FreeAtLast
Member
Good afternoon,
Does anyone know if a circuit containing 3 Kinetix 5500 drives (& their motors) is considered a Motor Branch Circuit according to NEC 430?
My design steps for Motor Branch Circuits would be:
Alternatively, for a Non-Motor Branch Circuit:
But a branch circuit with 3 servo drives (in series) and their motors seems to be a hybrid of the two types of circuits. I heard somewhere that you just disregard the motor FLC and use the Amp rating of the drives for determining the load. But I haven't gotten any good information on which of the two code sections I should be using for conductor ampacity or circuit protection. Should I be in the NEC[430.xx] section or the NEC[2XX.X]-[3XX.X]?
Thanks for any clarification!
Does anyone know if a circuit containing 3 Kinetix 5500 drives (& their motors) is considered a Motor Branch Circuit according to NEC 430?
My design steps for Motor Branch Circuits would be:
- Determine FLC of motor from NEC[430.150]
- Determine conductor size/ampacity using [430.22]
- Size motor overload relays
- Size motor branch circuit short circuit and ground fault protective device using [430.52]
Alternatively, for a Non-Motor Branch Circuit:
- Add up the load
- Determine conductor size/ampacity using [310.15,16] and [210.19]
- Size branch circuit short circuit and ground fault protective device using [210.20(A)] and [240.4(D)]
But a branch circuit with 3 servo drives (in series) and their motors seems to be a hybrid of the two types of circuits. I heard somewhere that you just disregard the motor FLC and use the Amp rating of the drives for determining the load. But I haven't gotten any good information on which of the two code sections I should be using for conductor ampacity or circuit protection. Should I be in the NEC[430.xx] section or the NEC[2XX.X]-[3XX.X]?
Thanks for any clarification!