NO/HED/56/2026-27

Designing, Supply, erection, testing & commissioning of 16 mtr stadium High Mast with power tool based on the following parameters requirements of the Dept. The power tool 3 phase motorized 1.1 KW. complete in all respects should be installed in the pole of reputed make ISI marked only. includes (item 1.01 to 1.20)

Height of Mast:-16 Mtr (Including the height of head frame). ii) Wind speed:- 47 m/s as per IS-875 (Part-III) in) The High Mast & head frame shall be structurally suitable to accommodate the 18 Nos 500 Watt LED fitting & its control gear boxes, iv) The entire high mast structure (Internally & externally) and all MS parts shall be hot dip galvanized as per BSEN ISO 1461 or equivalent

Manufacture of the Mast: The High Mast section should be manufactured with High steel grade in compliance with BSEN 10025/D in 17100 and reference standards for the High mast shall be as under the firm will supply test reports/documents for confirmation to various standards.

a) Code No. 1.S. 875 (Part III) 1987 Amended up to date Title Code and practice for design loads for structures.b) BSEN 10025 Grades of M.S. plates c) BS. 5135/AWS Welding d) BS 729 ISO 1461 Galvanizing e) TR7. 2000 of ILE, UK Specification of Mast and foundation.ISO 9001/14001/1 8001 To be quoted by the firm g) Type test, Winch Test, wind tunnel test To be submitt

Structure: Continuously tapered polygonal with no circumference weld on shaft.

Type of joint Telescope slip joints (Stress fit)

Lantern carriage fabrication A Fabricated Lantern carraige shall be provided for fixing and holding the flood the flood Light fittings and the control gear boxes. The Lantern carriage shall be of special design and shall be of steel tube contruction The tubes acting as conduits for wire with holes fully protected by grommets. The lantern carriage shall be designated and fabricated to hold the required number of flood light fittings and the control gear boxes and also have a perfect self balance the lantern carriage carriage shall be fabricated into halves and joined by bolted flanges with stainless steel bolts and mylod type stainless steel nuts to enable easy installation or removal from the erected mast. The inner lining of the carriage shall be provided with protective PVC arrangements, so that no damage is caused to the surface of the mast during the raising and lowering operation of the lantern carriage Junction box Weather proof Junction box made of cast aluminium shall be provided on the carriage assembly as required, from which the inner connections to the designed number of the flood light luminaries and associated control gears fixed on the carriagee shall be made.

Electrical System, cable and cable connections. A suitable terminal box shall be provided as part of the contract at the base compartment of the high mast for terminating the incoming cable. The electrical connections from the bottom to the top shall be made by special trailing cable. The cable shall be EPR insulated and PCP sheathed to get flexibility and endurance. Size of the cable shall be minimum 6 core 2.5 mm copper. The cable shall be of reputed make there shall be two such cables. One for essential circuit and other for non essential supply per mast At the top there shall be weather proof junction boxes to terminate the trailing cable Connections from the top junction box to the individual luminaries shall be made by using 3 core 1.5 sq. mm flexible PVC Cu. Wires of reputed make. The system shall have in built facilities for testing the luminaries while in the lower position. Also, suitable provision shall be made at the base compartment of the mast to facilitate the operation of externally mounted, electrically operated power tool for raising and lowering of the lantern carriage assembly The trailing cables of the lantem carriage rings shall be terminated by means of specially designed, metal clad, multiping plug and socket provided in the base compartments to enable easy disconnection when required

Door Opening: An adequate door opening shall be provided at the base of the mast and the opening shall be such that it permits clear access to equipment like winches, cables, plug and socket etc. and also facilitate easy removal of the winch. The door opening shall be completed with at close fitting, vandal resistant, weather proof door, provided with a heavy duty double internal lock with special paddle key. A provision shall be made for connectivity the external power tool for raising or lowering the lantern carriage. The door opening shall be carefully designed and reinforced with welded steel section, so that the mast section at the base shall be unaffected and undue buckling of the cut portion is prevented. Size of door opening shall not be more than 1200 x 280 mm to avoid buckling of the mast section under heavy wind conditions