1. 8mtr 200Kg PSC Pole 2. 9mtr 300Kg PSC Pole

Transcription

1 SECTION - V Group -A Technical Specification of 1. 8mtr 200Kg PSC Pole 2. 9mtr 300Kg PSC Pole TECHNICAL SPECIFICATIONS I. Applicable Standard: The Poles shall comply with latest standards as under: REC Specification No. 15/1979, REC Specification No. 24/1983, IS 1678, IS 2905, IS II. Materials: Cement: Cement to be used in the manufacture of pre-stressed concrete poles shall be ordinary for rapid hardening Portland cement confirming to IS: (Specification for ordinary and low heat Portland cement) or IS: 8041 E-1978 (Specification for rapid hardening Portland cement). Aggregates: Aggregates to be used for the manufacture of pre-stressed concrete poles shall confirm to IS:383 (Specification for coarse and fine aggregates from natural sources for concrete) The nominal maximum sizes of aggregates shall in no case exceed 12 mm. Water: Water should be free from chlorides, sulphates, other salts and organic matter. Potable water will be generally suitable. Admixture: Admixture should not contain Calcium Chloride or other chlorides and salts which are likely to promote corrosion of pre-stressing steel. The admixture shall conform to IS: Pres-Stressing Steel: Pre-stressing steel wires including those used as un tensioned wires should conform to IS:1785 (Part-I) (Specification for plain hard-drawn steel wire for pre-stressed concrete, Part-I cold drawn stress relieved wire).is:1785 (Part-II)(Specification for plain hard-drawn steel wire) or IS:6003 (Specification for indented wire for pre-stressed concrete).the type design given in the annexure are for plain wires of 4 mm diameter with a guaranteed ultimate strength of 160 kg/mm². All pre-stressing steel shall be free from splits, harmful scratches, surface flaw, rough, aged and imperfect edges and other defects likely to impair its use in prestressed concrete. Concrete Mix: Concrete mix shall be designed to the requirements laid down for controlled concrete (also called design mix concrete) in IS: (Code of practice for pre-stressed concrete) and IS: (Code of practice for plain and reinforced concrete) subject to the following special conditions: Minimum works cube strength at 28 days should be at least 420 Kg/cm². The concrete strength at transfer should be at least 210 Kg/cm². The mix should contain at least 380 Kg of cement per cubic meter of concrete. The mix should contain as low water content as is consistent with adequate workability. It becomes necessary to add water to increase the workability the cement content also should be raised in such a way that the original value of water cement ratio is maintained. III. Design Requirements The poles shall be designed for the following requirements: The poles shall be planted directly in the ground with a planting depth as per IS: Wherever,

2 planting depth is required to be increased beyond the specified limits or alternative arrangements are required to be made on account of ground conditions e.g. water logging etc., the same shall be in the scope of the bidder at no extra cost to owner. The bidder shall furnish necessary design calculations/details of alternative arrangements in this regard. The working load on the poles should correspond to those that are likely to come on the pole during their service life. The factor of safety for all poles 9.0Mts. Shall not be less than 2.0 and for 8.0 M poles, the factor of safety shall not be less than 2.5. The average permanent load shall be 40% of the working load. The F.O.S. against first load shall be 1.0. At average permanent load, permissible tensile stress in concrete shall be 30 kg/cm². At the design value of first crack load, the modulus of rupture shall not exceed 53.0kg/cm² for M-40. The ultimate moment capacity in the longitudinal direction should be at least one fourth of that in the transverse direction. The maximum compressive stress in concrete at the time of transfer of pre-stress should not exceed 0.8 times the cube strength. The concrete strength at transfer shall not be less than half, the 28 days strength ensured in the design, i.e. 420x0.5=210kg/cm². For model check calculations on the design of poles, referred to in the annexure, a reference may be made to the REC Manual on Manufacturing of solid PCC poles, Part-I-Design Aspects. IV. Dimensions and Reinforcement The cross-sectional dimensions and the details of pre-stressing wires should conform to the particulars given in the enclosed drawing. The provisions of holes for fixing cross-arms and other fixtures should conform to the REC specification No.15/1979. All pre-stressing wires and reinforcements shall be accurately fixed as shown in drawings and maintained in position during manufacture. The un-tensioned reinforcement as indicated in the drawings should be held in position by the use of stirrups which should go round all the wires. All wires shall be accurately stretched with uniform pre-stressed in each wire. Each wire or group of wires shall be anchored positively during casing. Care should be taken to see that the anchorages do not yield before the concrete attains the necessary strength. V. Cover The cover of concrete measured from the outside of pre-stressing tendon shall be normally 20 mm. VI. Welding and Lapping of Steel The high tensile steel wire shall be continuous over the entire length of the tendon. Welding shall not be allowed in any case. However, joining or coupling may be permitted provided the strength of the joint or coupling is not less than the strength of each individual wire. VII. Compacting Concrete shall be compacted by spinning, vibrating, shocking or other suitable mechanical means. Hand compacting shall not be permitted.

3 VIII. Curing The concrete shall be covered with a layer of sacking, canvass, Hessian or similar absorbent material and kept constantly wet up to the time when the strength of concrete is at least equal to the minimum strength of concrete at transfer of pre-stress. Thereafter, the pole may be removed from the mould and watered at intervals to prevent surface cracking of the unit the interval should depend on the atmospheric humidity and temperature. The pre-stressing wires shall be de-tensioned only after the concrete has attained the specified strength at transfer (i.e. 200 or 210 kg/cm² as applicable).the cubes cast for the purpose of determining the strength at transfer should be coursed, a sear as possible, under condition similar to those under which the poles are cured. The transfer stage shall be determined based on the daily tests carried out on concrete cubes till the specified strength indicated above is reached. Thereafter the test on concrete shall be carried out as detailed in IS: 1343(code of practice for pre-stressed concrete). The manufacture shall supply, when required by the owner or his representative, result of compressive test conducted in accordance with IS: 456 (Code of practice for plain and reinforced concrete) on concrete cubes made from the concrete used for the poles. If the manufacture so desired, the manufacture shall supply cubes for test purpose and such cubes shall be tested in accordance with IS: 456 (Code of practice for plain and reinforced concrete). IX. Lifting Eye-Hooks or Holes Separate eye-hooks or hoes shall be provided for handling the transport, one each at a distance of 0.15 times the overall length, from either end of the pole. Eye-hooks, if provided, should be properly anchored and should be on the face that has the shorter dimension of the cross-section. Holes, if provided for lifting purpose, should be perpendicular to the broad face of the pole. X. Holes for Cross Arms etc Sufficient number of holes shall be provided in the poles for attachment of cross arms and other equipments. XI. Stacking & Transportation Stacking should be done in such a manner that the broad side of the pole is vertical. Each tier in the stack should be supported on timber sleeper located as 0.15 times the overall length, measured from the end. The timber supported in the stack should be aligned in vertical line. XII. Earthing (a) Earthing shall be provided by having length of 6 SWG GI wire embedded in Concrete during manufacture and the ends of the wires left projecting from the pole to a length of 100mm at 250 mm from top and 1000 mm below ground level. (b) Earth wire shall not be allowed to come in contract with the pre-stressing wires B. PSC Pole (8 Mtr x 200 Kg, 9 Mtr x 300 Kg) GUARANTEED TECHNICAL PARTICULARS (To be submitted along with offer) Sl No. Description Unit Bidder s Offer 8 Mtr x 200 Kg 9 Mtr x 300 Kg 1 Type of pole 2 Factor of Safety 3 Overall Length of Pole Meters meters 4 Working Load Kg Kg

4 5 Overall Dimensions A Bottom Depth mm B C Top Depth Breadth 6 Reinforcement Detail: 7 Diameter of prestressing wire 8 No. of Tensioned wires 9 No. of Untensioned wire 10 Length of each untensioned wire 11 Concrete Detail A B C D E Cement Type Grade Type Quantity Standard confirming to: Cubic meter/pole 12 Steel Quality Kg/Pole A B Ultimate Tensile Strength (UTS) Weight Km/Cm² NB: Transportation charges by lorry: The Firms, quoting for PSC poles must quote the rates for transportation or else the offers shall not be considered. Group-B 11KV V Cross Arm: The cross arm is to be made out of I.S.M.C., M.S. Channel 75 x 40 mm ( as per IS : 2062, 808, & ) ( Sp. Wt. 6.8 Kg / Mtr ) with both side flat packing at GI Pin points with two Coats of Red Oxide Painting ( Approximate Weight of 10.0 Kg Each, with tolerance on Sp. weight per meter shall be + / - 4 % for steel ). Others as per REC - Construction Standard.

5 Group-B: MS Clamp Back Clamp for 11 KV V Cross arm: Back clamp for 11 KV V cross arm made out of 50x8 mm MS Flat suitable for 9mx300 Kg PSC poles After fabrication the cross arm shall be painted with two coats of Red Oxide primer, conforming to REC construction standard & drawing MS Clamp for HT Stay set : HT stay clamp suitable for PSC poles made out of 50x8 mm MS Flat, confirming to latest IS Specification. MS Clamp for LT Stay set : LT stay clamp suitable for PSC poles made out of 50x6 mm MS Flat, confirming to latest IS Specification. Group-C 11KV GI Pin: 11 KV GI Pin: - Confirming to IS-2486 Part-I/1971. (a)the pins shall be of single piece obtained by the process of forging. They will not be made by any process using more than one piece of material. The pin will have good finish, free from flaws and other defects. The finish of the collar shall be such that a sharp angle between the collar and the shank is avoided. All ferrous pins, nuts and washers, except those made of stainless steel shall be galvanized by hot dip process. Other fittings, i.e flat washers and spring washers may be electro-galvanized as per IS:2486. The threads of nuts, and toped holes, when cut after galvanization shall be well oiled or greased. (b) The pins shall be as per relevant figure indicated in IS 2486 (part II) having stalk length of 165 mm and shank length of 150 mm with minimum failing load of 10 KN with large heads and shall match with the pin type insulators with cemented zinc thimble having similar threads. TESTS: The pins shall be tested as per IS: 2486 (part-1):1993 Type Test: The bidder has to enclose the reports of the following type tests carried out in any govt. recognized laboratory along with the bid documents. (a) Checking of Threads on Heads (b) Galvanizing Test (c) Visual Examination (d) Mechanical Test. Acceptance Tests: Following tests shall be carried out at the works of the manufacturer before dispatch. (a) Checking of Threads on Heads (b) Galvanizing Test (c) Visual Examination (d) Mechanical Test.

6 GURANTEED TECHNICAL PARTICULARS Slno. General Technical Particulars Bidder s Offer 1. Manufacturer s name & Address 2. Standard applicable specification 3. Minimum failing load 4. Dimensions (mm) a. Total length b. Shank length c. Stalk length 5. Type of threads 6. Threads per Inch 7. Type of galvanization of pin & nuts 8. Mass of zinc (minimum) 9. Applicable specification 10. No. of Nuts with each pin & its size 11. No. of spring washer with each pin & its size 12. Packing details a. Type of packing b. Weight of each pin approx, (with nut & washers) c. No. of Pins in each packing (Kg) 13 Tolerance in weight / dimensions, if any 14 I.S.I. Certificate License number 15 Any other relevant information the bidder would like to indicate 16 Manufacturer s Trade mark with each GS Pins 17 Whether drawing has been submitted by the bidder Group-D Insulators: 1KV Pin Insulator 11 KV Pin Insulators: - IS-731/77 (Porcelain Insulator for O/H power lines with nominal voltage greater than 1000 volts. Design and Construction The material shall conform in all respect to the relevant Indian standards with latest amendments indicated below. Indian Standards Title BIS:731/1976 Porcelain insulators for overhead power lines with a nominal voltage greater than 1000V BIS:2486 (Part-1 to Part-4) Metal fittings of insulators for overhead power lines with nominal voltage greater than 1000V BIS: Porcelain insulators for overhead power lines with a nominal voltage upto and including 1000V REC SPEC : 3/ KV Porcelain insulators and fittings REC SPEC : 21/1981 Guy Insulator (Stay Insulator) General Requirement for 11KV Pin Insulator All insulators for 11KV shall conform to Type B of latest version of IS: 731. Insulator shall be as per enclosed drawing. Pin insulator shall consist of a single piece of porcelain, intended to be mounted rigidly on supporting structure by a pin, which passes up inside the insulator. The pin type insulator shall have a top groove and shall be threaded to take mild steel pins. The profile of threads shall be as per IS: 1445.

7 Insulators shall confirm the following specific conditions of I.S. given below Insulator Designation Minimum Mechanical Minimum Creepage Failing Load Distance 11KV Pin Insulator Type B of IS:731 10KN 320mm Tests: The insulators shall comply with the following tests as per IS: Type tests (a) Visual examination (b) Verification of dimensions (c) Visible discharge test (d) Impulse voltage withstand test. (e) Wet power-frequency voltage withstand test. (f) Temperature cycle test. (g) Electro-mechanical failing load test. (h) Mechanical failing load test (for those of type B string insulator units to which electro mechanical failing load test (g) is not applicable. (i) Twenty four hours mechanical strength test (for string insulators only when specified by the purchaser). (j) Puncture test (k) Porosity test and (l) Galvanising test. Acceptance Tests The test samples after having withstood the routine tests shall be subjected to the following acceptance test in the order indicated below: (a)verification of dimensions. (b)temperature cycle test. (c)twenty four hours mechanical strength test(for string insulator units only when specified by the purchaser) (d)electro-mechanical failing load test. (e)puncture test (f)porosity test and (g)galvanising test. Routine Test (a) Visual examination. (b) Mechanical routine test(for string insulator units only) and (c) Electrical routine test(for string insulator units only) Marking Each Insulator shall be legibly and indelibly marked to show the following. (a) Name and trade mark of the manufacturer. (b) Month and year of manufacture (c) Minimum failing load in Newtons (d) Country of the manufacturer and (e) ISI Certification mark,if any. (f) Specific Parameters & Layout Conditions. Marking on porcelain shall be printed and shall be applied before firing. Packing All insulators (without fittings) shall be packed in wooden crates suitable for easy but rough handling and acceptable for rail transport. Where more than one insulator are packed in a crate, wooden separators shall be fixed between the insulators to keep individual insulators in position without movement within the crate.

8 GURANTEED TECHNICAL PARTICULARS OF 11 KV PIN INSULATOR Slno. Description Bidder s Offer 1 Manufacturer s name 2 Address of manufacturer 3 Location of type testing 4 Applicable standard 5 Type of insulator (Porcelain or toughened glass) 6 Dry impulse withstand voltage 7 Wet power frequency, 1 minute, withstand voltage 8 Dry, Critical Impulse Flashover Voltage 9 Dry, power frequency, Critical Flashover Voltage 10 Wet, power frequency, Critical Flashover Voltage 11 Power frequency Puncture Voltage 12 Safe Working Load 13 Minimum Failing Load 14 Creepage Distance 15 Protected Creepage Distance 16 Type and Grade of Materials : Insulator 17 Type and Grade of Materials : Thimble 18 Type and Grade of Materials : Cement 19 Type of semi conducting Glaze 20 Radius of Conductor Groove 21 Colour of Insulator 22 Weight of Insulator 23 Number of Insulators per Crate 24 Gross Weight of Loaded Crate 25 Whether drawing showing dimensional details have been furnished along with Bid 26 Whether Type Test Certificates have been furnished 27 Other particulars (if any) 11 KV DISC INSULATOR 70 KN (B&S TYPE): Scope- This specification covers the manufacture, testing and works supply and delivery of 11KV Disc insulators. The Porcelain insulators shall conform to IS: ammended up-to date. Insulators shall be of B&S type. Disc insulators made of glazed porcelain shall be used as insulators on dead ends or on suspension type lines of 11 KV and above. B&S type disc insulators of mechanical strength not less than 70 KN shall be used confirming to IS: 731/1971. These shall be mounted on metallic cross-arms with the help of suitable non-magnetic galvanised iron hardware fittings. Small fittings like spring washers, nuts etc may be electro- galvanised. System conditions: Frequency : (50 ± 3%)Hz Nominal System Voltage : 11 K V Maximum System Voltage : 12KV No. of phases : 3 Power frequency one minute withstand (Dry): 75KV Neutral Earthing arrangement: Effectively Earthed

9 General Requirements i. Conductors : The Disc Insulators will be used on lines on which the conductors will be AAA Conductor of size up to 100 sq.mm. The insulators should withstand the conductor tension, the reversible wind load as well as the high frequency vibrations due to wind. ii. Type: Diameter of porcelain disc insulator shall be 280mm. The center to center distance between B&S shall be 170mm. iii. Insulator Ends. Disc Insulators shall have Ball & Socket ends. The colour of the units shall be brown for 70 KN Disc Insulators. Electromechanical & Mechanical Strength : The electromechanical strength of the individual and the complete Disc shall be 70KN applied axially. Creepage Distances : The minimum creepage distance for each disc Insulator shall 400 mm. Tests : Suitable number of individual units shall be subject to the following tests in accordance with IS:731/1971 with its latest amendments. (a). Type Tests : Following Type test shall be carried out on porcelain insulators as specified in IS: 731 / 1971 amended up to date. 1. Visual Examination. 2. Verification of dimensions. 3. Visible Discharge Test. 4. Impulse voltage withstand test. 5. Impulse voltage flashover test. 6. Wet one Minute Power Frequency withstands test and West Flashover test. 7. Temperature Cycle test. 8. Electromechanical failing load test. 9. Power frequency puncture withstand test. 10. Porosity test. 11. Galvanizing test. b. Acceptance Tests : The test samples after having withstood the routine test shall be subject to the following acceptance tests in order indicated below: 1. Verification of dimensions. 2. Temperature Cycle test. 3. Twenty four hour mechanical test. 4. Electromechanical failing load test. 5. Power Frequency puncture withstand test. 6. Porosity test. 7. Galvanizing test. C. Routine Tests: (i) Visual Examination (ii) Mechanical test (iii) Electrical test (iv) Twenty four hours mechanical test (v) Electro mechanical failing load test

10 Test Certificate : The Bidder shall furnish detailed type test reports of the offered Disc Insulators as per clause 6.A of the Technical Specifications at the NABL approved laboratories to prove that the Disc Insulators offered meet the requirements of the specification. These Type Tests should have been carried out within five years prior to the date of opening of this tender. Testing Facilities : The Bidder must clearly indicate what testing facilities are available in the works of the manufacturer and whether facilities are adequate to carry out all Routine & acceptance Tests. These facilities should be available to Purchaser s Engineers if deputed or carry out or witness the tests in the manufacturer works. If any test cannot be carried out at the manufacturer's work, the reasons should be clearly stated in the tender. The insulators shall be tested in accordance with the procedure detailed in IS-731/1971 amended up to date. Mechanical Design : The design shall be such that stresses due to expansion and contraction in any part of insulator shall not lead to deterioration. Cement used in manufacture of the insulators shall not cause fracture due to expansion or loosening due to contraction. Drawings : The tender shall be accompanied with the detailed drawings showing the dimensions of the individual Disc, giving all the design dimensions of various component parts. Generally it shall be as per IS. Markings : Each insulator shall be legibly and indelibly marked to show the following: a) Name or trade mark of the manufacturer. b) Voltage Type c) Month and year of manufacturing. d) Electromechanical strength in KN e) Country of Manufacturer f) ISI certificate mark Packing : All insulators shall be packed in crates or boxes suitable for rough handling. Packing shall be marked with the strength and KV rating. 11 KV STAY INSULATOR: Conforming to IS: with latest amendments. LT STAY INSULATOR: Conforming to IS: with latest amendments. GURANTEED TECHNICAL PARTICULARS (To be submitted along with Bidder s offer) Sl. no. Description Unit 11KV Stay Insulator 1 Manufacturer s name LT Stay Insulator 2 Address of manufacturer 3 Location of type testing 4 Applicable standard & Type 5 Type of insulator (Porcelain or toughened glass) 6 Dry impulse withstand voltage 7 Wet power frequency, 1 minute, withstand voltage

11 8 Dry, Critical Impulse Flashover Voltage 9 Dry, power frequency, Critical Flashover Voltage 10 Wet, power frequency, Critical Flashover Voltage 11 Power frequency Puncture Voltage 12 Safe Working Load 13 Minimum Failing Load 14 Creepage Distance 15 Protected Creepage Distance 16 Type and Grade of Materials : Insulator 17 Colour of Insulator 18 Weight of Insulator 19 Number of Insulators per Crate 20 Type of semi conducting Glaze 21 Minimum dia of Stay wire hole 22 Whether drawing showing dimensional details have been furnished along with Bid 23 Whether Type Test Certificate have been furnished 24 Other particulars (if any) Group-C: 11 KV H.W. Fittings ( B & S Type) ( 70 KN ) The Tension Hard Ware Fittings are to be suitable for the AAA Conductor sizes up to 55 mm2 as per IS : 2486 / Part I 1993, Part II 1989 & Part IV 1981 and their latest amendments, if any with minimum failing load of Hard Ware not less than the permissible limit of Breaking load / Ultimate tensile strength for particular conductor as per IS. This should be bolted type having minimum 3 Nos of U bolts & provided with a suitable tongue. The minimum failing load will be not less than 70 KN. N.B.: For all types of H.W. Fittings 1. Galvanization: - All ferrous parts should be galvanized as per IS / 1972 or it s latest amendments if any & all non-ferrous part should be duly electroplated with silver. 2. Type Test Certificate: - The Type Test Certificate, conducted within five years before the date of opening of tender from Govt. Testing Laboratory (NABL accredited) // CPRI shall be submitted. The Certificate from a Testing Laboratory (NABL accredited) regarding composition of copper in electrolytic copper casting and galvanization as per ISS is to be furnished during inspection of materials.

12 3. Drawing: - To be furnished by Bidder. The details of construction and materials of different parts shall clearly be indicated in the drawing and illustrative pamphlet/ literature for the same shall be submitted along with the tender. Group- C 18mm HT GI Stay Set : & 16mm LT Stay Set: TECHNICAL SPECIFICATION OF LT AND HT STAY SET 1. SCOPE This specification covers design, manufacture, testing and dispatch of GI Say Sets of 1 6 mm and 18 mm GI Stay Sets GENERAL REQUIREMENTS mm dia Stay sets (Galvanized) LT Stay Set This stay sets (Line Guy set) will consist of the following components: Anchor Rod with one washer and Nut Overall length of rod should be 1800 mm to be made out of 16 mm dia GS Rod, one end threaded up to 40 mm length with a pitch of 5 threads per cm and provided with one square GS washer of size 40X40x1.6mm and one GS hexagonal nut conforming to IS:1367:1967 & IS:1363:1967. Both waster and nut to suit threded rod of 16 mm dia. The other end of the rod to be made into a round eye having an inner dia of 40mm with best quality welding Anchor Plate Size 200 x 200 x6 mm To be made out of GS plate of 6 mm thickness. The anchor plate should have at its centre 18 mm dia hole Turn Buckle & Eye Bolt with 2 Nuts To be made of 16 mm dia GS Rod having an overall length of 450mm, one end of the rod to be threaded up to 300 mm length with a pitch of 5 threads per cm and provided with two GS Hexagonal nuts of suitable size conforming tois:1363:1967 & IS:1367:1967. The other end of rod shall be rounded into a circular eye of 40mm inner dia with proper and good quality welding Bow with Welded Angle To be made out of 16mm dia GS rod. The finished bow shall have an over all length of 995 mm and eight of 450 mm, the apex or top of the bow shall be bent at an angle of 10 R. The other end shall be welded with proper and good quality welding to a GS angle 180 mm long having a dimension of 50x50x6mm. The angle shall have 3 holes of 18 mm dia each Thimble To be made on 1.5 mm thick GS sheet into a size of 75x22x40mm and shape as per standard shall be supplied. Average Weight of Finished 16mm Stay Sets shall be at least KG (Minimum) (Excluding Nuts Thimbles and Washer) Kg. (Maximum) mm dia. Stay sets (Galvanized) HT Stay Set This stay sets (Line Guy set) will consist of the following components:-

13 2.2.1 Anchor Rod with one washer and Nut Overall length of rod should be 1800 mm to be made out of 18 mm dia GS Rod, one end threaded up to 40 mm length with a pitch of threads per cm and provided with one square GS washer of size 50X50x1.6mm and one GS hexagonal nut conforming to IS:1367:1967 & IS:1363:1967. Both waster and nut to suit threded rod of 18 mm dia. The other end of the rod to be made into a round eye having an inner dia of 40mm with best quality welding Anchor Plate Size 300 x 300 x8 mm To be made out of GS plate of 8 mm thickness. The anchor plate should have at its centre 20 mm dia hole Turn Buckle & Eye Bolt with 2 Nuts To be made of 18 mm dia GS Rod having an overall length of 450mm, one end of the rod to be threaded up to 300 mm length with a pitch of 5 threads per cm and provided with two GS Hexagonal nuts of suitable size conforming tois:1363:1967 & IS:1367:1967. The other end of rod shall be rounded into a circular eye of 40mm inner dia with proper and good quality welding Bow with Welded Channel To be made out of 18 mm dia GS rod. The finished bow shall have an over all length of 995 mm and eight of 450 mm, the apex or top of the bow shall be bent at an angle of 10 R. The other end shall be welded with proper and good quality welding to a GS angle 200 mm long having a dimension of 100x50x4.7mm. The channel shall have 2 holes of 18 mm dia and 20 mm dia hole at its centre as per drawing enclosed Thimble To be made on 1.5 mm thick GS sheet into a size of 75x22x40mm and shape as per standard shall be supplied. 3. Galvanizing The complete assembly shall be hot dip galvanized as per ISS. 4. Welding The minimum strength of welding provided on various components of 16mm and 18 mm dia stay set shall be 3100 kg & 4900 Kg respectively. Minimum 6mm filet weld or its equivalent weld area should be deposited in all positions of the job i.e. at any point of the weld length. The welding shall be conforming to relevant IS:823/1964 or its latest amendment. 5. Threading The threads on the Anchor Rods, Eye Bolts and Nuts shall be as per specification IS; 4218:1967 (ISO Metric Screw Threads). The Nuts shall be conforming to the requirements of IS: 1367:1967 and have dimension as per IS 1363:1967. The mechanical property requirement of fasteners shall confirm to the properly clause 4.6 each for anchor rods and Eye bolt and property clause 4 for nuts as per IS:1367 : TESTS The contractor shall be required to conduct testing of materials at Govt./ Recognized testing laboratory during pre-dispatch inspection for Tensile Load of 3100 Kg / 4900 Kg applied for one minute on the welding and maintained for one minute for 16 mm and 18 mm dia stay sets respectively. 7. IDENTIFICATION MARK All stay sets should carry the identification mark of the Purchaser NESCO, RGGVY as applicable. This should be engraved on the body of stay rods to ensure proper identification of the materials. The nuts should be of a size compatible with threaded portion of rods and there should be not play or slippage of nuts.

14 Welding wherever required should be perfect and should not give way after erection. 8. TOLERANCES The tolerances for various components of the stay sets are indicated below subject to the condition that the average weight of finished stay sets of 16mm dia excluding nuts, thimbles and washers shall not be less than the weight specified above:- GURANTEED TECHNICAL PARTICULARS OF LT /HT STAY SETS Sl No. Item Description Specified Parameters Section Tolerances Fabrication Tolerances Material Type of Stay Sets Bidder s offer 1. Anchor Plate 2. Anchor Rod 3. Turn Buckle Bow 4. Eye Bolt Rod 6mm thick +2.5%-5% 8 mm thick +2.5%-5% 16mm dia +5%- 3% 18 mm dia +5%- 3% 16mm dia +5%-3% 18mm dia +5%-3% 16mm dia +5%-3% 18 mm dia +5%-3% 200x200mm+1% GS Plate 6 mm thick 300x300mm+1% GS Plate 8 mm thick Length 1800mm + 0.5% Rounded Eye 40 mm inside dia +3% Threading 40mm+ 11%-5% GS Round 16mm dia GS Round 16mm dia Length 1800mm + GS Round 0.5% 18mm dia Rounded Eye 40 GS Round mm inside dia +3% 18mm dia Threading 40mm+ 11%-5% 995mm+1% GS Round 16mm dia. Length180mm +1% GS Angle 50x50x6 mm 995mm+1% GS Round 18mm dia. Length200mm +1% GS Channel 100x50x4.7mm Length 450mm + 1% Threading 300mm +1% Round Eye 40mm inside dia+3% Length 450mm + 1% Threading 300mm +1% Round Eye 40mm inside dia+3% GS Round 16 mm dia LT Stay Set HT Stay Set LT Stay Set HT Stay Set LT Stay Set HT Stay Set LT Stay Set GS Round 18 mm dia HT Stay Set

15 5 Galvanisatio n thickness a Anchor Plate b Anchor Rod c TurnBuckle Bow d Eye Bolt Rod All galvanization shall be carried out in accordance with IS: The weight of Zinc deposited shall be in accordance with IS: 2629 and shall not less than 0.61 kg/m² with a minimum thickness of 86 microns for items of thickness more than 5 mm, 0.46kg/m²(64 microns) for items of thickness between 2 mm & 5 mm& 0.33kg/m²(47 microns) for items less than 2 mm thickness. 6 Thimble 2 nos. to be made of 1.5 mm thick G.S Sheet into a size 75x22x40 mm & shape as per standard. 7 One G.S Hexagonal Nut confirming to IS:1363 & 1367 with one square washer of size 50x50x6 mm (G.S) along with Anchor Rod. 8 Two G.S Hexagonal Nuts of suitable size along with Eye Bolt Rod. Group-C: TECHNICAL SPECIFICATION OF 7/10 & 7/12 SWG GI STAY WIRE Application Standards Except when they conflict with the specific requirements of this specification, the G.I Stay Stranded Wires shall comply with the specific requirements of IS: IS: & IS: or the latest versions thereof. Application and Sizes a) The G.I. stranded wires covered in this Specification are intended for use on the overhead power line poles, distribution transformer structures etc. b) The G.I stranded wires shall be of 7/10SWG (7/3.15 mm for 11KV lines and 7/12 SWG 7/2.5 mm for LT lines standard sizes. Materials The wires shall be drawn from steel made by the open hearth basic oxygen or electric furnace process and of such quality that when drawn to the size of wire specified and coated with zinc, the finished strand and the individual wires shall be of uniform quality and have the properties and characteristics as specified in this specification. The wires shall not contain sulphur and phosphorus exceeding 0.060% each. Tensile Grade The wires shall be of tensile grade 4, having minimum tensile strength of700 N/mm² conforming to 1S:2141. General Requirements (a) The outer wire of strands shall have a right-hand lay. (b) The lay length of wire strands shall be 12 to 18 times the strand diameter. Minimum Breaking Load The minimum breaking load of the wires before and after stranding shall be as follows: No. of Wires & Const. Wire Dia (mm) Min. breaking load of the Single wire before stranding (KN) Min. breaking load of the standard wire (KN) 7 (6/1) (6/1) (6/1) Construction (a) The galvanized stay wire shall be of 7-wire construction. The wires shall be so stranded together that when an evenly distributed pull is applied at the ends of completed strand, each wire shall take an equal share of the pull.

16 (b) Joints are permitted in the individual wires during stranding but such joints shall not be less than 15 metres apart in the finished strands. (c) The wire shall be circular and free from scale, irregularities, imperfection, flaws, splits and other defects. Tolerances A tolerance of (+) 2.5% on the diameter of wires before stranding shall be permitted. Sampling Criteria The sampling criteria shall be in accordance with IS: Tests on Wires before Manufacture The wires shall be subjected to the following tests in accordance with IS: (a) Ductility Test (b) Tolerance on Wire Diameter Tests on Completed Strand The completed strand shall be tested for the following tests in accordance with IS: (a)tensile and Elongation Test: The percentage elongation of the stranded wire shall not be less than 6%. (b)chemical analysis (c)galvanizing Test The Zinc Coating shall conform to "Heavy Coating" as laid down in 1S:4826 Marking Each coil shall carry a metallic tag, securely attached to the inner part of the coil bearing the following information: (a) Manufacturers name or trade mark (b) Lot number and coil number (c) Size Construction (d) Tensile (e) Designation (f) Lay (g) Coating (h) Length (i) Mass (j) ISI certification mark, if any Packing The wires shall be supplied in Kg. coils. The packing should be done in accordance with the provisions of IS:6594. Other Items: For remaining items of stay sets mentioned in the enclosed drawing, relevant applicable Indian standards shall be applicable. Group-C: EARTHING COIL SCOPE : TECHNICAL SPECIFICATION OF EARHTING COIL The specification covers design, manufacture, testing and dispatch to the owner s stores of Earthing Coils for use in earthing of the HT & LT poles. GENERAL REQUIREMENTS: Earthing coils shall be fabricated from soft GI Wire Hot Dip Galvanized. The Hot Dip galvanized wire shall have clean surface and shall be free from paint enamel or any other poor conducting material. The coil shall be made as per REC constructions standard.

17 The Hot Dip galvanizing shall conform to IS: 2629/1966, 2633/1972 and 4826/1969 with latest amendments. TESTS: Galvanizing Tests Minimum Mass of Zinc On GI Wire used 280 cm/m² After Coiling-266 gm/m².the certificate from recognized laboratory shall be submitted towards mass of zinc. Dip Test Dip test shall stand 3 dips of 1 minute and one dip of ½ minute before coiling and 4 dips of 1 minute after coiling as per IS: 4826/1979 Adhesion Test As per ISS DIMENSIONAL REQUIREMENT i) Nominal dia of GI Wire -4 mm (Tolerance±2.5%) ii) iii) iv) Minimum no. of turns 115 Nos. External dia of Coil (Min) 50 mm Length of Coil (Min) 460 mm v) Free length of GI Wire at one end coil (Min.) 2500 mm vi) The turns should be closely bound. Weight of one finished Earthing Coils (min.) Kg. Guaranteed Technical Particulars of Coil Earth Sl. GENERAL TECHNICAL No. PARTICULARS 1 Nominal diameter of wire 2 No. of turns 3 External dia of Coil 4 Length of Coil 5 Mass of Zinc 6 Total weight of Coil 7 Whether drawing enclosed (yes) Bidder s Offer

18 Group-C: Danger Board TECHNICAL SPECIFICATION OF DANGER NOTICE PLATE: The danger plate shall be affixed in a permanent manner on operating side of the panel, Substations, Distribution Boards, Electric poles etc.. The danger notice plate shall indicate danger notice both in English and Odiya, English & Hindi and with a sign of skull and bones. The letter, the figure, the conventional skull and bones shall etc. shall be positioned on the plate as per recommendations of IS : The said letter, the figure and the sign of skull and bones be painted in single red colour as per IS : Standards of Danger Plate: The Danger Notice Plates shall comply with IS: or the latest amendment. The following tests shall be carried out on Danger Plate: I) Visual examination as per IS: II) Dimensional check as per IS: III) Test for weather proofness as per IS: (or its latest version) Group-E 11 KV 200 Amp 3 Pole AB Switch Technical Specification 01.0 Scope: - This specification covers manufacturing testing and supply of 11KV 200 Amps 50HZ Air Break switches for outdoor installation in horizontal configuration. The switches are suitable for operation under off load conditions only and are intended for use on Distribution Sub stations and tapping sectionalizing points of 11 KV lines Description of the materials: - The 11KV A.B. Switch sets shall confirm to the following parameters: - a. Number of poles 3 b. Number of Post insulator per pole 2nos12KVpostinsulator. c. Nominal system voltage 11KV d. Highest system voltage 12KV e. Rated frequency 50Hz f. System earthling effectively earthed. g. Rated nominal current 200 amps h. Altitude of installation Not exceeding1000m The post insulators used in the A.B. Switches shall have the following ratings :- a. Power frequency withstand voltage (dry) 35KV (RMS) b. Power frequency withstand voltage(wet) 35KV (RMS) c. Implies withstand voltage(dry) 75KV d. Power frequency puncture withstand 1.3

19 03.0 Standards: - The AB Switch Set shall conform to the following standards: - a. IS-9920 (Part-I to V) b. IS-2544/1973 (for porcelain post insulators) c. IS-2633, (for galvanization of ferrous parts.) or its latest amendments if any Insulator make: - 12KV post insulators complete with post and cap duly cemented to be used in the AB Switch Set conforming to IS-2544/1973. The bidder shall furnish the type test certificate of the post insulators from their manufacturer for reference and scrutiny. The bidder shall mention make, type of insulation materials, metal fittings, Creepage distance, protected Creepage distance, tensile Strength, compressing strength, torsion strength and cantilever strength Climatic condition: - The A.B. Switch set shall be suitable for operation under the following climatic conditions. a. Maximum ambient air temperature 45 o C b. Maximum daily average air temperature 35 o C c. Maximum yearly average ambient air temperature 30 o C d. Maximum temperature attainably by a body e. Exposed to the Sum. 50 o C f. Minimum ambient air temperature 0 o C g. Maximum relative humidity 100% h. Minimum number of rainy days per annum 70 i. Average number of rainy days per annum 120 j. Average annual rain fall 150cm. k. Number of months of tropical monsoon conditions 4 l. Maximum wind pressure 260Kg./mm2 m. Degree of exposure to atmospheric pollution normally n. Atmosphere. Polluted Other technical details: General: - The 11KV A.B. Switch Set shall be the gang operated rotating single air break type having 2 post insulators per phase. The operating mechanism shall be suitable for manual operation from the ground level and shall be so designed that all the three phases shall open or close simultaneously. The Switches shall be robust in construction, easy in operation and shall be protected against over travel or staining that might adversely affect any of its parts. The required base M.S. Channel (hot dip galvanized) phase coupling rod, operation rod with intermediate guide braided with flexible electrolytic copper, tail piece of required current carrying capacity and operation mechanism with ON & OFF positions shall be provided. The operation rod shall be medium gage of 32mm diameter nominal bore G.I. pipe single length 6 meters. The phase coupling rod for gang operation shall be of medium gauge 25mm dia &2100 mm length nominal bore G.I. pipe. The Rating post insulators shall be provide with suitable bearing mounted on a base channel with 8mm dia thrust collar and 6mm split pin made out of stainless steel. The operating down rod shall be coupled to the spindle (minimum dia 32mm) for gang operation through another suitable bearing by two numbers 10mm dia stainless steel bolts with double nuts. All the bearings shall be provided with grease nipple. All metal (ferrous) parts shall be galvanized an polished. The pipe shall be galvanized in accordance with IS-4736/1968.The post insulators should be fixed with the base channel using Galvanized Nuts and Bolts Mounting:- The A.B. Switches shall be suitable for horizontal mounting in double pole sub-station structures. MS Galvanized base Channel & base support channel should be of min. size 75x40x6 mm.

20 Switching Blades: - It shall be made out of electricity copper with silver plated. The approximate size shall be 220mm X 35X 6mm. The Switch shall have such a spring mechanism so as to ensure that the speed of the opening of contact is independent of speed of manual operation Fixed Contacts: - The Fixed Jaw type female contacts o f s ize (70x35x6) mm shall be made of electrolytic copper (minimum 95% copper composition) duly silver coated controlled by phosphorous bronze high pressure spring housed in robust G.I. Cover. It is essential that provision shall be made in fixed female contracts to take the shock arising from the closing of move contract blade without the same being transmitted to the post insulator. The arrangement made in this regard shall be specifically shown in the drawing Arcing Horn: - As the switches are generally meant for isolating transmission line and distribution transformers, suitable arcing horns shall be provided for breaking the charging current horn shall be made of 8 mm dia G.I. Rod with spring assisted operation Terminal Connectors: - Terminal connectors shall be robust in design. The size of fixed connector shall be (65 X 35 X 6 mm) and size of movable connector shall be of (65 X 35) X (65 X 35) X 6mm of copper casting with uniform machine finishing duly silver plated made out of minimum 95% copper composition with 2 nos. 12mm dia holes provided with suitable brass bolts and double nuts, flat washers & 2nos. bimetallic solder less sockets suitable up to 55 mm 2 conductor Spacing: - The minimum clearance between phases to the switch shall be 760mm. The operation down rod shall be at a transverse distance of 300mm from the outer limb of the switch. The centre spacing between two post insulators of the same phase shall be 380 mm. In the open position of the A.B. switches the moving blade shall rotate through 90 o. This shall be exhibited in the drawing Sample, Drawing & Literatures: - Three copies of drawings of 11KV 200 Amps. A.B. Switch shall be furnished along with the tender. Technically successful bidder is to be asked for submission of Sample for verification The details of construction and materials of different parts of the A.B. Switch shall clearly be indicate in the tender and illustrative pamphlet / literature for the same shall be submitted along with the tender TEST & TEST CERTIFICATE: Type Test: - Certificate for the following type tests conducted on a prototype set of A.B. Switch in a NABL approved test house/cpri shall have to be submitted along with offer. Dielectric Test (impulse and one minute were power frequency withstand voltage test.) Temperature rise test (for contracts and terminals) Shorts Time current and peak withstand current test. Mainly active load breaking capacity test. Transformer off-load breaking capacity test. Line charging breaking capacity test. Cable charging breaking test. Operation and mechanical endurance test. Mechanical strength test for post insulator, as per IS-2444/1937 shall be furnished. Test for galvanization of metal (ferrous) parts Routine /Acceptance Test: - The inspection may be carried out by the Purchaser at any stage of manufacture. The successful bidder shall grant free access to the Purchaser s representative at a reasonable time when the work is in progress. The following routine tests shall have to be conducted on each set and results are to be furnished for consideration of deputing inspecting officer for inspection and conduction testing of the materials at the works of the manufacturer. the supplier shall give fifteen days advance intimation to the Purchaser to enable him to depute his representative for witnessing the tests. 1. Power frequency voltage dry test.

21 2. Measurement of resistance of main circuit. 3. Tests to prove satisfactory operation. 4. Dimension Check 5. Galvanization test. 6. Operational test Guaranteed Technical Particulars: - The bidder shall furnish the guaranteed technical particular duly filled in the format along with the tender Completeness of Equipment: - All fittings, accessories of apparatus which may not have been specifically mentioned in this specification but which are usual or necessary in equipment of similar plat shall be deemed to be included in the specification and shall be supplied by the Tender without extra charge. All plant and equipment shall be completed in all details whether such details are mentioned in the specification or not. Guaranteed Technical Particulars Sl. No Particulars Requirement Bidders offer 1 Maker s name & Address To be specified by the bidder 2 Type of Switch Rotating Type 3 Suitable for mounting Horizontal only 4 No. of Breakers per phase Single Break 5 No. of Post Insulators per phase 6 Post Insulators (a) Maker s Name & Country of Manufacture of 2nos. of 12KV Post Insulators as per IS:2544/73 per phase To be specified by the bidder as per CPRI Test Report Post Insulator (b) Type of cementing Original Cementing. The insulator to be cemented with MCI (Hot dip galvanised /Al Alloy cap and MCI/Forged steel hot deep galvanized pedestral) as per IS: 2544/1973 (c) Power frequency withstand voltage (Dry) 35 KV RMS (d) One minute Power 35 KV RMS frequency withstand voltage (wet) (e) Visible discharge voltage 9KV RMS (f) Dry flash over voltage 85 KV (g) Power frequency puncture withstand voltage 1.3 times of actual dry flash over voltage (h) Creapage distance 320 mm minimum (ISS-2544/1973 & relevant IEC) (7) Impulse withstand voltage for positive & negative polarity (1.2/50 micro second wave)

22 (a) Across the isolating distance 85KV Peak (b) To earth & between poles 75KV Peak 8 Rated one minute Power frequency withstand voltage (a) Across the Isolating 32KV(RMS) distance (b) To earth & between poles 28KV(RMS) 9(a) Rated voltage nominal/ maximum (b) Rated normal current and rated frequency 10 Rated short-circuit making capacity 11/12KV 200 Amps. 50hz 25KA (Peak) 11 Rated Short-time current 10KA 12 Rated peak withstand current 40KA 13 Rated mainly active load breaking capacity 14 Rated Transformer off load breaking capacity 15 Rated line charging breaking capacity 200 Amp.(RMS) 6.3 Amp.(RMS) 2.5 Amp(RMS) 16 Minimum clearance between adjacent phase (a) Switch closed (center to center) (b) Switch opened (Center of post insulator to the edge of the blade) 17 Temperature rise The Temperature rise should not exceed the maximum limit to 65 o C at an ambient temperature not exceeding 40 o C Copper contacts silver faced terminal of switch intended to be conducted to external conductor by bolts or screws at an ambient temperature should not exceed. 18 Vertical clearance from top of insulator cap to mounting channel. 760mm 380mm 65 0 C 50 o C 254 mm

23 19 Type of contact a) Self aligned high pressure jaw type fixed contacts of electrolytic copper of size 70 mm x 35mm x 6 mm duly silver plated.each contact should be riveted with three nos. copper rivets with a bunch ( minimum 3 mm thick) of copper strips /foil each may vary from 0.15 mm to 0.25 mm to and total thickness of copper foil per jaw should be 6 mm. Jaw assembles are to be bolted through brass bolts and nuts with spring washer. b) Solid rectangular blade type moving contact of electrolytic copper of size 35 mm X 6 mm and length 220 mm duly silver plated ensuring a minimum deposit of silver 10 micron on copper contacts or as may be prescribed under relevant ISS / IEC. c) Pressure springs are to be used in each jaw contacts should be phosphorous bronze having 8nos. of turns X28mm heights X14.4mm diameter with 14 SWG wire. 17 Connectors:- Terminal connectors for both movable and fixed should be of copper flat of same size similar to that of moving contact blades (minimum 95% copper composition). The fixed connector shall of size 65 mm x 35 mm x 6 mm and the size of movable connector shall be size (65 X 35) X (65 X 35) X 6mm with machine finishing duly silver plated with 2 nos. 12mm dia holes provided with suitable brass bolts and double nuts, flat washers & 2nos. bimetallic solder less sockets suitable upto 55 mm² conductor. 18 Moving contact supporting angle 19 Galvanization Moving contact is to be supported by G.I angle of size 45x45x5 mm on each phase and the moving contact are to be bolted through 2 nos. stainless steel bolts and nuts with suitable stainless steel flat and spring washers. a) Iron parts shall be hot dip galvanized as per IS- 2633/1972.(Latest Amendment), IS :2629/1985 (1 st. Revision),