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CFAA Fire Alarm Technician · Question

Where should the shield of a fire alarm circuit be grounded?

S524 4.2.1.3 explicitly states that for shield continuity, the shield (drain wire) should be grounded at the control unit only to prevent ground loops.

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Question: Where should the shield of a fire alarm circuit be grounded?

Answer options: ✅ At the control unit only

  • At each device box
  • At both ends of the run
  • At the end-of-line resistor only

Correct answer: At the control unit only

Explanation: S524 4.2.1.3 explicitly states that for shield continuity, the shield (drain wire) should be grounded at the control unit only to prevent ground loops.

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