer 'yes' to both questions, you have right wire nut.
Copper part of wire is completely covered
 Wing Nut Wire nut This site calls both types: 'wire nuts' |
Wing
nuts 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 |
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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 220°F |
 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. |
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
Make installation easy
Twist wire nuts tight
Will not crack wire nut
Linesman pliers can crack wire nut
Ideal wire nuts
Never assume electricity is OFF
Turn power OFFAlways 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
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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. |
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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 Wire size chart with distances Electrical formulas |
