What must be used to ensure metal raceways with expansion joints are electrically continuous?

To ensure metal raceways with expansion joints are electrically continuous, the use of an equipment bonding jumper is essential. This component provides a reliable path for electrical continuity across the joint where two sections of the raceway meet, especially where movement or thermal expansion may otherwise disrupt electrical connections.

Metal raceways are used to protect and route electrical conductors, and when they have expansion joints, there is the possibility of movement that can affect the electrical bonding of the circuits contained within them. By utilizing an equipment bonding jumper, any potential differences in voltage between separate sections of the raceway can be equalized, ensuring safety and compliance with electrical codes while preventing dangerous electrical conditions such as shock or arcing.

While grounding wire does play a vital role in safety by directing fault current to ground, it doesn't specifically address the need for continuity through expansion joints in raceways. Insulated connection devices and compression fittings may also serve important functions but do not ensure the necessary electrical continuity across expansion joints in the same way that an equipment bonding jumper does.