When properly planned, installed, and serviced, cable trays provide safe routing of power, low voltage control, data, and telecommunications wiring. Cables in these trays are easy to mark, find, and remove. A rung spacing of 6 to 9 inches (150 to 230 mm) is preferable when the cable tray cont d for instrumentation and control applications that require. Below are the key principles to guide the layout of E&I cable trays, focusing on practical, safety, and efficiency aspects. Separation of Electrical and Instrumentation Cables Electrical on Top, Instrumentation Below: Typically, electrical trays are positioned above instrumentation trays. Some key IEC standards used in cable tray and conduit system planning include: These. Wire mesh cable tray, also called basket cable tray, is a kind of cable tray made of stainless steel wires by welding wires together, forming a basket-like mesh Cable Trays are mainly used for low voltage, telecommunication, and fiber optic cables supported on short spans. Channel cable tray. Answer: No. NEC section 300-8 does not permit any tube, pipe, or equal for water, air gas, drainage, steam, or any service other than electrical in raceways or cable trays containing. Cable trays are structural components of a facility's electrical system, and as such, are part of a planned cable management system. 305(a)(3) and within various provisions of the National Electric Code (NEC).