Number of receptacles

[gregorsc]

How many duplex receptacles will the NEC allow on a 20a 120v circuit in a doctors office ? DO YOU APPLY THE CONTINUOUS DUTY 125% RULE?

 

[roger]

Re: Number of receptacles

Unless you know the circuit will be loaded more than 16 amps for more than 179 min 59 sec at a time, it is not necessary to calculate for continous duty.

See 220.3(B)(9) for how many receptacles on a circuit.

Roger

 

[infinity]

Re: Number of receptacles

The answer to your question is 13.

 

[john m. caloggero]

Re: Number of receptacles

See 220.14(I) and 220.14(L).

20A x 120V = 2400VA

2400VA divided by 180VA = 13 receptacles

 

[mc5w]

Re: Number of receptacles

Better check your local rules. Parma, Ohio only allows 10 outlets of any kind on a 20 amp circuit. If all of the outlets are LED exit signs then tough. They also ban 15 amp wiring.

For that matter, not using 15 amp wiring simplifies my situation anyways. Only need to remember 1 set of box fills, 1 set of Sctchlok(R) fills, less fragmentation of inventory.

 

[pierre]

Re: Number of receptacles

" Parma, Ohio only allows 10 outlets of any kind on a 20 amp circuit. If all of the outlets are LED exit signs then tough. They also ban 15 amp wiring."

Is this a written code change, or a myth generated and perpetuated in the field?

 

[jimwalker]

Re: Number of receptacles

They must like to waste money.Sure would complicate wiring up layins in a large building.

 

[iwire]

Re: Number of receptacles

Originally posted by jimwalker:
Sure would complicate wiring up layins in a large building.

Good point, using compact florescent fixtures at 277 volt we might have 60 or 80 fixtures on a circuit.

 

[lady sparks lover]

Re: Number of receptacles

I think you could fit 200-300 if you're lucky, but if you turn on the power it won't work!