OCPD Pump

[mto12345]

Good afternoon,

To size an overcurrent protection device for a pump @ Rated voltage 208V, Rated Current 11.9A, and Staring current 76.8A. Should the starting current be used for sizing OCPD or the Rated current. I thought are if you use the rated current, the device would trip every time you start the pump. Also to account for the load (wattage) on the panel schedule, which current (Staring or Rated )should be used.

 

[augie47]

IIn most cases You should size the GFSC protection from Tables. See 430.6, Tables 430.247-251 & 430.52
Overload protection should be size from the nameplate. See 430.32

 

[Dennis Alwon]

Motor overcurrent protective device are based on percentage of the value from T.430.248, .249, .250. That percentage is determined by T. 450.52

 

[mto12345]

Motor overcurrent protective device are based on percentage of the value from T.430.248, .249, .250. That percentage is determined by T. 450.52

View attachment 2562896

Thank you

 

[mto12345]

IIn most cases You should size the GFSC protection from Tables. See 430.6, Tables 430.247-251 & 430.52
Overload protection should be size from the nameplate. See 430.32

Thank you

 

[infinity]

Are you asking about motor overload or overcurrent protection? There are two different sets of answers in this thread.

 

[mto12345]

Are you asking about motor overload or overcurrent protection? There are two different sets of answers in this thread.

I am asking about the circuit breaker needed for the panel to isolate the fault

 

[Little Bill]

There are two threads going on this, reply to this one.............

Sizing OCPD Pump

good morning I am looking to size a Circuit Breaker for a Pump @208V Motor, rated current is 11.9A, Starting current is 76.8 (see attachment) . Per NEC 240.6 (A), FLA *1.25 should be used. However, since there is a much gap between rated and starting current what do i use as my FLA. My concern...

forums.mikeholt.com