You are replacing a 10 HP, 460V, 3-phase motor. The nameplate lists the Full Load Amps (FLA) as 14.0A and the Service Factor as 1.15. What is the maximum setting for the overload relays according to general NEC rules?
Answers
A19.6A (140% of FLA)
B17.5A (125% of FLA)
C14.0A (100% of FLA)
D16.1A (115% of FLA)
Correct answer: B — 17.5A (125% of FLA)
For motors with a Service Factor of 1.15 or greater, the NEC allows the overload device to be sized up to 125% of the nameplate FLA (14.0 * 1.25 = 17.5A).
MIFOTRA exam practicealigned to NFPA 70 / IEC 60364·3 marks·Medium