Final answer:
Copper pipe is not suitable for installation in potable water-supply systems due to the potential release of copper ions into the water.
Step-by-step explanation:
Copper pipe is not suitable for installation in potable water-supply systems. Copper is commonly used for plumbing systems, but it can release small amounts of copper ions into the water, which can be harmful if consumed over a long period of time. Therefore, it is recommended to use other materials like PVC or PEX for potable water-supply systems.