Underground piping buried outside of buildings shall be protected by a(n) __________.

• A. conduit
• B. enclosure
• C. cover
• D. any of the above

Answer: (D)

Protecting underground piping outside buildings is essential to prevent damage from digging, impact, soil movement, and other hazards that could compromise gas delivery. The code allows several valid protective methods, so the pipe can be run through a conduit, placed in a protective enclosure, or buried with a concrete or other protective cover. Any of these approaches provides the needed protection, and the choice depends on site conditions and risk, not a single required method.