I have a location that has a 5hp 230 volt single phase motor. FLC is 28 amps. Used for pumping propane. The operator tells me the pump runs for a maximum 20 to 40 minutes at a time. Presently its wired thru a size 0 motor starter [Linked Image], no 12 wire and a 20 amp 2 pole breaker. Tell me how this works(and it has for 10 years) when the motor running draws 32 amps(from my clamp on).
If continous it should have size 2 starter, # 8 wire and as high as a 70 amp breaker,. Is this intermitant duty as it migh run for 40 minutes and then not again for hours? Can I use 430.22 duty cycle service?? and am I reading 430.33 right if intermittant I can use the breaker as my overload protector?? How do I size wire and breaker? per 430.22???

Realistically if the customer approves the money I'm going to continous duty calcs but otherwise how do I go about sizing for intermittant.

I have pictures of one shoddy install I'll post later.

Thanks Jon