Question 253Electricity & Electronics - Assistant Engineer

The correct answer is B) check the overload relay for tripped condition, reset as necessary. The reasoning behind this is that if the motor will not start when the "off-run" switch is placed in the run position, the most likely cause is that the overload relay has tripped, which is designed to protect the motor from overloading. Checking the overload relay for a tripped condition and resetting it as necessary would be the first step in troubleshooting the issue. The other answer choices are not correct because: A) checking the main contactor coil is not the first step, C) checking the overload relay heaters is unnecessary if the relay has simply tripped, and D) checking the disconnect switch is not relevant if the switch is already in the run position.