New York State Master Electrician Practice Exam

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What is the maximum rating for over-current protection in panel boards with snap switches?

100A
200A
250A
300A

The correct answer is: 200A

The maximum rating for over-current protection in panel boards with snap switches is 200A. This limit is established primarily for safety and equipment protection purposes. Snap switches, which include various types of circuit breakers and fuses designed for quick disconnection and overcurrent protection, have specific rating limits to ensure they operate effectively under maximum load conditions without risk of overheating or failure. If the current exceeds the rated value, the snap switch is designed to trip and cut off power to prevent potential hazards like electrical fires or damage to the electrical system. While higher ratings might exist in different configurations or specialized installations, panel boards incorporating snap switches are generally restricted to a maximum of 200A for efficient operation and safety compliance. Therefore, this rating is critical for electricians to understand as they design, install, and maintain electrical systems in buildings, ensuring they are within code and operational standards.