Final answer:
Electrical systems on rural properties with plastic well supply piping can be grounded using ground rods or metal well casing.
Step-by-step explanation:
On rural properties where the well supply piping into the house is plastic, electrical systems can be grounded using both ground rods and metal well casing. Ground rods are long metal rods that are installed in the ground and connected to the electrical system to provide a path for electrical currents to flow into the ground. Metal well casing, if present, can also be used as a grounding method since it is made of metal and can conduct electricity to the ground.