How shall expansion fittings and telescoping sections of metal raceways be made electrically continuous?

Expanding fittings and telescoping sections of metal raceways must maintain electrical continuity to ensure a proper return path for electrical currents, as well as to enhance safety by preventing potential shock hazards. The use of equipment bonding jumpers is the most reliable method for achieving this continuity.

Equipment bonding jumpers are specifically designed to connect conductive parts that need to be grounded or bonded together. They provide a low-resistance path back to the ground, which is essential for the operation of overcurrent protection devices, in case of a fault. This method is recommended as it complies with the National Electrical Code (NEC) requirements, ensuring safety and effective bonding between components in a raceway system.

Wire nuts, soldered connections, and crimping may not provide the appropriate level of reliability and compliance required for ensuring that expansion fittings and telescoping sections maintain their electrical conductivity under all conditions. Wire nuts are typically used for connecting insulated wires, soldered connections can introduce weak points due to potential heat exposure, and crimping may not always produce a sufficient contact pressure needed for long-term reliability in metal raceways. Therefore, utilizing equipment bonding jumpers is the most effective and code-compliant approach for maintaining electrical continuity in these systems.