Which materials are permitted for use as main and system bonding jumpers?

Main and system bonding jumpers are critical components in electrical systems, ensuring proper grounding to maintain safety and functionality. The correct choice of materials is essential for their effectiveness in conducting electrical currents.

The use of aluminum and copper for bonding jumpers is permitted because both materials are excellent conductors of electricity and have a proven track record in grounding applications. Copper is particularly well-respected for its high conductivity and resistance to corrosion, making it a popular choice for electrical installations. Aluminum, while slightly less conductive than copper, is lightweight and cost-effective; it can be used successfully in many bonding applications provided it is properly connected and protected against oxidation.

This combination allows for flexibility in installations, accommodating different environmental conditions and project requirements. Proper connection methods and care must be taken when using aluminum to prevent issues related to corrosion and reliability, but when done correctly, aluminum and copper both satisfy the requirements for main and system bonding jumpers.

Other materials like steel, while conductive, are not typically preferred for bonding jumpers due to susceptibility to corrosion unless adequately protected. Plastic cannot be used for bonding jumpers because it is an insulator and does not conduct electricity, thereby failing to fulfill the intended purpose of bonding and grounding.

The selection of aluminum and copper for bonding jumpers directly