Code Question of the Month – March 2022

Code Question

If a transformer primary overcurrent protection device is sized at 250 percent of the primary current, what size secondary overcurrent protection device is required if the secondary current is 42 amperes?

Select one:

a. 40 amperes

b. 70 amperes

c. 60 amperes

d. 90 amperes

Answer: c. 60 amperes 42 X 1.25 = 52.5