What must be bonded to plastic piping when transitioning to another type before entering a building?

The correct answer involves bonding considerations for plastic piping that transitions to another type before entering a building. In plumbing and electrical installations, it's essential to ensure that different types of materials are properly linked together to maintain safety and prevent issues such as static electricity or electrical shocks.

Tracer wire is used in conjunction with non-metallic piping systems to provide a means of locating the pipe underground. This is especially important because plastic piping does not conduct electricity, making it difficult to trace its route after installation. By bonding the tracer wire to the plastic piping, you ensure that there is a means for determining the location of the pipe, as well as potentially grounding it to protect against the buildup of static electricity.

In contrast, other options like the ground wire or the bonding strap might not serve the same purpose in this context, especially regarding the identification of non-condictive materials, while a metal fitting could lead to complications without grounding measures in place or would not necessarily provide traceability for the plastic pipe below ground. Thus, the proper connection of tracer wire both satisfies regulatory requirements and enhances the operational safety of the plumbing system.