Question 6Electricity & Electronics - 1st Asst/Chief

The correct answer is D) Secure and tag the supply circuit breaker in the open position. This is the correct answer because it is the most comprehensive and safest approach to de-energizing electrical or electronic equipment before performing any work. Securing and tagging the supply circuit breaker in the open position ensures that the circuit is completely isolated from the power source, preventing accidental energization during the work. This aligns with standard safety protocols for working on live electrical systems. The other options, while potentially useful, are not as comprehensive. Option A) de-energizing the applicable switchboard bus may not completely isolate the circuit, and Option B) stationing a man at the circuit supply switch does not physically secure the circuit. Option C) bypassing interlocks could create additional safety hazards.