have been reading Article 430 of the code and came to the section of Motor feeder short circuit and ground fault protection.
Something has puzzled me in 430.62 (a). What I am not understanding is how this code applies to the number of motors that the feeder will have on it along with specific of 440. 22 (a).
What I am trying to say is; Does the sum of 440.22(a) need to be added to the sum of the largest rating or setting of the branch-circuit shor circuit and groundfault protection device plus the sum of the full load currents?
I am rather confused.
As an example:
Determine the minimum required branch-circuit short-circuit and ground fault protection and the feeder protection for 3-2hp 230v 1ph, 4-3/4hp 230v 1 ph motors; 5-208/230v Pool heater with hermatic compressors and 37 amp load current each. And how about putting 8-300 watt pool transformers with the pool equipment panel along with 35 step lights each with 2amps of operating current each. On a 208v 3ph 4wire feeder.
I am using a real installation for an example. Any help with understand the code requirements of properly sizing the feeders for the panel and protection is greatlyh appreciated.
Something has puzzled me in 430.62 (a). What I am not understanding is how this code applies to the number of motors that the feeder will have on it along with specific of 440. 22 (a).
What I am trying to say is; Does the sum of 440.22(a) need to be added to the sum of the largest rating or setting of the branch-circuit shor circuit and groundfault protection device plus the sum of the full load currents?
I am rather confused.
As an example:
Determine the minimum required branch-circuit short-circuit and ground fault protection and the feeder protection for 3-2hp 230v 1ph, 4-3/4hp 230v 1 ph motors; 5-208/230v Pool heater with hermatic compressors and 37 amp load current each. And how about putting 8-300 watt pool transformers with the pool equipment panel along with 35 step lights each with 2amps of operating current each. On a 208v 3ph 4wire feeder.
I am using a real installation for an example. Any help with understand the code requirements of properly sizing the feeders for the panel and protection is greatlyh appreciated.
