Motor multiplying factor using ANSI C37 vs IEEE Red Book
How are motor multipliers used?
ANSI C37 option uses Table 4-1 and is applicable only for momentary and interrupting SC study. It is not used in LV studies.
IEEE Red Book option uses Table 4-2 and is applicable for all voltages, including LV studies.
In the example below, when 'ANSI C37" option is selected, no factor will be used for the LV SC study.
When the "IEEE Red Book" option is selected, Table 4-2 will be used and a factor of 1.2 will be used for the motor.