150Hp 460V 3 ph motor with Rockwell softstart

[Jraef]

I’m using the 2023 Code. Id love to be able turn this into an outright code violation.
Routing 5kV, shielded 133% into a 460V motor peckerhead has many problems - where/how do they terminate the shields?
There’s no room for that. Also the cable OD is so large it won’t even fit into the threaded hub. And lastly all resources I’ve found show no shielding is required on a soft start


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Correct, no shielding is required for soft starters. Once it is done ramping, it is bypassed and the motor is running across the line. Shielding for VFD cables is sometimes required, but never for soft starters. That demonstrates a basic lack of understanding of the technology on their part.

 

[Dale001289]

Correct, no shielding is required for soft starters. Once it is done ramping, it is bypassed and the motor is running across the line. Shielding for VFD cables is sometimes required, but never for soft starters. That demonstrates a basic lack of understanding of the technology on their part.

Definitely they are real amateurs - obviously low the bidders.


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[jim dungar]

I’m using the 2023 Code. Id love to be able turn this into an outright code violation.
Routing 5kV, shielded 133% into a 460V motor peckerhead has many problems - where/how do they terminate the shields?
There’s no room for that. Also the cable OD is so large it won’t even fit into the threaded hub. And lastly all resources I’ve found show no shielding is required on a soft start


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The installation I saw, had the MV cable terminated in a j-box with normal wiring the last couple of feet to the motor. The length of the MV cable might have been 300'.

 

[Dale001289]

The installation I saw, had the MV cable terminated in a j-box with normal wiring the last couple of feet to the motor. The length of the MV cable might have been 300'.

Good
To know


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