22 (A) (1) (a) through 392. 22 (A) (1) (c) outlines the rules for placing multiple conductor cables within a cable tray. The primary rulebook used in the safe use of cable trays is NEC Article 392. This is a description of how to select, install, and support these metal or plastic frames, on which electrical wires are installed. ANY MIXTURE. NEC Article 392 explains cable trays, their components, appropriate wiring methods for cable trays, and instances where they are and are not permitted for use. Historically, the NEC has allowed cable trays, but has lacked specific guidelines for sizing conductors and using smaller. This guide covers the critical steps, from selecting the right electrical cable tray and performing accurate cable fill calculations to managing a safe cable pull through and ensuring all bonding and grounding requirements are met. For licensed electricians, mastering these principles is essential.
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