I"m rewiring a a tiny part of a wall and I"m confused around a combination of the NEC and the assets that I"m able to uncover.

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I"m working on a 20 amp circuit (with 12g wire of course). I"m connecting 4 receptacles each in their very own box, 15 amp receptacles for normalcy. But the terminals do not seem to accept 12g wire, even on the screws. My first reaction was to make pigtails 14g pigtails, so that the 14g tap goes straight to the receptacle and is not supplied to feed the rest of the circuit. 12g in package, 12g out of package, and 14g inside package just.

Is that type of splice allowed, or need to I look harder for a 15 amp outlet that can more quickly accept 12g wire?


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edited Feb 16 "16 at 4:49
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Grant
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asked Feb 1 "14 at 4:28
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andyortliebandyortlieb
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I would say 14 gauge wire everywhere on a 20 amp circuit is not OK. The purpose of the breaker is to reduced off power before the wiring overheats. If you plug in several devices on an outlet that total 20 amps, you will exceed the safe working capacity of the 14 gauge wire without tripping the breaker. (You may be under 15 amp for each individual outlet but between the 2 outallows on a duplex receptacle you can exceed the 15 amp rating of 14 gauge wire).

12 gauge wire is a tiny tougher to job-related through yet I"ve never before had a lot of a trouble gaining it attached to outlets. (Working via the added stiffness & bulk in the junction box is the issue I"ve commonly noticed.) However before, probably you deserve to pick up some 20 amp receptacles, even if you do not anticipate using any 20A appliances? Obviously a 20A receptacle needs to assistance 12GA wiring...


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answered Feb 1 "14 at 5:15
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HankHank
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National Electrical Code 2008

Post 210 Branch Circuits

II. Branch-Circuit Ratings

210.19 Conductors — Minimum Ampacity and also Size.

(A) Branch Circuits Not More Than 600 Volts.

(2) Multioutlet Branch Circuits. Conductors of branch circuits giving even more than one receptacle for cord-and-plug linked portable lots shall have an ampacity of not less than the rating of the branch circuit.

Which indicates in your instance, you"ll have to usage 12 AWG conductors for attaching the receptacle.note: A duplex receptacle actually counts as 2 receptacles according to NEC

However before, there are instance were 14 AWG conductors can be offered on a 20 ampere circuit.

(4) Other Loads. Branch-circuit conductors that supply lots other than those mentioned in 210.2 and also other than cooking appliances as spanned in 210.19(A)(3) shall have actually an ampacity enough for the tons served and also shall not be smaller sized than 14 AWG.

Exception No. 1: Tap conductors shall have an ampacity sufficient for the load offered. In addition, they shall have actually an ampacity of not much less than 15 for circuits rated less than 40 amperes and not less than 20 for circuits rated at 40 or 50 amperes and also just wbelow these tap conductors supply any of the adhering to loads:(a) Individual lampholders or luminaires via taps extfinishing not much longer than 450 mm (18 in.) past any percent of the lampholder or luminaire.(b) A luminaire having tap conductors as provided in 410.117.(c) Individual outallows, other than receptacle outallows, with taps not over 450 mm (18 in.) lengthy.(d) Infrared lamp industrial heating appliances.(e) Nonheating leads of deicing and also snow-melting cables and also mats.

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Push in #14 CU solid wire for 15A branch circuit just.

Installation Screw Terminal > #14 - #12 AWG CU Wire Only.

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Notice on the ago of this 125V 15A duplex receptacle, it says that you deserve to usage 14 AWG or 12 AWG copper wire once terminating at the screw terminals, but that 14 AWG copper have to be offered as soon as terminating at the push in terminals. It also claims that if you"re utilizing the press in terminal, and also 14 AWG copper, it can only be offered on a 15 ampere circuit. If you"re installing this on a 20 ampere circuit, via 12 AWG wire, you"ll have to usage the screw terminals.