Which of the following is a requirement for water service pipe used in construction?

The requirement for water service pipe used in construction to have a working pressure rating below 160 PSI ensures that the water service system can handle the necessary pressures without risking failure. Water systems are often subject to varying pressures due to factors like municipal supply conditions, which can fluctuate. A rated working pressure of 160 PSI or higher is common in plumbing systems to provide adequate safety margins and durability against potential pressure surges caused by water hammer or other hydraulic events.

In terms of code compliance, using pipes with sufficient pressure ratings is critical for preventing leaks and ensuring the longevity of the plumbing infrastructure. This standard helps maintain the integrity of the water service piping, which is especially important in systems that experience significant pressure differentials.

The other choices do not align with the broad requirements set by plumbing codes. Insulation is not universally mandatory for all water service pipes, the use of lead in joints has been restricted due to health concerns, and most water service pipes are required to be buried underground rather than installed above ground to protect them from environmental factors and physical damage.