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The correct choice is based on the requirements for shunt circuits in fire alarm systems. Conductors used in these environments must meet specific guidelines to ensure safety, performance, and reliability.
Shunt circuits are typically used in alarm systems to allow for direct communication between devices. The minimum conductor size of 14 AWG is established to ensure adequate current-carrying capacity and minimize voltage drop across the circuit, which is critical for maintaining functionality during an alarm condition. Additionally, using insulated conductors helps protect against short-circuits and reduces the risk of fire hazards arising from exposed wires.
Insulation serves multiple purposes: it protects the conductors from physical damage, reduces the likelihood of accidental contact with live wires, and helps prevent electrical interference. For these reasons, using insulated 14 AWG conductors is a recognized standard in fire alarm installations and supports the functional integrity of the fire protection system.