Which items are permitted to project over the side rails of cable trays when not subject to damage?

The correct answer emphasizes that cable slices are permitted to project over the side rails of cable trays when they are not subject to damage. This is due to their design and function, which typically serve to support and manage the arrangement of cables within the tray. Cable slices, in appropriate contexts, are not likely to be impacted or damaged by external factors, allowing them to extend beyond the confines of the tray without risking integrity or safety.

In contrast, cable ties, clamps, and wraps serve different purposes. Cable ties are primarily for bundling cables together, but when extended over protrusions, they could become disconnected or damaged. Cable clamps are meant to secure cables in place but are not designed for projection and may pose a risk if they extend beyond the tray, leading to potential entanglement. Cable wraps, used for insulation or protection, similarly are not intended to extend beyond an enclosed area as they could be frayed or damaged when exposed. This contextual understanding reinforces why the projection of cable slices is permissible while ensuring operational safety and functionality within the cable tray system.