What is the maximum length allowed for an equipment bonding jumper installed outside of flexible metal conduit?

The maximum length allowed for an equipment bonding jumper installed outside of flexible metal conduit is indeed 6 feet. This guideline is crucial for ensuring proper grounding and bonding practices, which are essential for electrical safety.

When bonding jumpers are used, they help ensure that conductive parts are at the same electrical potential, minimizing the risk of electrical shock or fire. The 6-foot rule is based on the need to maintain a reliable and effective electrical connection while allowing for some flexibility in the installation, without compromising the effectiveness of the bond.

This standard is also tied to the practicalities of installation, where exceeding the maximum length could introduce resistance or impedance in the bonding path, adversely affecting the system's performance. Therefore, adhering to this 6-foot guideline supports both safety and code compliance in electrical installations.