Installation of Cable in Cable Trays involves precise routing on support systems, NEC/IEC compliance, grounding, ampacity derating, bend radius control, segregation of services, fire safety, labeling, and reliable cable management for industrial and commercial. Installation of Cable in Cable Trays involves precise routing on support systems, NEC/IEC compliance, grounding, ampacity derating, bend radius control, segregation of services, fire safety, labeling, and reliable cable management for industrial and commercial. Proper installation of cables in trays is critical for maintaining an efficient and safe electrical system. The key requirements for cable tray installation include: Incorrect installation can lead to overheating, cable damage, or system failure. This is why proper planning and execution are. Need to renew your Electrician license? Pick your state and browse state-approved Electrician CE courses — complete your continuing education hours online, with instant reporting. The use of ladder-type. 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. 305(a)(3), or comparable standards promulgated by States operating OSHA-approved State plans.