What materials can be used for main bonding jumpers and system bonding jumpers?

The choice indicating that main bonding jumpers and system bonding jumpers can be made of copper, aluminum, copper-clad aluminum, or a corrosion-resistant material is correct due to the electrical conductivity and durability of these materials. Copper and aluminum are widely used in electrical applications because they provide excellent conductivity, which is crucial for effective grounding and bonding.

Copper-clad aluminum combines the lightweight properties of aluminum with the conductivity of copper, making it a suitable option for installations where weight is a concern. Additionally, specifying corrosion-resistant materials ensures that the jumpers will maintain their integrity and performance even in challenging environmental conditions, which is vital for safety and effectiveness in grounding systems.

The flexibility to use multiple materials helps accommodate different installation scenarios and regulatory requirements, enhancing the overall reliability of the electrical system's grounding and bonding components.