Receptacle Limits on a brach circuit per NEC
Receptacle Limits on a brach circuit per NEC
(OP)
I am missing something in the NEC. #220.3.B.9 states that for a 20A circuit they allow 13 receptacles. This is only if they allow the breaker to be loaded 100%. I thought I had to size the breaker to 125% of the load or limit the load to 80% of the breaker. By this method, the limit is 10 for a 20A circuit. I must me missing an exeption; can anyone point it out? (I am dealing Industrial, but what about commercial/Residential?)
Regards
Regards






RE: Receptacle Limits on a brach circuit per NEC
In fact there is no limit by NEC as to how many repectacels you can put on a circuit. The requirement is that if there are more than two receptacles on a circuit, the receptacle ratings shall not be less than requried by NEC table, 210.21.B.3
Refer to 210.21 and 210.23.A.1 also. It is up to the desinger to make sure, within reasons, that at a given time the circuit will not be overloaded.
RE: Receptacle Limits on a brach circuit per NEC
A 20 amp circuit at 180 VA per receptacle the maximum number of duplex receptacles that can be connected to one circuit is (120*20)/180 = 13.333.
Good design practice is to know the loads and circuit the receptacles accordingly.
RE: Receptacle Limits on a brach circuit per NEC
RE: Receptacle Limits on a brach circuit per NEC
As for Dwellings- the 180 va per receptacle does not apply. It is figured into the general lighting load calc. But, most local codes use the 10 outlet rule anyway for 20 amp circuits.
There is a lot of different views about this section. Check with your local building department plan check or inspection for their version.
RE: Receptacle Limits on a brach circuit per NEC
RE: Receptacle Limits on a brach circuit per NEC