Color-code for residential wire <> for easy identification
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10ga for 30 Amp circuits
14ga for 15 Amp circuits
12ga for 20 Amp circuits
Color-code for residential wire <> for easy identification | |||||
| Home waterheatertimer.org Back to DIY Go to: Install water heater timer |
Orange 10ga for 30 Amp circuits |
White 14ga for 15 Amp circuits |
Yellow 12ga for 20 Amp circuits |
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| Household wire is typically NM-B for indoor applications, DU-F for outdoor underground | |||||
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Basic electric formula: Volts x Amps =
Watts ++  for safety,
wires can carry 80% of rated load |
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 NM-B copper wire |
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 |
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 See larger |
 Larger image | Use in-line fuse when connecting 2 different gauge wires 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. Always make connections inside a box with cover See fuseholder |
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