Circuit Breaker Frame Size Chart

Let s start with looking at the order of the calculations.

Circuit breaker frame size chart.

But before you can size the ocpd you have to determine what load it will supply. This means that only an 80 load factor may be used when figuring electrical material needs and is already. F frame circuit breakers with 210 electronic trip unit technology circuit breaker typ e fde hfde fdce numb r of poles 3 3 poles suffix zg zone sel ectiv interlocin g blank no option trip unit 3 ls 32 lsi 35 lsg 36 lsig suffix w ithou erm nals l i ne and load ter m nals b lank l oads id et rm na y t p ampere 80 160 225 fde 3 225 32 w. Having circuit breakers available with smaller dimensions than all the others on the market undoubtedly offers great advantages more space for cabling operations and simpler installation therefore notable savings in time five sizes just two depths 2 76 inches 70 mm for t1 t2 t3 and 4 07 inches 103 5 mm for t4 and t5 and the latter also have the same height.

So sizing the ocpd logically comes before sizing the conductors. Circuit breakers are designed to carry 100 of their rated current while the nec dictates an 80 application. The chart below will help you determine fuse or breaker size and the necessary wire size to service various wattage loads. The overcurrent protection device ocpd whether a breaker or a fuse defines the circuit.

Sizing a circuit breaker.