Which type of ground clamp is designed for installation on permanently grounded conductors or metal structures?

The type of ground clamp designed specifically for installation on permanently grounded conductors or metal structures is known as Type 3. This clamp is engineered to provide a secure and reliable connection to grounded systems, ensuring effective grounding for electrical installations. Type 3 clamps are commonly used in situations where there is a need for durability and long-term attachment to grounding elements, such as pipelines or structural steel.

On the other hand, the other types mentioned, like the C type, ball and socket, and clamp type, serve different purposes or applications that may not involve permanent grounding. For example, C type clamps are often used for temporary connections, and ball and socket designs are typically associated with movable joints rather than fixed ground connections. Thus, Type 3 stands out as the correct choice for installations requiring a robust and lasting connection to permanently grounded elements.