What is installed at an expansion joint to provide a continuous ground between two sections of cable tray?

The installation of bonding jumpers at an expansion joint serves to ensure a continuous ground between two sections of cable tray. An expansion joint allows for thermal expansion and contraction of the cable tray system, which could potentially create a gap that disrupts the grounding path. By using bonding jumpers, you effectively bridge that gap, maintaining electrical continuity and ensuring safety. This is critical for preventing potential differences that could lead to electrical shock hazards or equipment malfunctions.

Grounding screws are typically used for connecting grounding conductors to the tray, but they alone do not accommodate the movement and expansion characteristics of the joint like bonding jumpers do. Flexible connectors might provide some accommodation for movement but are not primarily intended for grounding purposes. Ground rods are used for grounding systems in a different context and are not applicable to creating continuity within cable tray sections.