In the majority of cases, covers are not used on cable trays for technical or safety reasons, but due to the "raceway complex," a feeling by specifiers that cables must be totally enclosed in metal. Cable tray covers can provide additional protection to cables, shielding them from dust, moisture, and other environmental factors. For. If you literally mean a plenum, you cannot install cable tray within it. It is not a wiring method permitted in 300. If you mean "Other Space Used for Environmental Air", such as above a suspended ceiling used for return air of an HVAC system, you can install solid bottom metal tray with. Shipments shall be hand unloaded unless provisions have been made with the cable tray manufacturer for forklift unloading. en completely installed, without damage either to conductors or structural system use maintain spacing or to keep cables in place when the tray is ect the minimum bend ra-dius for cables as they exit the bottom of the cable tray. A rung spacing of 6 to 9 inches (150 to 230 mm) is preferable when.
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