Construction Features FABRICATION: Frames, Load bearing members, Large door: 2 mm thick Small doors, shrouds, Partitions: 1.6 mm thick Gland Plates : 3 mm thick Base: ISMC-75 CONSTRUCTIONS: Vertical structure is necessarily welded together to provide strength/stability and rigidity. However, each vertical section is bolted together to form a continuous assembly of panels. Each vertical section is provided with pre-determined punched holes/slots for vertical adjustment of compartment size. Partitions between two modules are bolted to the structure. The compartments are made of modular section and each module size can be changed at later date even at site – this is achieved because of bolted construction. Such bolted construction leads to greater flexibility. Each vertical section has 1800 mm space available for feeders. This1800 mm space is divided in 18 parts of 100 mm or 16 parts of 112.5 mm height. This allows us 8 of 225 mm or 6 compartments of 300 mm. Bolted construction allows for future adaptability or even changes can be made at site if required. Such flexible (vertically) arrangement of compartments is achieved without the need to cut / re-weld / repaint horizontal members. The lowest & highest terminals are at 350 mm/1900 mm from ground level. Electrolytic grade of aluminium with black heat shrink sleeves (joints/connections are bare). With color coding at regular intervals. PAINT: Powder Coated RAL 7032 (Siemens Grey) throughout or any other shade as per customer’s need. Each front can be approached from Respective fronts. The horizontal bus bar chamber is common to both fronts. PRE-TREATMENT PROCESS CABLE ENTRY: From bottom REAR ACCESS: Essential CABLE GLANDS: Not included CABLE LUGS: Not included BUS BAR: A common horizontal bus bar is provided while each front of double front construction would have independent VBB. Each VBB would be easily approachable from respective fronts. Each VBB has a nut plate so that connections can be approached from front only. Bus bar sizes are mentioned in BOQ. 9. EARTH BUS: 6 mm x 25 mm GI throughout the length. DEGREE OF PROTECTION: IP – 52 CONTROL WIRE: PVC insulated copper flexible 1.5 sq.mm. (2.5 sq. mm. CT secondary) POWER CONNECTIONS: PVC insulated copper flexible minimum 2.5 sq.mm. Aluminium flats above 125 A rating. DOORS / COVERS : Feeder compartments: hinged with quarter turn bakelite knobs (unshrouded). Below door knobs a special nylon haxagonal washer is used so that the paint below door knobs is not spoilt. Cable alley: hinged with bolts on other side. Bus bar chamber & back: bolted covers. CONTROL TERMINALS: 6 sq.mm Elmex make. GASKET: Special expandable gasket is provided which ensures proper dust tight environment. The gasket has additional fins on its sides to provide friction so that it does not come out of its groove. DOOR HINGES: Bolted or screwed. Between two metal surfaces, a small nylon washer is provided so that the paint is not scratched.
