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#42304 - 09/18/04 05:04 PM 15A receptacle
RobbieD Offline

Registered: 02/23/03
Posts: 238
Loc: Canada
I have a 15A breaker supplying a 15A 120V receptacle. I have a power tool plugged into the receptacle and it draws 13A. It occasionally trips the breaker on start-up or when it is loaded down. I am planning to change the breaker to 20A. The wire is good for this but my question is- Do I have to change the duplex receptacle to a 20A 120V also? I think that I do because the receptacle would be able to provide more than 15A. Am I right? Thanks!

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#42305 - 09/18/04 05:40 PM Re: 15A receptacle
PCBelarge Offline

Registered: 06/08/03
Posts: 657
Loc: Dobbs Ferry, NY, USA
If this breaker is supplying a single receptacle, than the receptacle has to be rated the same as the branch circuit that supplies it (210.21(B)(1).

210.21(B)(3) Table - shows that a 15 ampere rated receptacle can be supplied by a 20 ampere circuit. Provided there is more than one receptacle on that circuit.

Remember that a 20 ampere circuit requires a 12 AWG conductor. See 240.4(D).


[This message has been edited by PCBelarge (edited 09-18-2004).]
Pierre Belarge

#42306 - 09/18/04 05:45 PM Re: 15A receptacle
Electric Ian Offline

Registered: 02/10/04
Posts: 132
Loc: MA, USA
Single Receptacle on an Individual Branch Circuit.
A single receptacle installed on an individual branch circuit shall have an ampere rating not less than that of the branch circuit.

#42307 - 09/18/04 06:09 PM Re: 15A receptacle
Electric Eagle Offline

Registered: 04/20/02
Posts: 928
Loc: Alpharetta, GA
If the 15amp receptacle is a duplex, it is considered 2 receptacles and is allowed on a 20 amp circuit.

#42308 - 09/18/04 07:29 PM Re: 15A receptacle
russ m Offline

Registered: 02/22/03
Posts: 165
Loc: Burbank,IL,USA
210.21 would require the use of a 20amp device.

I guess this answer is just redundant.

[This message has been edited by russ m (edited 09-18-2004).]

#42309 - 09/18/04 10:38 PM Re: 15A receptacle
frank Offline

Registered: 05/29/01
Posts: 361
Loc: windsor ontario canada
According to my CCS inspector the receptical must be rated for the breaker size.Started in the 98 code book i think.A T-slot recpiical rated at 20 amps is the only device they allow here in Ontario and its all you can do if you want to use 15a rated equipment on a 20a circuit.This is for Canada and i knew from the question you were another Canuk. Also at 80% rating 12 amps is the max allowable current draw on a 15 amp breaker according to code so the tool should be factory wired with 20A cord cap if its CSA.

[This message has been edited by frank (edited 09-19-2004).]

#42310 - 09/19/04 07:35 AM Re: 15A receptacle
Active 1 Offline

Registered: 02/22/03
Posts: 684
Loc: Grayslake IL, USA
It was my understanding that 210-21 refers to a SINGLE receptical not a DUPLEX receptical. Single = 1 receptical, duplex = 2 recepticals. I guess it is also a local interpitation thing.

I'm for 20A recepticalss on all 20A circuits. I would spend the extra $1 or so because you are getting a better device.


#42311 - 09/19/04 07:40 AM Re: 15A receptacle
RobbieD Offline

Registered: 02/23/03
Posts: 238
Loc: Canada
Thanks guys! I will replace the breaker and receptacle both will be 20A.

#42312 - 09/19/04 08:07 AM Re: 15A receptacle
CJS Offline

Registered: 09/16/04
Posts: 35
Loc: Sanford,NC, USA
One more thing (I don't know if anyone said this or not):

Your max load on a 15A circuit is 80% or 12A. If you exceed that, the breaker will likely trip (or even if you get close to 12A).
Your max load on a 20A crkt is 16Amps.

This is a general rule and some exceptions can apply.

What you are doing is providing 125% for continuos duty (longer than 3 hours) and also you are building in a safety precaution by only going 80% as required in art. 220.

Anything at or near 12A requires a 20A circuit.

#42313 - 09/19/04 09:24 AM Re: 15A receptacle
Ron Offline

Registered: 03/13/02
Posts: 577
Loc: White Plains, NY
CJS, a good reference to backup your theory is 210.23(A)(1)

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