__________ or ___________ shall not be used below ground for water lines under a house or building

__________ or ___________ shall not be used below ground for water lines under a house or building

• A. Copper, Steel
• B. PVC, Polyethylene
• C. PEX, ABS
• D. Copper, PEX

Answer: (B)

The main idea is knowing which piping materials are appropriate for buried water service lines under a building. When a line goes below grade, it must be a material and installation method specifically rated for burial, able to handle soil pressure, movement, and long-term durability. In this context, the two materials identified as not to be used below ground for water lines under a house or building are PVC and polyethylene. These plastics, while common in other buried applications, are restricted in this particular scenario because they can be more vulnerable to soil pressures, potential deformation, or joint issues under structural conditions unless they are specifically rated for direct burial with the proper fittings and protections. Other materials like copper, steel, PEX, or ABS are generally accepted for buried water lines when installed with the appropriate burial-rated fittings and practices, which is why they aren’t the pair indicated as unsuitable here.

The main idea is knowing which piping materials are appropriate for buried water service lines under a building. When a line goes below grade, it must be a material and installation method specifically rated for burial, able to handle soil pressure, movement, and long-term durability. In this context, the two materials identified as not to be used below ground for water lines under a house or building are PVC and polyethylene. These plastics, while common in other buried applications, are restricted in this particular scenario because they can be more vulnerable to soil pressures, potential deformation, or joint issues under structural conditions unless they are specifically rated for direct burial with the proper fittings and protections. Other materials like copper, steel, PEX, or ABS are generally accepted for buried water lines when installed with the appropriate burial-rated fittings and practices, which is why they aren’t the pair indicated as unsuitable here.