HOLT Electricians Practice Exam

If a motor's branch circuit protection exceeds the maximum allowed, what should be verified first?

1. The size of the wires

2. The motor’s nameplate rating

3. The voltage supply

4. The circuit breaker type

The correct answer is: The motor’s nameplate rating

In the context of verifying a motor's branch circuit protection that exceeds the maximum allowed, the first step should be to check the motor’s nameplate rating. The nameplate provides essential information, including the motor's full load current, horsepower, and the maximum circuit protection rating specified by the manufacturer. This is crucial as it sets the baseline parameters for what the motor can handle safely without risk of damage or failure. Understanding the motor's nameplate rating helps ensure that the branch circuit protective devices, like fuses or circuit breakers, are correctly sized to match the motor's requirements. If the protection exceeds what the motor is rated for, it could lead to insufficient protection, possibly resulting in overheating or permanent damage during overload conditions. Therefore, confirming the nameplate specifications helps guide any necessary adjustments to the branch circuit protection and ensures compliance with electrical codes. By beginning with the nameplate rating, you can ascertain whether the existing protection levels are appropriate and take the necessary actions based on that primary reference.