Overcurrent device for skid

[Isaiah]

We have an air compressor with 150HP motor, cooling fans and a control panel. The vendor supplied starter is a Delta Wye which reduces the motor inrush by approx 1/3 amps. The FLA is shown as 222A
All loads are considered continuous. I was thinking the fuse sizing should be based on 1.25% times the FLA. But does the ‘soft start’ starter affect this calculation in any way?


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[ptonsparky]

We have an air compressor with 150HP motor, cooling fans and a control panel. The vendor supplied starter is a Delta Wye which reduces the motor inrush by approx 1/3 amps. The FLA is shown as 222A
All loads are considered continuous. I was thinking the fuse sizing should be based on 1.25% times the FLA. But does the ‘soft start’ starter affect this calculation in any way?


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The Fusing most likely is not used for over current protection so could be considerably higher.

 

[Isaiah]

The Fusing most likely is not used for over current protection so could be considerably higher.

Table 430.52(C)(1) shows dual element fusing at 175%, which will make the fuse amps higher


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[Johnhall30]

You can size the fuse up to 175% of the full load amps of the motor. And you can use the next size up rule if it does not correspond to a standard size.