What is an alternative construction for a main bonding jumper or system bonding jumper?

An alternative construction for a main bonding jumper or system bonding jumper is indeed a wire or bus conductor. These types of conductors are essential in ensuring that electrical systems are effectively grounded and that potential differences between various system components are minimized.

Using a wire or bus conductor is advantageous as they provide excellent conductivity and mechanical strength, allowing for reliable and effective bonding between different elements of an electrical system. They are specifically designed to handle the electrical current that may flow in the event of a fault, ensuring safety and operational integrity.

In contrast, plastic tubing does not provide electrical conductivity, making it unsuitable for use in bonding applications. Flat metal plates, while conductive, typically do not offer the flexibility and ease of installation that a wire or bus conductor does. A combination of copper and steel could potentially work in some applications, but it introduces complexity in terms of corrosion and conductivity differences, which may not meet the necessary safety and functionality standards for bonding jumpers in specific electrical installations.