Motor OCPD Sizing

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Question 1 of 5

1. Question

What is the primary purpose of a breaker in motor overcurrent protection?

To protect against any short circuits or ground faults
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To protect against motor overheating
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To regulate the motor speed
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To increase the motor's efficiency
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Question 2 of 5

2. Question

What happens when a motor becomes overloaded?

It starts drawing significantly more current
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It uses less current
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It stops drawing current
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It automatically shuts down
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Question 3 of 5

3. Question

In motor protection, what is the significance of a locked rotor?

It leads to an excessive current draw
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It indicates the motor is running efficiently
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It causes a reduction in current draw
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It suggests the motor is in a safe operating state
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Question 4 of 5

4. Question

When sizing overloads for a general purpose motor with a 1.15 service factor and 40 degrees heat rise, what percentage of the motor’s nameplate amperage is typically used?

125%
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100%
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115%
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150%
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Question 5 of 5

5. Question

What is the primary difference between short-circuit and ground-fault protection and overload protection for motors as outlined in the NEC?

Short-circuit and ground-fault protection protects the motor from overheating, while overload protection prevents damage from high fault currents.
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Overload protection protects the motor from sustained overcurrent conditions during normal operation, while short-circuit and ground-fault protection respond to high fault currents caused by wiring faults or equipment failure.
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Short-circuit and ground-fault protection and overload protection are the same and function identically to protect the motor from all overcurrent conditions.
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Overload protection only applies to single-phase motors, while short-circuit and ground-fault protection only apply to three-phase motors.
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