What is the smallest conductor size that can be pulled into a raceway for fire alarm systems?

The appropriate answer for the smallest conductor size that can be pulled into a raceway for fire alarm systems is #14. In the context of electrical installations, particularly for low-voltage systems such as fire alarm systems, there are specific guidelines and requirements that dictate the acceptable conductor sizes for use in raceways.

For fire alarm systems, the National Electrical Code (NEC) allows for #14 AWG conductors for Class 2 circuits, which are common in fire alarms. These conductors have adequate current-carrying capacity while also being manageable for installation within raceways, ensuring that they can be pulled without excessive resistance or risk of damage.

In contrast, smaller sizes such as #16 or #18 AWG are generally not permitted for this specific application, as they may not meet the necessary requirements for current-carrying capacity or may not comply with local regulations concerning fire alarm installations. Thus, using #14 AWG ensures compliance with safety standards and functionality in fire alarm systems.