What device is required to ensure electrical continuity of loosely jointed metal raceways with expansion joints?

The requirement for ensuring electrical continuity of loosely jointed metal raceways with expansion joints specifically calls for a device that can maintain a continuous electrical path regardless of the physical separation caused by thermal expansion or movement of the raceways. An equipment bonding jumper is designed to ensure that all conductive parts are efficiently bonded to a common ground, which helps in maintaining that electrical continuity.

In the context of expansion joints, where metal raceways might separate slightly due to heat or mechanical stress, the equipment bonding jumper plays a crucial role in linking the sections of raceways together. It ensures that even in case of movement, the path for electrical current remains intact, thus preventing potential issues such as electrical shock or equipment failure.

Other options may serve different purposes: a field-installed bonding jumper is typically used to bond equipment, but doesn't specifically address the challenge posed by expansion joints in raceways. Electrical connectors may serve to join wires or components but do not provide the necessary continuous connection across expansion joints. Flexible couplings are mechanical components designed to accommodate movement, but they do not provide the necessary electrical continuity. Thus, the equipment bonding jumper is the most appropriate answer for ensuring electrical continuity in this context.