When documenting notification appliance circuits, what electrical measurement is mandatory?

Question: When documenting notification appliance circuits, what electrical measurement is mandatory?

Answer options:

• Frequency of the circuit. ✅ Measured voltage at the end-of-line device under full load.
• The color of the insulation.
• The thickness of the conduit.

Correct answer: Measured voltage at the end-of-line device under full load.

Explanation: One of the most common causes of system failure is voltage drop. The verifier must document the voltage at the 'end-of-line' device under load.