I found in most of submersible pumps cables comes with less than standard cable sizes (curent capacity). These should be special cables.

How can contactors be selected to provide type 2 coordination for the motor ?

The contactors when selected to provide type 2 coordination motor, will not protect the motor cable.

e.g

62 kW motor comes with 16mm cable.
Type 2 contactor is 150 Amp.

the cables CC is near 80 A.

can someone explain why the submersible pump cables are sized small.

canyon

 

Responding to Canyon’s 28-Jul (09:31) query:

A) Typically, the cable has to fit in the annulus formed by the well casing wall and the outside diameter of the pump’s discharge piping. Thus, it is formed of three parallel conductors laid flat, i.e., side-by-side, instead of the conventional tri-foil arrangement, i.e., having an equi-spacing arrangement.

B) Cable Ampacity is about equal to that of conventional wire sizes, at least in the USA. And, if it’s an oil-well application, then the cable insulation is well suited for extreme pressure and temperature conditions.

C) Protection is based on the motor’s rating, not that of the starter size.

Let me know if the above has helped you?

Regards,
Phil Corso ([email protected])

 

As par as I know, contactors don't protect anything. You use fusing or circuit breakers to protect wiring. There may well be a special case for wiring in a cooling medium.

Regards
cww