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Download NIT - Chittaranjan Locomotive Works - Indian Railway

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Page 31 of 35CLW/ <strong>Chittaranjan</strong>EXPLANATORY NOTES TO SCHEDULEPART- V1. For Item Sl. No. 8 of schedule:The prices shall cover supply, installation, connection and commissioning of Outdoor type Floor mounting feederpillar (IP65) made of high quality Polycarbonate (Shock proof, rust free, corrosion free, acid and chemicalresistant, fire and flame retardant, high impact, made of halogen and silica free recyclable material) UV resistant ,high grade gasket made of Polyurethane and should withstand glow wire test at 960°C. The feeder pillar shouldhold Type Test certificate (CPRI) with switchgear assemblies as per IEC 60 439-1. Feeder pillar board shall beperformed following test.1. Temperature rise test.2. Dielectric properties.3. Short Circuit withstand current- Rated peak & short time withstand current and RatedConditional Short circuit Current4. Effectiveness of Protective Circuits.5. Clearance & Creepage distance.6. Mechanical operation.System Voltage – 415V, 3Ø, 4Wire, 50Hz.Bus bar rating- 250A/ PhaseBus bar size – 12mm. x 10mm. CopperBus bar short time current – 30KA (Peak)Cable entry (Incoming & out going) – from bottomIncoming – 125A, 4P, 415 V, MCCB - 1 No.Outgoing – 20A, SP MCB, 230 V, 10KA – 40 Nos.Cable terminals – Incoming 4 core 150 Sq. mm. Al. conductor XLPE cable.Outgoing 2 core 10 Sq. mm. Al. conductor XLPE cable.Make : MCCB – L&T, SIEMENS, ABB, SCHNEIDERMCB – LEGRAND, STANDARD, SCHNEIDER, MDSMake of enclosure: Hensel/ Emiter2. For Item Sl. No. 10 of schedule:The prices shall cover, supply and installation of cable route marker made up of Cast Iron 150 mm. dia. X 8 mm.thick marked with L.T. Cable to be fitted on M.S angle 50 x 50 x 6 mm. thick , 600mm. long by riveting 2 Nos.rivet and the angle shall be grouted on cement concrete base 300 mm. Length x 300 mm. Breadth x 400mm.Height below ground level.3. For Item Sl. No. 11 of schedule:The prices shall cover Digging of earth pit, supply, installation, connection, testing and commissioning ofMaintenance free long life earthing electrode with following Physical & Technical requirements:Earthing electrode should be Zinc coated at least76.3 mm. Dia. pipe 3.0 Meter long and inner pipe should be 35-40 mm. dia. Thickness of the Outer pipe 16 SWG and inner pipe 14 SWG. The inside filling material should beCrystalline Conductive Mixture having anti corrosive and conductive property. 2 bags each 25 Kg. of Back FillCompound should be provided in each Earth Electrode. The Ohmic value of 2-3 Ohm shall be maintainedregardless of soil and climatic condition.Electrode must be tested from CPRI and must withstand 75.28 KA of Peak Current and 35.85 KA rms for 1second. Testing of the Earthing system will be through calibrated Earth Tester with Two spike system as per IS:3043 carried out by the technical staff to conform the required ohmic value.The job shall also include supply and erection of G.I. flat 50 mm. x 6 mm. thick from the Earth Electrode toDistribution feeder pillar.Make : Ashlok/ Ash Gel/ Ash.Signature of the Tenderer with seal & date Page 31

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