What is the minimum wire size to be installed adjacent to nonmetallic pipe used for underground gas?

The minimum wire size that should be installed adjacent to nonmetallic pipe used for underground gas is AWG 14. This requirement is based on safety and regulatory grounds to ensure adequate grounding and bonding in the vicinity of gas piping. The use of AWG 14 allows for enough current-carrying capacity while minimizing the risk of overheating and ensuring proper protection in the event of an electrical fault.

Using a wire size that is larger than necessary could create unnecessary material costs and installation complexities, while a smaller wire size would risk not providing ample protection, which could lead to increased hazards when dealing with combustible gas lines. Thus, AWG 14 strikes the right balance for safe installation practices in this context.