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ASTTBC RFPT — Fire Alarm Systems (AL) · Question

How is the wiring supervision (Class A or B) for an initiating circuit verified according to CAN/ULC-S537?

Wiring supervision must be confirmed by introducing a fault (open circuit, ground fault, or short circuit) at the most remote point of the circuit.

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Question: How is the wiring supervision (Class A or B) for an initiating circuit verified according to CAN/ULC-S537?

Answer options:

  • Testing at the control panel terminals only
  • Checking the EOL resistor value with a multimeter
  • Visual inspection of wire gauge and insulation color ✅ Introduction of a fault condition at the most remote point of the circuit

Correct answer: Introduction of a fault condition at the most remote point of the circuit

Explanation: Wiring supervision must be confirmed by introducing a fault (open circuit, ground fault, or short circuit) at the most remote point of the circuit.

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