Motor overcurrent protection includes the motor overload protection and which other type?

Motor overcurrent protection is essential for safeguarding electric motors from damage due to excessive current conditions. This protection typically consists of two main components: motor overload protection and motor short-circuit and ground-fault protection.

Motor overload protection is designed to prevent overheating of the motor windings due to prolonged overcurrent situations, while motor short-circuit and ground-fault protection is critical for addressing faults that can cause immediate and severe current surges. Short circuits typically occur when there is an unintended path for current to flow, leading to excessive current that can potentially damage the motor and electrical components. Ground faults occur when current finds an alternate path to ground, which can pose safety hazards and equipment damage risks.

Combining these two types of protection ensures comprehensive safeguarding of the motor. The other options mentioned do not pertain directly to overcurrent protection. Motor conductor size and motor starter size relate to the specifications and ratings of electrical components rather than the protective mechanisms directly associated with controlling overcurrent conditions in motors. Thus, short-circuit and ground-fault protection is the correct answer as it directly complements motor overload protection to provide full coverage against overcurrent situations.