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In the context of electrical installations, a down guy refers to a specific type of guy wire that is anchored at ground level. These are crucial components in the stabilization of above-ground utility poles and structures, providing additional support to maintain their vertical alignment and reduce swaying or movement caused by wind or other environmental factors.

Down guys are installed at an angle from the top of the pole to an anchor point on the ground, which helps counteract the forces that might pull the pole down or cause it to lean. This is particularly important for utility poles, which must remain upright to ensure the safety and reliability of the electrical distribution system.

The other options do not accurately describe a down guy. A type of electrical circuit does not encompass the function of structural support, while protective devices against overloads involve electrical safety mechanisms, and insulation for overhead lines relates to the material used to prevent electrical leaks and ensure safe transmission, none of which pertain to the physical stabilization roles of guy wires.