Underground power-limited copper fire alarm circuits that extend outside the building must comply with ?

• A. Parts II, III, and IV of Article 800 and Part I of Article 300
• B. Parts I and II of Article 800
• C. Parts III and IV of Article 600
• D. Article 725 only

Answer: (A)

Underground, power-limited copper fire alarm circuits that extend outside the building must follow both the fire alarm circuit requirements and the general outdoor wiring rules. The fire alarm article provides Parts that cover how the circuits themselves should be designed, protected, and tested, including the specifics of fire alarm wiring, how it’s routed, and how the system is inspected and verified. When the run goes underground and leaves the building, the conductors also fall under general wiring methods for outdoor installation, which are found in the general wiring article. Those general rules cover burial, conduit use, moisture protection, mechanical protection, and related installation methods for conductors that extend outside a structure. So the correct approach is to apply the fire alarm provisions for the circuits (Parts II, III, and IV) together with the general wiring rules for outdoor/underground installations (Part I of the general wiring article). The other options omit essential portions of these requirements and wouldn’t ensure full compliance.