Which Parts of Article 800 govern underground circuits outside the building?

• A. Parts II, III, and IV
• B. Parts I and II
• C. Parts II and IV
• D. Parts I, II, and III

Answer: (A)

Underground circuits outside the building require the installation rules that specifically address outdoor and buried wiring. General provisions won’t cover the particular conditions these setups face, so you look to the sections of Article 800 that deal with underground installations and exterior installations. Those parts provide the details on how buried lines, outdoor runs, and exterior equipment must be installed and protected, ensuring safety and reliability in outdoor, underground conditions. Because this scenario involves both being underground and outside the structure, you need the combined guidance from the sections that handle underground installations and exterior installations (along with any related outdoor requirements). Leaving out any of those sections would leave out important rules for one aspect of the installation. So the best choice is the set that includes the parts addressing underground and exterior installations.