Which insulators are used with larger conductors and why?

The correct answer is based on the specific requirements for supporting larger conductors in overhead power transmission systems. Post insulators are designed with a wider and more significant contact area, which allows them to effectively accommodate the weight and mechanical stress of larger conductors. This increased contact area is critical because it helps distribute the load evenly, reducing the risk of electrical breakdown or insulator failure under stress.

When it comes to supporting larger conductors, considerations such as weight distribution and mechanical strength become paramount. Larger conductors generate more significant forces due to their weight and the environmental conditions they experience, such as wind or ice. Post insulators provide the necessary structural integrity, offering more contact area to support these demands safely.

The other types of insulators serve different purposes. For example, pin insulators are more suitable for lighter conductors due to their design and limited support capacity. Suspension insulators are typically used in configurations that allow for flexibility and movement, such as in long spans, while strain insulators are specifically designed to withstand tensile forces but may not provide the same level of support over larger surface areas like post insulators will.