Electrical Inspection, Testing and Certification Practice Exam 2025 – Comprehensive All-in-One Guide for Exam Success!

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What is the primary role of protective relays in electrical systems?

To enhance overall system efficiency

To detect faults and isolate them from the system

The primary role of protective relays in electrical systems is to detect faults and isolate them from the system. These devices monitor electrical parameters such as current, voltage, and frequency. When they detect abnormal conditions that could indicate a fault, such as a short circuit or an overload, they quickly respond by operating circuit breakers or other isolation devices. This action helps protect equipment, ensures safety by preventing electrical fires or explosions, and maintains overall system reliability.

While enhancing system efficiency, increasing power transfer rates, and preventing circuit overloads are important aspects of electrical systems, they are not the primary function of protective relays. Instead, the focus of protective relays is on protective measures, ensuring that any irregularities in electricity flow are swiftly addressed to minimize damage and maintain safety.

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To increase electrical power transfer rates

To prevent overloading circuits

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