What is the function of a light-duty strain carrier (rocker-arm type)?

The function of a light-duty strain carrier, specifically a rocker-arm type, is primarily to relieve the insulator string of conductor pull. This type of carrier allows conductors to be suspended in a way that minimizes stress on the insulators. By effectively managing the tension in the electrical conductors, the strain carrier helps prevent potential damage to the insulator strings and contributes to the overall stability and reliability of electrical transmission systems.

This function is crucial because insulators are designed to withstand specific loads, and any excess pull can lead to failure or decreased performance. The rocker-arm design helps distribute forces and allows for some movement, which can further ease strain on both the insulators and the attached conductors.

Other options, such as supporting heavy loads, insulating conductors, or measuring electrical current, do not accurately describe the primary role of a light-duty strain carrier. While it is true that some components in a transmission system may serve to support loads or provide insulation, those functions are not the focus of a light-duty strain carrier.