MI, mineral insulated cable, with termination fittings approved for the location, has been permitted in Class I, Division 1 and Class II, Division 1 locations since the 1962 NEC. This cable can be installed in cable trays in Division 1 locations and can also provide fire. Cable Trays have been permitted in the hazardous (classified) locations in the National Electrical Code for Class I (flammable vapor and gases) since the 1978 NEC and have been used extensively in chemical plants, refineries, and other types of facilities. This article is about code requirements. Cable tray is one of the most common methods of supporting wire and cable. Tray can be manufactured in various types of material including aluminum, steel and fiber and other nonmetallic materials. Separation: High-power and low-power cables must be separated to prevent electromagnetic interference (EMI). Materials: Choose the tray material - aluminum, steel, or FRP -. Type NM, type NMC, and type NMS cables may be used in the following, except as prohibited in section 334. 12: (1) One- and 2-family dwellings and their attached or detached garages, and their storage buildings. (3) In other structures exceeding 1 floor above grade, cables. (1) Only the following may be installed in cable tray systems: (a) Mineral-insulated metal-sheathed cable (Type MI); (b) Armored cable (Type AC); (c) Metal-clad cable (Type MC); (d) Power-limited tray cable (Type PLTC); (e) Nonmetallic-sheathed cable (Type NM or NMC); (f) Shielded. California Code of Regulations, Title 8, Section 2418. These regulations are for the convenience of the user and no representation or warranty is made that the information.