Mahanadi Coalfields Limited Tender

Supplying and fixing of 32A Double Pole Main Switch, Conformity to the specification as per IS/IEC:60947-3:1999 latest, ISI Marked, Switch Fue Unit should contain Enclosure with door, Fuse units- Rewirable,Terminals, Contactors, Operating handle, Utilisation category AC-22A, Warranty (in Years) -1, Rated operational Voltage (in Volt)-240, Rated frequency (in Hz)-50, Number of Pole 2 Pole, Current rating (in Ampere) 32, Rated Insulation voltge (in Volt)-440, Rated impulse withstand voltage (in KV)-3, Rated short circuit breaking capacity, Minimum (in KA, r.m.s.) - 3, Type of enclosure - Surface Mounted, Material of enclosure - CRCA Sheet, 2 mm thick, Knock-outs at enclolsure cable entry - Top and bottom, Mounting holes for fixing the enclosure,Door interlocking facility, Degree of protection IP54, Mechanical Endurance, Minimum (in No.of cycles) - 10000, Type of fuse Rewirable Porcelain Fuse units, Material of terminals- Silver Plated, Material of contactors - Electrolytic copper.

Supplying and fixing of MCB, With Steel sheet enclosure for MCB of 1.2 mm thickness duly pretreated stove enamelled/powder coated, Rated Short circuit capacity (Ampere)- 10000 A, Governing Indian Standard specification IS/IEC 60898-1:2002, Rated Current - 32 A, Instantaneous Tripping Range - C, Rated Voltage (Volt) - 240 V, No of poles/Protected poles(PP) - 2 pole with 2 PP, ISI marking - Yes

Supplying and fixing of Residual Current Operated Circuit -Breakers for Household and Similar Uses conforming to IS: 12640 (Part 1) :2008 /IEC61OO8-I :1996 latest IS: 12640 (Part 1) :2008 /IEC61OO8-I :1996 latest IS: 12640 (Part 1) :2008 /IEC61OO8-I :1996 latest, ISI marked, RCCB type- AC, Rated voltage - 240, Rated frequency 50 Hz, No. of poles - 2, Rated Current (in Ampere) - 40, Rated residual operating current (in Ampere) - 0.03, Rated residual making and breaking capacity -1000 A, Rated conditional short circuit current and Rated conditional residual short circuit current (in Amp) - 10000, Rated impulse withstand voltage - 4 kV, Without time delay, Degree of protection as per IS 12640-I:2008 IP20, EMC Compliance - Yes, Warranty 1 Year

Supplying and fixing of TW Switch Board of Size - 8" x 10" (2 Board per quarter; One for Mains switch and other for RCCB and MCB each)

Fitting of 32A DP Main Switch, 32A MCB and 40A RCCB on board and fixation on wall with connections, testing and commissioning as per direction of the Engineer Incharge.

Stringing of Unarmoured PVC Insulated Sheathed Cable with Aluminium Conductor, twin core 10 sq. mm per quarter for service connection as per the direction of the Engineer Incharge.

Supply of maintenance free earthing electrode,47 mm dia,3 mtr length single pipe technology pipe fitted with highly conductive compound 25 kg x 2 bag with earth pit cover. Specification of Earth Electrode: Length-3mtr length, Nominal Diameter-47mm, Thickness of copper coating:250 Microns(Molecular bonding), Steel core:1035 steel cold drawn to ASTM A 1080 and AISI C 1017 standards, Tensile strength- Min. 90000psi, Copper used for coating :DHP alloy No. 122 CDA and rated at 99.95% copper.Specification of Conducting compound: Permanent and maintenance free( no recharging with salts or any other materials, sets firmly and maintain its eath resistance with time, does not dissolve or decompose or otherwise pollute the soil or the local water table, suitable for use in dry form or slurry form, does not dependent on the continuous presence of water or moisture in the surrounding to maintain its conductivity, in its set form shall have a resitivity of less than 0.07ohm-m, Conforms to IEC 62561 Part-7- requirement of earthing enhancing compound, has better hygroscopic properties and maintains moisture around the earth electrode, non toxic, non reactive, non explosive and non corrosive, suitable for any kind of electrode and all kinds of soils of differnet resistivity. Earth Pit Cover - Made of Heavy duty Fibre Reinforced Plastic, High load bearing capacity, Eco friendly, maintenance free, Locakable arrangement through stainless steel nut bolt/ screw, Factory built holes for cable routing the strip or cable for interconnection, Zero water absorption and resistant to sunlight rays, Weather proof , Dimension- At Top-254mm, Bottom- 330mm, Height-260mm. Copper Coated Strip: Length : 3 mtr, Nominal Width - 25mm, Nominal Thickness-3mm, Thickness of copper coating:250 microns(Molecular bonding), Holes on either end for connection to other strips, Steel core: 1035 steel cold drawn to ASTM A 1080 and AISI 1017 standards, Tensile strength- Min. 90000psi, Copper used for coating :DHP alloy No. 122 CDA and rated at 99.95% copper. Accessories-bolts,nuts,flat washer,spring washer of suitable size,Installation manual

Installation and testing of maintenance free earthing electrode

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