Soft start in group installation

Hello,

I am wondering if solid state soft starts are commonly used in group installations as permitted by NEC article 430.53 ©. What makes me wonder is the wording used in some of the requirements such as "each device (overload or controller) is listed for group installation with maximum rating of fuse, circuit breaker, or both". I have only seen the "listed for group installation" description for the manual motor protectors or the motor starter protectors in various manufacturers' catalogs or websites. Does it mean that you would always have to use these MMPs or MSPs along with solid state soft starts in order to use them in a group installation, even if the soft starts may have internal overload?

Any advice would be appreciated.


Thank you.
FLOW_EE

Inside delta connection on soft start

Hello,

I have used the inside delta wiring with a certain electronic soft start for a motor (50hp) that is directly coupled to a hydraulic pump recently. This choice was prompted by obvious space saving and cost saving. I am starting to wonder now that the inside delta wiring may have been a wrong choice for the application. The hydraulic system that the motor is driving does not require very high starting torque, I was told, yet the soft start keeps faulting on startup, especially when the hydraulic fluid is cold. Our hydraulic guys told me that the system has variable starting load, sometimes higher than other, but on cold startup it is likely to have more starting load than normal.

Is the inside delta connection with a soft start only for very light or virtually no starting load? I would appreciate any advice.


Thank you.
FLOW_EE