Splicing 12ga and 14ga together?

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Old 05-05-14, 04:45 PM
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Splicing 12ga and 14ga together?

I ran a chain of 5 outlets for a workshop using 12ga wire, the very last outlet on the chain will be switched and used only for fluorescent lighting. Given the high cost of wire can the switch leg only be run using 14ga?

Also
Am i correct in understanding that 15amp receptacles and switches are for use only with 14ga wire and 20amp for use only with 12ga wire?
Is this a hard line rule or can a 15a duplex outlet be used in a 12ga run when it will only see light duty, lamps etc. providing you wire to and not through the chained outlets? I assume there is no harm in using a 20a receptacle on a 14g wire run?

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Old 05-05-14, 05:16 PM
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If that #12 circuit is protected by a 20A circuit breaker...... then all wiring in that circuit needs to be #12.

You can use 15A devices on #12 wiring.
 
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Old 05-05-14, 05:44 PM
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Also while it is not against NEC, it is generally considered bad practice to put lighting on receptacle circuits.
 
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Old 05-05-14, 07:17 PM
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I assume there is no harm in using a 20a receptacle on a 14g wire run?
As PJ posted, you can use 15 amp devices on a 20 amp circuit/#12 wiring. You may not use 20 amp devices on a 15 amp circuit/#14 wiring.
 
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Old 05-05-14, 08:25 PM
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Originally Posted by Tolyn Ironhand View Post
you can use 15 amp devices on a 20 amp circuit/#12 wiring.
While we can do this in the States, our friends in Canada need to ignore this.. CEC calls for 20A T-slot receptacles on non-dedicated 20A circuits..
 
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