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MOTORS FOR VERTICAL SHAFT TURBINE–TYPE PUMPS (NFPA 20 Clause 9.5.1.9)

LISTING & SELECTION:

 

9.5.1.1 All motors shall comply with NEMA MG-1, Motors and Generators, and shall be marked as complying with NEMA Design B standards for three-phase motors

 

3.3.58 Service Factor. A multiplier of an ac motor that, when applied to the rated horsepower, indicates a permissible horsepower loading that can be carried at the rated voltage, frequency, and temperature. For example, the multiplier 1.15 indicates that the motor is permitted to be overloaded to 1.15 times the rated horsepower.

 

9.5.2.2 The following shall apply to the service factor:

(1) The maximum service factor at which a motor shall be used is 1.15.

 

9.5.1.9.1 Motors for vertical shaft turbine–type pumps shall be dripproof, squirrel-cage induction type.

 

9.5.1.9.2 The motor shall be equipped with a nonreverse ratchet.