4 questions · 8% of the Calculations exam
Why C is correct
Motor overload protection uses nameplate current for this calculation. Multiplying 32 amperes by the supplied 1.15 factor gives 36.8 amperes; this is distinct from branch-circuit conductor sizing.
Why D is correct
Motor branch-circuit conductors are generally sized at not less than 125 percent of the applicable table full-load current. Twenty-eight amperes times 1.25 equals 35 amperes.
Why C is correct
Reverse the conductor factor: 52.5 ÷ 1.25 = 42 amperes of table full-load current. Keep units consistent and use only the factors stated; no optional method or unstated demand factor is assumed.
Why D is correct
Divide the setting by the supplied factor: 31.05 ÷ 1.15 = 27 amperes nameplate current. Keep units consistent and use only the factors stated; no optional method or unstated demand factor is assumed.
Practice all 4 Motors & Generators questions
Plus timed mock exams and a wrong book that follows you between the web and the app.
Start studying free