TABLE OF COEFFICIENTS C1

The correction coefficient C2 takes into consideration the working conditions.
It represents the coefficient greater than 1 by which the nominal power must be multiplied to take into account any load peaks which may be present upon start-up or during operation. Its selection is based on the conditions reported in the table.

 

TABLE OF COEFFICIENTS C2

Type of service

C2

Working conditions

Light service

1

Intermittent service - Operating for less than 6 hours per day.

No load peak.

Alternating current electric motors with normal torque

Normal service

1,25

Operating for 6-16 hours per day with load peaks or surge load which do not exceed 1.5 times the full load. Parallel excitation a.c. or d.c. electric motors.

Heavy service

1,5

Operating for 16-24 hours per day with load peaks upon surge load which do not exceed 2.5 times the full load.

High surge torque a.c. motors or d.c. motors with series excitation.

Extreme service

1,6 – 2

Continuous service 24/7. Load peaks upon surge load which exceed 2.5 times the full load. - Frequent start-ups

High surge torque a.c. electric motors or d.c. electric motors with series and compound excitation.



Page 3 of 12