IMSA Bench Tech II Practice Questions - IMSA Traffic Signal Bench Technician Level II Certification Exam

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What component in a NEMA cabinet provides the AC-line isolation point and is required to remove all 120 VAC field output power for safe bench work on the back panel?

The CMU/MMU reset button The police panel auto/flash switch The signal bus main circuit breaker (or main disconnect) The detector rack power switch

Correct Answer:

The signal bus main circuit breaker (or main disconnect)

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