Grounding jumpers need to be no larger than which gauge copper?

Grounding jumpers are critical components in electrical systems, ensuring a low-resistance path to ground. By maintaining proper grounding, they help to protect both people and equipment from electrical faults. The requirement for the size of grounding jumpers is influenced by factors such as the electrical system's configuration, potential fault currents, and safety considerations.

Copper grounding jumpers are specified to be no larger than 4 AWG in most applications according to the National Electrical Code (NEC). This size allows grounding jumpers to provide sufficient conductivity while also being manageable for installation and connection purposes. If the size exceeds this specification, it may lead to unnecessary complexity and cost without providing additional benefits in grounding effectiveness for typical installations.

This understanding of proper jumper sizing is essential for ensuring adequate grounding, which plays a vital role in the safety and reliability of electrical systems.