Alwayslearningelec
Senior Member
- Location
- NJ
- Occupation
- Estimator
Power & In Rush
- Thread starter Alwayslearningelec
- Start date
- Status
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Look at table 430.52 based on 120 amps.
Alwayslearningelec
Senior Member
- Location
- NJ
- Occupation
- Estimator
Extremely confusing as to which on the chart I follow. The disconnect switch from the hoist company is 200A. I was hoping we could feed it from a 200A fused switch in the switchboard.
My take is this:
FLA is 120A and I will choose a 150A breaker. A 150A breaker will trip for a current of 230A(191% of FLA) in 400 seconds; trip in 100 seconds for a current of 380A(316% f FLA) and so on. So, at an inrush of 200A, the 150A circuit breaker will not trip the trip range of 400 seconds is enough for your hoist to have normalized its load current.
FLA is 120A and I will choose a 150A breaker. A 150A breaker will trip for a current of 230A(191% of FLA) in 400 seconds; trip in 100 seconds for a current of 380A(316% f FLA) and so on. So, at an inrush of 200A, the 150A circuit breaker will not trip the trip range of 400 seconds is enough for your hoist to have normalized its load current.
- Status