Wall brackets for cable trays provide a strong, durable, and reliable solution for secure wall mounting of cable trays in demanding electrical installations. They ensure optimal stability, quick installation, and long-term performance for power, data, and control cables. When offloading tray from a flat deck trailer using an overhead crane, care should be exercised in the placement and length of the slings to prevent crushing the product (siderails). es in the industrial environment. It's a. FIRSTO firestops are designed to seal multi-cable and cable tray penetrations of fire-rated walls and floors.