SITC OF LT Switch gear for Doordarshan, HPT Vizag - All India Radio

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f. Designation for all components, viz., switches, fuses,relays, etc., mounted in the cubicle shall also be done.2.8 EARTHING : Compliance2.8.1 A continuous earth bus as specified in the data sheet shallbe provided for the entire length of the switchboard. Aminimum of two terminals shall be provided on the bus forexternal connection to earth grid.2.8.2 All panels shall be effectively bounded to a switchgear earthbus of galvanized steel. Positive earthing shall also bemaintained in all positions of chassis and breaker frame.2.8.3 All non-current carrying metallic parts of the equipmentshall be earthed.2.8.4 All hinged doors and covers shall be provided with suitableflexible earthing connections.2.8.5 The size of the earth bus chosen shall be to withstand fullfault current.2.8.6 Earth bus bars shall be supported at suitable intervals.2.8.7 All withdraw able chassis shall be earthed through springloaded silver plated copper scrapping earth contact whichmake-before & break-after the power contacts areengaged/disengaged. A suitable vertical earth bus shall beprovided for each front of the panel for this purpose.2.9 PAINTING :2.9.1 All metal surfaces shall be thoroughly cleaned and degreasedto remove mill scale, rust, grease, dirt, etc.,Fabricated structure shall be picked and then rinsed toremove any trace of acid. The under surface shall beprepared by applying a coat of phosphate paint and coat ofyellow zinc chromate primer. The under surface shall bemade free from all imperfections before undertaking thefinishing coat.2.9.2 The phosphate coating shall be sealed by the application oftwo coats of ready mixed zinc chromate primer.2.9.3 After application of the primer, two coats of finishingsynthetic enamel paint shall be applied or shall be powdercoated epoxy based (second coat to be applied aftercompletion of tests).2.9.4 The finished panels shall be dried in staving ovens in dustfree atmosphere. Panels finish shall be free fromimperfections like pinholes, orange peels, runoff paint, etc.,2.9.5 All unpainted steel parts shall be cadmium plated orsuitable treated to prevent rust formation. If these parts aremoving elements, then they shall be greased.2.9.6 A small quantity of finishing paint shall be supplied forminor touch up required at the site after the installation ofthe switchgear.2.9.7 Whenever called for in particular projects, the completedswitchboards shall be painted with peel-able paint.2.9.8 Vendor shall furnish detailed painting procedure proposedalong with the bid.2.10 PACKING :2.10.1 The switchboard shall be shipped to site packed in fullwooden packing cases. They shall be wrapped inpolyethylene sheets before being placed in cases to preventdamages to the finish. Cases shall have skid bottoms forhandling.12
2.10.2 The board shall be properly packed before dispatch to avoiddamage during transport, storage and handling to all siteanywhere in India.2.10.3 The packing box shall contain a copy of the installation,operation and maintenance manual.2.10.4 A sign to indicate the upright position of the panels to beplaced during transport and storage shall be clearly marked.Also proper arrangements shall be provided to handle theequipment.2.11 TESTS & INSPECTIONS : Compliance2.11.1 Switchgear shall be subject to routine tests as per IS 86232.11.2 All meters and other reference devices used for testing shallhave valid calibration from reputed nationallaboratories/institutes. Inspection by purchases will not becarried out unless the vendor confirms that equipment areready for proceeding with the tests.2.11.3 Shop test shall be witnessed by our inspector or owner or anagency authorized by us.2.11.3 Acceptance tests on completed switchboards shall be asfollows :a) A general visual check shall be carried out. Thisshall cover measurement of overall dimension,location, number and type of devices, terminalboxed, location and connection of terminals, etc.,b) Checking of bill of materials as per approveddrawingc) Checking of operation of various feeders as perapproved schematic drawingsd) Operation check shall be carried out for everycontrol function as per schematic drawings bymanually simulating fault conditions and operationof control switches/relay, etc.e) Checking of interchangeability of identical feeders.f) Insulation resistance test and value measurementon power and control circuits before and after highvoltage withstand testg) For equipment bought from other suppliers, certifiedtest reports of test carried out at the manufacturer’sworks shall be submitted.h) Functional check of all Instruments / Indicators.i) Calibration of protective relays for circuit currentvalue.2.12 DOCUMENTATION :Following documents shall be submitted along withthe bid :a) General arrangement and foundation details ofthe Main LT Panelb) Bus bar sizing calculation for various bus barrating of the Main LT Panelc) Quality assurance plan for the switchboards.2.13 DRAWINGS & INSTRUCTIONS MANUALS :2.13.1 All drawings submitted by the vendor shall be in sufficientdetail to indicate the type size, arrangement, weight,breakdown for packing and shipment, the externalconnections, fixing arrangements required, the dimensionsrequired for installation and interconnections with other13
Page 1 and 2: SPEED POSTPRASAR BHARATI(Broadcasti
Page 3 and 4: 8. DELIVERY OF STORES: The SITC of
Page 5 and 6: (d) Where action is taken under sub
Page 7 and 8: GENERAL :1.1.12 The switchgear shal
Page 9 and 10: shall be compartmentalized and full
Page 11: 2.1.4 It shall have robust level ge
Page 15 and 16: SCHEDULE OF REQUIREMENT OF LT PANEL
Page 20 and 21: ANNEXURE-IIGENERAL TERMS AND CONDIT

SITC OF LT Switch gear for Doordarshan, HPT Vizag - All India Radio

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