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(A) Complete System
Cable trays shall be installed as a complete system. Field bends or modifications shall be so made that the electrical continuity of the cable tray system and support for the cables is maintained. Cable tray systems shall be permitted to have mechanically discontinuous segments between cable tray runs or between cable tray runs and equipment.
(B) Completed Before Installation
Each run of cable tray shall be completed before the installation of cables.
(C) Covers
In portions of runs where additional protection is required, covers or enclosures providing the required protection shall be of a material that is compatible with the cable tray.
(D) Through Partitions and Walls
Cable trays shall be permitted to extend transversely through partitions and walls or vertically through platforms and floors in wet or dry locations where the installations, complete with installed cables, are made in accordance with the requirements of 300.21.
(E) Exposed and Accessible
Cable trays shall be exposed and accessible, except as permitted by 392.18(D).
(F) Adequate Access
Sufficient space shall be provided and maintained about cable trays to permit adequate access for installing and maintaining the cables.
(G) Raceways, Cables, Boxes, and Conduit Bodies Supported From Cable Tray Systems
In industrial facilities where conditions of maintenance and supervision ensure that only qualified persons service the installation and where the cable tray systems are designed and installed to support the load, such systems shall be permitted to support raceways and cables, and boxes and conduit bodies covered in 314.1. For raceways terminating at the tray, a listed cable tray clamp or adapter shall be used to securely fasten the raceway to the cable tray system. Additional supporting and securing of the raceway shall be in accordance with the requirements of the appropriate raceway article. For raceways or cables running parallel to and attached to the bottom or side of a cable tray system, fastening and supporting shall be in accordance with the requirements of the appropriate raceway or cable article.
For boxes and conduit bodies attached to the bottom or side of a cable tray system, fastening and supporting shall be in accordance with the requirements of 314.23.
(H) Marking
Cable trays containing conductors operating over 600 volts shall have a permanent, legible warning notice carrying the wording "DANGER — HIGH VOLTAGE — KEEP AWAY" placed in a readily visible position on all cable trays, with the spacing of warning notices not to exceed 3 m (10 ft). The danger marking(s) or labels shall comply with 110.21(B).
Exception: Where not accessible (as applied to equipment), in industrial establishments where the conditions of maintenance and supervision ensure that only qualified persons service the installation, cable tray system warning notices shall be located where necessary for the installation to ensure safe maintenance and operation.

Related Code Sections

392.18 Wiring Methods and Materials, Cable Tray Installation
Cable trays shall be installed as a complete system. Field bends or modifications shall be so made that the electrical continuity of the cable tray ...
392.18 Wiring Methods and Materials, Cable Tray Installation
Cable trays shall be installed as a complete system. Field bends or modifications shall be so made that the electrical continuity of the cable tray ...
(H) Wiring Methods and Materials, Marking
the conditions of maintenance and supervision ensure that only qualified persons service the installation, cable tray system warning notices shall be located ...
(F) Wiring Methods and Materials, Adequate Access
Sufficient space shall be provided and maintained about cable trays to permit adequate access for installing and maintaining the cables ...
(F) Wiring Methods and Materials, Adequate Access
Sufficient space shall be provided and maintained about cable trays to permit adequate access for installing and maintaining the cables ...