This animated video demonstrates how cable tray systems are installed in industrial and commercial projects. Animation. association representing the major electrical equipment manufac-turers in the U. Whether you're building a commercial setup or upgrading an industrial plant, proper cable tray installation ensures neat wiring, safe access, and easy maintenance. In accordance with National Electrical Code (NEC) Article 392 “Cable trays” first determine the Maximum Fuse Ampere Rating or Circuit Breaker Ampere Trip Setting or Circuit Breaker Protective Relay Ampere Trip Setting for Ground-Fault Protection s the minimum. Cable tray systems are designed for easy installation and to accommodate power, communications, and signal cabling across a variety of applications.