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You don't say if it is the power line into the house or if it an internal circuit. On interenal circuits use #12 wire with ground. for 20 amp circuits and you can use #18 for 15 amp cuircuits (lights only). I would never use this as #12 isn't that much more costly and all the circuits can run 20 amp. For 30 amp, (water heaters, stove top and ovens use #10 with ground. For power lines into the house the power company will install it and decider the proper wire size. Leonard
| 14 years ago. Rating: 0 | |
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The 18 gauge wire is what you typically find within light fixtures that you connect to the circuit wires that are 14-2conductors.