These shall be same as signal cables except there shall be no individual pair shielding in case of multipair cables. Maximum of 12 pairs per cable ii) Control / Alarm / Status Cables:.One pair of 22 AWG 7 strand copper wire with PVC insulation, for communication.Individual pair shielding apart from overall shielding.Pair identification by color coding/numbering.Multi pair cables shall have following additional features: These shall have PVC inner jacket, galvanized steel armoring and overall PVC outer PVC covered, 7 stranded Copper conductor, 100% aluminum Mylar shielding shall be provided with 25% overlap on either side & 18 AWG 7 strands copper drain conductor. Twisted single pair/triad cables shall be 600 V rated and shall have 1.5 sq. The properties of fire retardant cables tobe used for different applications shall in general be as follows: b) Fire Retardant Cables:Ĭables that are not Fire Resistant shall be Fire Retardant type and shall comply with the requirements of IEC 60332-3 (Category – C). These cables shall comply with the requirements of IEC 60331 and IEC 60332-3 (Category C) or better. This includes all parts of F & G Systems, ESD systems, PA Systems, warning beacons and platform status lamps, fire control systems, and power supplies to those systems. The cables used shall in general be of the following types: a) Fire Resistant Cables:Ĭables of this type shall be used for all circuits that have a safety-related function, or are required to remain operational under emergency conditions. The temperature index shall be over 250C. The inner and outer jacket of the cables shall be made of extruded flame retardant 90 C PVC to IS 5831 type ST2. Also refer relevant Electrical Specification for further details on cables.) Cable Types: (The general requirements of cables are as given below.
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