Use NEC 392 for tray rules, but still size conductors from NEC 310. 16, tray fill, ampacity adjustment, voltage-drop checks, grounding, and IEC design cross-checks. Tray fill, spacing, ambient temperature, and sun exposure. The primary rulebook used in the safe use of cable trays is NEC Article 392. For the installation of single conductor cables sized 1/0 AWG to 4/0 AWG in industrial establishments, the NEC specifies the maximum allowable rung spacing for the cable. In the National Electrical Code (NEC), there are three main tables that we will use to size these grounding and bonding conductors. 66 (Grounding Electrode Conductor for Alternating Current Systems). 122, but understanding how to apply these requirements correctly can make the difference between a safe installation and a costly code violation.
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