Which statement is true about alarm wiring in conduits?

• A. Alarm wiring may share conduit with power circuits.
• B. Alarm wiring must be run in separate conduit from all circuits.
• C. Alarm wiring shall not be run in the same conduit with class 1, power, or lighting circuits.
• D. Alarm wiring must be placed in conduit separate from data lines.

Answer: (C)

The principle being tested is keeping low‑voltage alarm wiring separate from higher‑voltage circuits inside conduits to ensure reliability and safety. Alarm signals are delicate and can be disrupted by the electromagnetic fields, voltage spikes, or physical interference from Class 1, power, or lighting circuits. When alarm wiring shares a conduit with those higher‑voltage circuits, the risk of false alarms, missed alarms, or degraded performance increases, and it can also raise safety concerns. Therefore, the recommended practice is that alarm wiring should not run in the same conduit as Class 1, power, or lighting circuits, preserving a clean, isolated path for the signaling. Choices suggesting sharing with power or data lines are not aligned with this standard, making the stated option the correct one.