enclosures, cable tray, cable racking, special support systems, cleared or clipped fixing direct to building fabric, or aerial catenary suspension systems, as required. Cable support systems shall allow for spacing in accordance with BS 7671 for the design current of the cable. Cable trays, ladders and baskets shall conform to BS EN 61537 and BS 6946 and shall be constructed of hot rolled steel galvanized after manufacture to BS EN ISO 1461; or bending and profiling quality hot dipped galvanized steel to BS EN 10327 or BS EN 10143. All continuous runs of cable support systems shall be electrically continuous. 1.1.1.29 Cable Conduit and Trunking Conduit systems and fittings used for the installation of electrical services shall comply with BS EN 61386 and BS EN 856 as appropriate. Conduit shall be from one manufacturer throughout, with fittings to match conduit grade and finish. Temperature classification of conduits shall be -5+60°C. Resistance against ingress of water and solid foreign bodies shall be rated to BS EN 60529 with a minimum classification of minimum IP 31 for indoor use, to minimum IP 65 for exterior. Standard trunking systems and fittings used for the installation of electrical services shall comply with BS EN 856 and BS EN 50085. Trunking of each type shall be from one manufacturer. Material for steel trunking shall be to BS EN 50085, and partitions and covers shall be of the same material as trunking, as follows: • Class 2: Electroplated zinc having a minimum thickness of zinc coating of 0.0012 mm inside and outside with additional coating of stoved or air drying paint, applied at least to the external surface. • Class 3: Hot dip zinc coated steel to BS EN 10327 or BS EN 10143 and BS EN 10326. Flanges shall be provided for connection of flush floor trunking to vertical trunking to maintain the cross sectional area of compartments with 50 mm minimum radius. Under floor trunking shall be to BS 4678: Part 2, gauge of metal to Table 1 BS 4678, degree of protection Class 3. All sheet steel materials shall be hot dipped galvanized. Service outlet boxes and junction boxes shall be constructed from sheet steel with same finish as trunking. Continuity and segregation of compartments shall be maintained through boxes, with flyovers where necessary. Service outlet boxes shall be provided with separate and segregated access to outlets associated with each wiring compartment. Cable guard or grommet shall be provided to each section. Spigots or adaptors shall be incorporated on boxes for connection to trunking or conduit as appropriate. Frames shall be adjustable on each corner, and lids recessed as indicated. Frame and lids for service outlet boxes and junction boxes, shall be suitable to accept type of floor covering specified. Page 20