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ASTTBC RFPT — Fire Alarm Systems (AL) · Question

To maintain the integrity of a Class A (DCLC) circuit, what is the requirement for the 'feed' and 'return' conductors in a vertical riser?

S524 Cl 4.1.2.2 states that the return side of the Class A loop must not be in the same conduit/raceway as the feed side, as a single impact could sever both, d

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Question: To maintain the integrity of a Class A (DCLC) circuit, what is the requirement for the 'feed' and 'return' conductors in a vertical riser?

Answer options: ✅ They cannot be in the same raceway/conduit.

  • They must be twisted together.
  • They must be shielded.
  • They must be at least 14 AWG.

Correct answer: They cannot be in the same raceway/conduit.

Explanation: S524 Cl 4.1.2.2 states that the return side of the Class A loop must not be in the same conduit/raceway as the feed side, as a single impact could sever both, defeating the redundancy.

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