Final answer:
To utilize a structure or pipeline as a ground return circuit, it must be verified that it is properly grounded and made of conductive material to ensure a low-resistance path to the earth and safety.
Step-by-step explanation:
When employing a structure or pipeline as a ground return circuit, it needs to be determined that the structure or pipeline is properly grounded. Grounding means that a conductor is connected to the earth with a good conductor, creating a low-resistance path directly to the earth. This practice ensures that the potential of the grounded structure is at zero volts relative to the earth, making it safe to touch and providing a reliable path for electrical current to complete a circuit.
A structure or pipeline used as a ground return circuit must also be made of conductive material to ensure efficient current flow. While insulation is important for the safety of live or hot wires and to prevent unintended current paths that could lead to faults or injury, in the context of a ground return circuit, the focus is on proper grounding and conductivity.