Cable trays must include fittings for what purpose?

Cable trays are utilized in electrical installations to support insulated electrical conductors and cables. One of the key requirements for cable trays is that they must include fittings to accommodate changes in direction and elevation of runs. This is essential because, during installation, cables may need to navigate around obstacles or be installed at different heights.

Using fittings allows for a smooth transition of cables, minimizing strain and potential damage to the cables as they move through the tray. Proper fittings help maintain the integrity of the installation, ensuring that cables can be routed efficiently and safely throughout the system. This attention to directional and elevation changes is critical in maintaining compliance with electrical codes and ensuring the longevity and reliability of the cable systems in place.

Other options do address important aspects of electrical systems, such as wiring termination, electrical isolation, and grounding connections, but they do not pertain directly to the primary role of fittings in cable trays. The main focus of fittings in this context is specifically related to the physical arrangement and routing of the cables.