ITC (instrumentation tray cable, NEC Article 725) is intended for low energy (not exceeding 150 volts and 5 amps) control, signal and communication circuits. Low voltage wiring refers to insulated wire with non-metallic sheathing that transmits 50 volts or less of electricity. Voltage classifications can be confusing. A cable tray is a support structure that seems to be a bridge that supports wires in the air. The significance of this difference is that it varies the type of wires that can be employed. It includes the general requirements for all wiring methods included in the NEC, but does not apply to twisted-pair cable and coaxial cable (covered in Chapters 7 and 8) unless Article. They keep cables safe and make it easy to add or change cables later. Perforated Trays: These have a flat bottom with. Whether you're planning a DIY upgrade or hiring professionals, this guide breaks down the key concepts, wiring types, installation tips, and safety codes you need to know for a successful low-voltage setup in 2025.