QuestionJune 23, 2025

-Which of the following is TRUE with regard to circuit breaker interrupting capacity ratings? Select one: a. NEMA tests are certified by unbiased reviewers. b. UL tests now include NEMA ratings. c. The interrupting capacity of a circuit breaker is the same for all voltage levels. d. UL tests are self-certification.

-Which of the following is TRUE with regard to circuit breaker interrupting capacity ratings? Select one: a. NEMA tests are certified by unbiased reviewers. b. UL tests now include NEMA ratings. c. The interrupting capacity of a circuit breaker is the same for all voltage levels. d. UL tests are self-certification.
-Which of the following is TRUE with regard to circuit breaker interrupting capacity ratings? Select one: a. NEMA tests are certified by unbiased reviewers. b. UL tests now include NEMA ratings. c. The interrupting capacity of a circuit breaker is the same for all voltage levels. d. UL tests are self-certification.

Solution
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Answer

a. NEMA tests are certified by unbiased reviewers. Explanation 1. Analyze the Options Evaluate each statement based on standard practices and definitions related to circuit breaker ratings. 2. Determine Correctness of Each Statement a. NEMA tests are certified by unbiased reviewers - This is generally true as NEMA standards involve third-party testing. b. UL tests now include NEMA ratings - UL (Underwriters Laboratories) and NEMA (National Electrical Manufacturers Association) have different standards; they do not inherently include each other's ratings. c. The interrupting capacity of a circuit breaker is the same for all voltage levels - False, as interrupting capacity varies with voltage levels. d. UL tests are self-certification - False, UL certification involves independent testing by Underwriters Laboratories.

Explanation

1. Analyze the Options<br /> Evaluate each statement based on standard practices and definitions related to circuit breaker ratings.<br /><br />2. Determine Correctness of Each Statement<br /> a. NEMA tests are certified by unbiased reviewers - This is generally true as NEMA standards involve third-party testing.<br /> b. UL tests now include NEMA ratings - UL (Underwriters Laboratories) and NEMA (National Electrical Manufacturers Association) have different standards; they do not inherently include each other's ratings.<br /> c. The interrupting capacity of a circuit breaker is the same for all voltage levels - False, as interrupting capacity varies with voltage levels.<br /> d. UL tests are self-certification - False, UL certification involves independent testing by Underwriters Laboratories.
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