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Soft Starter Upstream Pd

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#1 ipel


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Posted 07 November 2011 - 11:28 PM


I have a water well pump being fed from a soft start panel. The motor is around 57kW so I estimate around 102A/phase. But wondering what the feeder pd should be. I'm reckoning on a 160A MCCB @ any helpers please

#2 marke


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Posted 08 November 2011 - 08:27 AM

Hello ipel

Th upstream protection MCCB or fuses must be sized to protect the cable used, so determine the cable size and then select the protective device to protect that cable.
The motor starter must include protection to protect the motor. This is a separate issue.

Best regards,

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