80 percent of branch circuit rating

[shputnik]

Can someone, kindly, explain the 80 percent of the branch circuit rating? I only found this referring to cord and plug connected outlets and something about 30 amp branch circuits.
Cord and plug branch circuits would not apply to general lighting branch circuits if only lighting was fed from that branch circuit?
So a 20 amp branch circuit for just lighting could have 100 percent used?

Thanks

 

[david luchini]

Can someone, kindly, explain the 80 percent of the branch circuit rating? I only found this referring to cord and plug connected outlets and something about 30 amp branch circuits.
Cord and plug branch circuits would not apply to general lighting branch circuits if only lighting was fed from that branch circuit?
So a 20 amp branch circuit for just lighting could have 100 percent used?

Thanks

See 210.19(A)(1).

 

[ptonsparky]

Try 210.20(A)

 

[ptonsparky]

Take your choice.

 

[kwired]

210.23 Permissible Loads, Multiple-Outlet Branch Circuits.

Sub part (A) is for 15 and 20 amp circuits

(1) Cord-and-Plug-Connected Equipment Not Fastened in Place.
The rating of any one cord-and-plug-connected utilization equipment not fastened in place shall not exceed 80 percent of the branch-circuit ampere rating.

(2) Utilization Equipment Fastened in Place.
The total rating of utilization equipment fastened in place, other than luminaires, shall not exceed 50 percent of the branch-circuit ampere rating where lighting units, cord-and-plugconnected utilization equipment not fastened in place, or both, are also supplied.

this is probably most commonly used/referred to section of that nature.

OP did mention 30 amp circuits - that puts us down the page a little further to (B) which ends with :

A rating of any one cord-and-plug-connected utilization equipment shall not exceed 80 percent of the branch-circuit ampere rating.

Difference is it doesn't mention fastened in place - applies to all cord and plug connected loads to a multiple outlet 30 amp circuit.