Is it permitted to supply a building by passing the service supply through the interior of another building?

• A. Yes
• B. No
• C. Only with a permit
• D. Only if the second building is under two stories

Answer: (B)

The service conductors must terminate in the building they are supplying, and their path cannot run through the interior of another building. This keeps the service equipment and disconnects accessible for quick de-energization and makes fire and safety protections clear and local to the building being served.

So supplying one building by routing the service through the inside of a separate building isn’t allowed. If two buildings need power, you’d provide separate service equipment for each building or run appropriate feeders between buildings with proper protection and disconnects, but you don’t route the service conductors through another structure’s interior. Allowing a permit or a specific height for the other building doesn’t override this safety requirement.