CSLB Class B General Contractor's License Practice Exam

What AWG size wire is required for the installation of plastic gas piping?

1. No. 16

2. No. 18

3. No. 20

4. No. 22

The correct answer is: No. 18

The appropriate American Wire Gauge (AWG) size for the installation of plastic gas piping is determined by the specific requirements pertaining to the use of tracer wire, which is often required to mark the location of underground plastic piping systems for safety and maintenance purposes. In most instances, No. 18 AWG wire is commonly utilized because it effectively balances sufficient strength and conductivity for the application while also being flexible enough for installations. This wire gauge size is appropriate for providing a reliable electrical connection in gas piping systems, ensuring that signals can be traced effectively if maintenance is required. Choosing No. 16, No. 20, or No. 22 wires may not meet the current code requirements for gas piping identification and could result in inadequate tracing, making it difficult for technicians to locate buried plastic pipes efficiently. Hence, No. 18 AWG is specifically recommended due to its widespread acceptance in adhering to the standards necessary for such installations.