Must be listed as having adequate fire resistance and low-smoke producing characteristics by exhibiting a flame travel distance that does not exceed 1. 5 m (5 ft) and by generating a maximum peak optical density of 0. 15 when tested. Fire-resistant cable trays are engineered to withstand high temperatures, maintain mechanical integrity, and minimize fire spread. Failing to install them according to standards can lead to: Compromised fire resistance. Non-compliance with local building codes. A key component of these standards for industrial applications is a communication cable's tray-rating, which evaluates and certifies the. Scope: Firestopping for busway, cable trays, cables, and trunking passing through walls in enclosed electrical installations. Where cables pass through shafts, walls, slabs, or enter electrical panels or cabinets, openings shall be tightly sealed with firestopping materials in accordance with. Article 392 of the NEC provides the basic requirements for installations using cable tray. The respective article for the cable type must also be followed. This document outlines the key requirements for cable tray layout, installation, and fireproofing in industrial and commercial environments.