Military Engineer Services-MES has published Tender For Provision Of 40 Kw ( 2 X 20 Kw ) Solar Power Plant , Provision Of External Electric And Water Supply Connection In Bldg No P-3 & P-4 , Provision Of Fresh Water Pipeline Of Otm Bldg No Ds-25 To Ds-30 & Provn Of 5 X 9 M Mini Mast Light With 4. Submission Date for this Tender is 25-11-2023. Halogen Light Tenders in secunderabad Telangana. Bidders can get complete Tender details and download the document.
| Sr No | CorrigendumDate | Corrignedum | CorrigendumType | NewSubmissionDate |
| 1 | 18-Nov-2023 | Bid Auto Extn Corrigendum | Bid Auto Extn Corrigendum | 25-11-2023 |
| Sl. No. | Item Description |
| 1 | Design, procure, erection, installation, testing and commissioning including connecting to local utility grid; Roof top On-grid Solar Photovoltaic Plant of 20 kW capacity including Solar Photovoltaic Modules, DC Cabling, Module Mounting Structures, Array Combining Boxes, Lightning Protection of SPV modules and other accessories, Central Inverter as Power Conditioning Unit, Weather Station and Data Monitoring System all as per detailed specifications given in Particular Specification, latest MNRE/IREDA guidelines and directions, meeting the Domestic Content Requirement (DCR), consisting of all requisite accessories (BOS-Balance of System) and incuding the following main componenets:- Make : Monocrystalline PV Modules & PV Cells : TATA/ Adani/ HHV/ Emmvee/ BHEL/ Premier Energies/waaree/havells/Renewsys Solar Inverter/ Power Conditioning Unit (PCU) : Schnider/ABB/ Siemens /Havells/Polycab / Power one / Growatt (A) Mono Crystaline Silicon Solar Photovolaic Modules of400 Wp or more (module power and number of modules to be selected according to available roof top area & adequate walkway), having cell efficiency more than18% under standard conditions, form fill factor more than 0.76, plant performance ratio > 75%, made of high transmitivity glass front surface and it shall give high encapsulation gain (transmittance above 90% and bending less than 0.3%). The modules shall have the folling features :- (a)The electrical parameters of SPV modules under standard test condition of irradiance 1000 W/sqm, AM 1.5 Spectrum and temp 25 degree Celsius shall be as under:- (i) Max Peak Power Pmax : 400Wp or more (ii)Voltage at Max Power : > 39 V (iii) Current at Pmax : > 9 A (iv) Short Circuit Current : > 10 A (v)Open Circuit Voltage : > 47 V (vi) Module Efficiency : > 19 % (b) Rated output of the modules shall have positive tolerance of 3-5% and no negative tolerance is allowed. (c) It shall perform satisfactorily in RH 85% with temperature up to +85 degree C and should withstand wind of 200 kmph on the surface of panel. (d) PV modules shall be warrented for their output peak watt capacity, and it shall not fall of its initial value below 90% in first 10 year end and 80% after the end of 25 years. |
| 2 | Sl Item 1.00 Contd…. (e) Each module shall have RFID tag encapsulated with solar cell bearing following details :- (i)Name of Manufacturer of SPV Module (ii) Name of Manufacturer of Solar Cell (iii)Month and year of Manufacturing (seperately for cell and module) (iv) Country of Origin (both cell and module) (v)Peak wattage, Im, Vm and fill factor of the module (vi) Date of year of obtaining IEC PV module qualification certificate including the test lab issuing IEC certificate. (vii)Unique serial no and model no of module (viii)IV curve of module (f)The temperature coefficient of power for the module shall not be more than 0.50% per degree Celcius. (g) Every module must have bypass diode of suitable capacity. (h) PV module must confirm to latest edition of IEC 61215/ IS 14286. In addition the modules must confirm to IEC 61730 Part I and II for construction and testing & safety qualifications and confirming to IEC 62804 PID. (j) It shall also be in confirmity to latest minimum technical specification issued by MNRE & IREDA from time to time. Modulesshould be of MNRE & IREDA approved companies and as per latest IEC/IS standards. (k)Provision of earthingand earth strip / cable etc for earth of solar PV module/ array etc as per latest IS/MNRE & IREDA norms to be provided and cost of the same is deemed to be included in the item and no extra amount will be paid to the contractor on this account. (The earthing shall be of copper earth plate and having specification as per SSR Item Sr 19474). (l)RFID reader is to be provided by contractor (m)Both PV cells and SPV modules shall be make in India. (n) The minimum Net Annual Generation shall be 1,460 units per Kilo Watts. |
| 3 | (B)Junction Boxes : Supply and fix jucntion boxes of suitable Nos (as per design)/ OEM recommendations inputs and suitably rated output having separate DC fuses for both (+) & (-) on input and isolator on output terminal for each string. Each junction box must have a spare input terminal. The junction boxes shall be dust and vermin proof and water proof made of FRP/ Thermo Plast with IP 65 protection in compliance with IEC 62208 and shall be UV resistant, fire retardant. It shall have surge protection and maintenance free earthing as per relecant standard. The junction box shall have suitable arrangement of the following :- (a)The strings are required to be connected to the copper bus bar through individual fuses. (b) Provide arrangement for disconnection (DC dis-connection switch) for each SJB/ SCB. (c)Provide a test point for each sub group for quick fault location and to provide group array isolation. (d)Each array box shall be of relevant IEC standard. (e) Each array junction box shall have suitable bypass & reverse blocking diodes for maximum DC blocking voltage of 1000V with suitable arrangement of its connection. Reverse blocking and bypass diodes shall work for extreme temperaturesand shall have efficiency of 99.98% confirmed by appropriate IEC standard. Make : As per OEM (C)DC Cables : Suitable size of XLPE insulated tinned Copper cable of suitable size of Solar grade, 1100 Volts and UV resistant for outdoor installations confirming to IEC : 60227/15694 & 60502/ IS : 1554 (Pt I&II) and shall be as under :- (a) All cables and connectors for use of installation shall be of Solar grade which can withstand harsh enviromnetal conditions including high temperature, UV radiations, rain, dirt, burial and attack by moss and microbes for 25 years and voltage as per latest IEC/ IS. (b) All the cables / wires shall be provided with UV resistant printed ferrules for DC side. (c) The size of the cable shall be such that avearage voltage drop at full power from PV module to inverter shall be less than 1.5%. (d)Cable batch No, drum No, IS code and size and make shall be metioned on every one meter or as per OEM practice. (e) The wiring of the module interconnection shall be in UPVC/HDPE pipe of suitable size. (f) The cost of interconnecting DC Copper cable, MS cable trays, and earth work for trenches/ MS cable trays suitable to accommodate Solar grade cables from SPV module upto inverters are included in the item. |
| 4 | Sl Item 1.00 Contd…. (D)Module Mounting Structure (MMS) : Design, procure, fixing, support structure made of hot dipped galvanised with min 85 micron thickness including necessary PCC foundation and associated work (cutting, grouting, PCC filling, dispoing waste material, etc., complete) and fixing mounting arrangement suitable for SPV modules so as it can withstand wind speed of 200 km per hour. The mounting structure is to be installed at RCC Roofs and the array structure has to be so designed that maximum load is directly on roof beams and columns. It shall also occupy minimum space without sacrificing the output of SPV panels & adequate space between the arrays shall be available for easy cleaning and maintenance. Nuts, bolts, mounting structure including module mounting structure shall have to be adequately protected from the atmosphere and weather prevailing in the area. All the fastners shall be of Stainless Steel of grade SS316. Notes : (a) Two numbers of anti theft fastners of Stainless Steel on two diagonally opposite corners of each module shall be provided. (b) The modue mounting structure shall be of fixed to provide maximum generation. (c) MMS design shall be supported with Stadpro Report vetted by Third Party (Gov Institute) and submitted for the approval of the Acepting Officer. (d) The height of Roof top MMS shall be as per latest MNRE & IREDA guidelines. |
| 5 | Sl Item 1.00 Contd…. Output AC (j) Output Frequency : 50 Hz± 3Hz (k)Power factor : > 0.995 (l) Harmonic Distortion Current : < 3% (m) Efficiency : > 98% (n)Standby operation consumption : < 1.5 W (p)Operating temperature upto 85 degree centigrade (q)The inverter shall have minimum IP-67 protection, ground fault monitoring, grid monitoring, protection for anti-islanding, DC reverse polarity, AC and DC short circuit current and over current, AC and DC over voltage and over temperature. (r) The inverter shall adjust voltage and frequency levels to suit the grid. (s)The inverter shall be self commulated with Pulse Width Modulation (PWM) technology and shall be capable of synchronise maximum with in one min. (t) Maximum Power Point Tracker (MPPT) confirming to IEC 62093 shall be integrated in the inverter to maximise the energy drawn from the PV array (u)Monolithic design of inverter is not permitted. (v)The inverter shall have suitble nos of protected inputs (asper design) and outgoing shall be protected by ACB/MCCB. |
| 6 | Sl Item 1.00 Contd…. (x)The inverter should have MODBUS, PROFIBUS, ETHERNET common ports. (y) The inverter shall include appropriate self protection and self diagnostic feature to protect itself and the PV array from the damage in the event of inverter componant failure or from parameters beyond the inverters safe operating due to internal and/ or external causes. Inverter shall have protection arrangement against ground leakage faults, over voltage, (SPD) & over current. Inverter shall have arrangement for adjustment for adjusting DC input current and shall trip against sustainable fault down stream and shall not restart till fault is rectified. (z)The inverter should have provisions of Galvanic isolation, anti-islanding protection (IEEE 1547/UL 1741) equivant IS and lightening. (aa) PCU must have the feature to work in tandem with other similar PCUs and be able to be successively switched ON and OFF automatically based on solar radiation variations during the day. (G) DG PV SYNCHRONIZATION (ZERO EXPORT ON DG) : Back Feed Protection Controller Hardware enclosed in a Fully Engineered IP 54, Powder Coated Panel with all accessories :- (a)Back Feed Protection Controller Run Time Software customized to configuration,Feedback Management of solar power. (b)Data Logging Facility with 1 Year Cloud Charges included, (c ) Two Level Protection (d) Level-1 ( Primary Protection) : Controller (e) Level-2 : Communication failure (f)CT / PT - Supply or fitting in any of the Panels (g) Modification in Wiring of any existing panels (h) Cabling for powering back feed protection control panel (j) SEB Main Line/ ACDB Energy Meter of any kind. (H) Balance of System (BOS) Items/ Components :- The BOS items/components of the SPV power plants/ systems deployed under this project shall conform to the latest edition with certificate of IEC or equivalent BIS Standards/ MNRE specifications/ as specified in Para 1.01 of "Minimal Technical Requirements"/ "Standards for SPV System/ Plants" to be deployed during this financial year under the programmes of MNRE available on MNRE website as on last date of quoting of tender.Notes : (a)Solar plant to be installed at the Roof of the Bldg .The contractor must visit the site before quoting the rates for this item to asses the site condition so as to decide up on location and layout of SPV, placement of inverter, length of DC cables, lightning arresters, etc., complete. |
| 7 | Sl Item 1.00 Contd…(G) DG PV SYNCHRONIZATION (Contd...) (b) The contractor shall submit complete scheme including electrical diagram of the work, schematic diagram, SPV module layout, placement of LAs, Civil work,etc., complete as per IREDA latest guidelines as applicable, Relevant IEC/IS norms to the GE for approval with in one month of date of commencement of the work. (d) The rate quoted shall inclusive of the all protection system including surge, lightning arresters and necessary earthing all as specified and directed (e)Training : On successful commissioning of the plant, training shall be provided on plant operation and maintenance to a team (Engineers and technicians/ operators) as nominated by department for minimum one month. (f) For every array 2 Nos of nozzle along with water pipe line connection from 500 Ltrs make up water tank to be provided. Tapping to existing pressure line for supply of water tank tobe provided to water tank at staging height of 3 mtr. The rate quoted shall be inclusive of nozzle, required pipe line connections and make up water tank |
| 8 | Supply and lay in fixed to walls, roof ,etc by using shaddlesand CONNECTING / TERMINATION BY USING LUGS of appropriate size XLPE insulated and PVC sheathed heavy duty LT 1100 Volts grade armoured under ground cable with aluminium conductor of4 Core 16 Sqmm inclall as directed. Make : Havells/Finolex/polycab/KEI/Gloster Note : Rate quoted by the contractor inclusive of Shaddles, screw, making hole on wall including making good of disturbed surfaceetc as required for fixing of cable in wall, roof etc |
| 9 | Supplying, erecting and fixing steel tubular swaged poles with cast iron base plate of size 300mm x 300mm x 6mm, finial taper plug, bolts, nuts & screws for type 410 SP-31 (9.0 mtrs long)including painting with two coats of aluminium paint over one coat of red oxide primer on all exposed surfaces and tarring with black bituminous paints to embedded portion in PCC and providing 3 Nos of 30cm wide circular bands with black & yellowpaint starting from plinth level at a gap of 30 cm in between 2 bands and numbering of poles, in yellow paint over black painted back ground at a height of 2m from bottom of pole with 5 cm large bold letters 2" (inch) wide including taking down old unserviceable PCC poles of any type complete all as specified and directed. Note: Excavation, earth work, PCC in foundation and coping shall be measured and paid separately under relevant item of this schedule. |
| 10 | Supply, fixing, connecting and testing LED Flood lights of 150 watts capacity lighting with high power LED and unique peanut lens to ensure uniform distribution,including nut, botls, washer, clamps etccomplete all as specified and directed by the Engr-in-charge.Make : Cromptron, Philips ,Bajaj, Surya or equivalent |
| 11 | S & F hot press moulded SMC junction / terminal box of size with internal diamensions of 200 x 140 x 95 mm with hinged door, incl provision of 2 way connector415 Volts made out of polycarbonate or bakelite and 1 No MCB of 6 Amps with DIN bar, drilling holes for cable connections, connecting incoming and or out going cables by providing suitable of size of cable lugs/glands, fixied on pole by means of clamps made out of MS flat iron of size 25 mm x 3 mm including dismantling of old unserviceable all as specified and as directed.Make: Hensel/Syntex/C&S/nyptune |
| 12 | Excavation in trenches not exc 1.5 mtr wide and not exc 1.5 mtr in depth; for trench of cable etc and getting out in harddense soil complete all as specified and as directed. |
| 13 | Returning, filling in, including spreading, leveling, watering and well ramming in layers not exc 25 cm in Soft/loose soil complete all as specified and as directed |
| 14 | Removing excavated material to a distance n.exc 50 mtr and depositing where directed at level n.exc 1.5 mtr above the starting point all as specified and as directed |
| 15 | Spreadingriddled earth ( after preparation of excavated earth)in Cable duct forcushioning of cable laid in trenches complete all as directed by Engineer-in-ChargeNote:- Punned thickness 18 CM( 6.25 Cm below cale and 11.75 cm above cale)will be measured for payment purpose. The earth removed during excavation to be used as rddled earth after crushing and sieving. Quoted rate inclusive of all arrangement as mentioned. |
| 16 | Material and labour for XLPE insulated GI wire/strip armoured electric powercable (Heavy duty) ISI marked with stranded aluminium conductor 1100 volts grade, cross sectional area 10 Sqmm 4 core laid in trench /poles/on wall all as specified and as directedMake:Havells/KEI/Plaza |
| 17 | M & L for brick protection cover of old size bricks common burnt clay building bricks sub class ’B’ laid dry and flat abutting each other with width equal to length of brick and gap between adjacent bricks not exceeding 10 mm complete all as specified. |
| 18 | M&L cross arm bracing supports, clamp and back plate from structural steel section including nuts & bolts washer, welding, bending, cold or hot drilling holes for bolts in any shape or size as indicated or as directed and including of one coat primer, one under coat and one finishing coat of aluminium paint for making clamp to be used for fixing of flood light /street light on pole.. |
| 19 | Supply and fixing lantren of dia 60 CMfor fixing of flood light,cap type to be fixed on the top of 9 m SP-31 Steel pole , made of MS pip medium gradedia greater than the top dia of the pole of length 0.35 M supported by MS flat iron of size 50X6 mm 8 nosincluding two coat of aliminium painting over a coat of redoxide primer complete all as directed |
| 20 | Excavating in Trenches, not exc. 1.50 metre wide and exc. 1.50 metrebut not exc. 3.00 metre in depth, for Foundation of Poles, etc. and getting out in Soft/ Loose Soil, complete all as specified and as directed. |
| 21 | Supply and lay PVC Insulated , PVCsheathed industrial HV round multicore flexible cablewithcopper conductorthree core 2.5 sqmm including PVC conduit 20mm dia medium grade and necessary bends, fittings and fixturesas required for connection of light fittings . |
| 22 | Cement Concrete 1:2:4 TYPE B2 (40mm Graded Stone Aggregate) as Lean Concrete in Foundation of Poles, Stay Assembly, etc., including FormworkAND FOR FOUNDATION OF GI PIPE , BOLLARD LIGHT (as/if required), complete all as specified and as directed. |
| 23 | Cement Concrete 1:3:6 Type C1 (40mm Graded Stone Aggregate) as in Coping of Poles, etc. including Formwork (as/if required), complete all as specified and as directed. |
| 24 | Supply and fixing of automatic street light switch using infrared sensor based nature switch for automatic switching of street lights.Nature switch operation should bebased on natural light lux level. Required illuminance level for switching on is < 30 Lux and for switching off >10 lux. The sensor should also have part night operation facility of min 4 hrs to max 12 hrs.The sensor along with suitable power contactors incoming outgoing MCBS SP andand automanual (sensor bypass selection option should be enclosed in a pole /wall mountable enclosure made of rust proof electric shock proof termite proof and FR grade SMC Box conforming to IP54 three phase load of 12 KW with Circuit wiringmin 25 sq mm 3 nos contactor each of 20-25 amps incoming outgoing MCB (3 nos) rating 20-25 amps Model no Swadeep-02 EC 8KW 1P or equivalent . |
| 25 | Supply and lay GI tubing , 40 mm bore light grade for cable protection at road crossing / on poles and tubing sealed at both ends after laying the cables complete all as directed by Engineer-in-Charge.Make :-Tata/Jindal/surya |
| 26 | Supply and Lay Galvanised, medium grade, ISI Marked confirmingas per IS-1239 part - I galvanized, with all fittings such as bends, tees, elbows, reducers, unions, plugs, sockets etc., laid in trenches complete all as specified and as directed of following bores : - |
| 27 | 20 mm dia |
| 28 | 25 mm dia |
| 29 | 40 mm dia |
| 30 | 50 mm dia |
| 31 | Supply and fix in replacement of unserviceableGun metal, globe or gate valves, with iron wheel head, screwed both ends for iron pipes and fixed complete all as specified and directed for the following sizes:- |
| 32 | 20mm dia bore |
| 33 | 25mm dia bore |
| 34 | 40mm dia bore |
| 35 | 50mm dia bore |
| 36 | M&L for Cutting in existing CI water pipe line of 80 mm dia to requited length for insertion of CI Tee of size 80 mm X 80 mm X 50 mm in position and extending the branch connection complete all as specified and directed. |
| 37 | M&L for CI specials such as bends (any type radius, angle) taper any type (straight, Bend, increasing, decreasing or double socket etc). Tee pieces, angle branch, cross (all socket and spigot) collar, caps and Plugs for jointing upto 150 mm bore. |
| 38 | M&L for Run LeadJoints of 80 mm bore complete all as specified |
| 39 | Sypply and fixing in rereplacementof DI D/F Gate valve (Soft Sealed) Resilient Seated Soft Sealing gate valves( Sluice valves RAISING TYPE ) with body bonnet of ductile cast ironof grade GGG-40/SG- 400/15 or GGG-50/SG-500/7 or equivalent grade as per IS 3896 - Part 2- 1985 and subsequent revisions, Wedge fully rubber lined with EPDM Food grade quialityand Seals of NBR and the valve should be vacuum tight and 100 % leak proof with face to face dimention as per BS 5163-89/IS 14846-2000/DIN 3202 F 4. andValves should be electrostatic powder coating both inside and outside pocket less body passage class PN 1.6 including all jointing materials ( Gasket , Nutbolts ets)connecting and testing complete all as specified and directed. |
| 40 | 80 mm Dia |
| 41 | M&L for Construction of 230 mm thick PCC block masonary valve chamber built in CM 1:6 of size 900 x 900 mm (Internal size) x 600 mm deep with 100 mm thick foundation using PCC 1:4:8 type D2, 15mm thick internal plaster, 3 mm thick MS sheet cover, double door, 50 mm x 50 mm x 6mm MS angle frame fixed with hold fasts in PCC 1:2:4 type B1 coping 50 mm thick, 20mm x 6mm flat iron hinges with locking arrangement, MS handles and applying one coat of red oxide and two coats of synthetic enamel paint to all steel surfaces including excavation & earth work any type of soil /rock and disposal of surplus soil to a distance not exceeding 50 Mtr complete all as specified and directed |
| 42 | M & L cutting of road, hard standing made of concrete or premix carpet, WBM, soiling and morrum filling including excavation for laying of cable pipe all as directed and making good the road/hard standing by using all old/new materials and with PCC (1:2:4) etc, required to match with the existing surface complete all as specified and directed. |
| 43 | Advance Maintenance Free G.I. SAFE EARTHINGElectrodewith PIPEof not less than 50 mm outer dia( THICKNESS NOT LESS THAN -2.5MM) and two meterlength, The electrode should be ofgalvinised (80 -100 micron) along with earth lead as Galvanised steel strip of size 32 X6 mm7.5 m . The GI Electrode shall be pre-filled with Cristaline Conductive Material (CCM) . The GI electrode shall be surrounded with 25 kg BackFill compoundto provide maximum contact between the electrode and Back Fill Compound. Backfill compound should be eco-frendly and having RoHs certification .GI Electrode Shall be tested from CPRI.The earting pit should be cover with pcc(1:2:4 , B1) cover ,of300 x 300 mm complete all as specified and directed. Note : Rate inclusive of Earth works, removing of surplus soil . |
| 44 | Supply, installing, testing and commissioning, factory made and tested, LT panel board outdoor type, weather, vermin proof, cubical type, platform mounted, suitable for 415 volts, 3 phase 4 wire 50 Hz AC supply system all as specified and directed, with necessary bus bar arrangement with insulated bus bar 250 Amps rating , 4 strips, the panel should be dust proof, IP 54 class protection and made out of 3.15mm thick CRCA mild steel sheet with 50x50x6mm angle iron frame with necessary earth work excavation, hinged doors, front and rear opening and locking arrangement and duly powder coated on the out side and inside, cable glands and lugs for incomming and out going cable etc, independent chamber to accommodate incl plinth of panel of suitable size complete all as specified and directed including following accessories :- (a)Changeover, 160 Amp, 415 Volts-01 No( as Incoming) (b)Changeover, 63 Amp, 415 Volts-02 No( as Outgoing) (c)MCCB 4 pole adjustable,63 Amp, 415 Volts 25KA- - 02 Nos (d)Indicating lamps (set 03 Nos)- 01 set (R,Y & B) (e)Digital panel mounted Voltmeter & Ammeter flush type of size 96 X 96 mm three phase class (f)Panel wiring with suitable size PVC insulated heavy duty 1100 volts grade single core cable with copper conductor multistranded with cable end terminaion lugs. |
| 45 | Supply, installing, testing and commissioning, factory made and tested,LT panel board outdoor type, weather, vermin proof, cubical type, platform mounted, suitable for 415 volts, 3 phase 4 wire 50 Hz AC supply system all as specified and directed, with necessary bus bar arrangement with insulated bus bar 200 Amps rating , 4 strips, the panel should be dust proof, IP 54 class protection and made out of 3.15mm thick CRCA mild steel sheet with 50x50x6mm angle iron frame with necessary earth work excavation, hinged doors, front and rear opening and locking arrangement and duly powder coated on the out side and inside, cable glands and lugs for incomming and out going cable etc, independent chamber to accommodate incl plinth of panel of suitable size complete all as specified and directed including following accessories :- (a)Changeover, 125 Amp, 415 Volts-01 No( as Incoming) (b)Changeover, 63 Amp, 415 Volts-01 No( as Outgoing) (c)MCCB 4 pole adjustable,63 Amp, 415 Volts 25KA- - 02 Nos (d)Indicating lamps (set 03 Nos)- 01 set (R,Y & B) (e)Digital panel mounted Voltmeter & Ammeter flush type of size 96 X 96 mm three phase class (f)Panel wiring with suitable size PVC insulated heavy duty 1100 volts grade single core cable with copper conductor multistranded with cable end terminaion lugs. |
| 46 | M&L for XLPE insulated, armoured heavy duty electric cable with aluminium conductor, 1100 volts grade, cross-sectional area of size 70mm x 3.5 core laid in trenches / duct or fixed to wall / passing through pipe on pole with suitable size cable glands, crimping type cable lugs for stranded aluminium conductor complete all as specified and directed :- |
| 47 | M&L filling approved river sand in trenches for sand cushioning of laying of cables to the full width of excavated trench 8 cm thick before laying the cable and 15 cm above the cable, gently punned down, stretching and testing of cable on transformer yard etc complete all as specified and directed. Note :- Thickness of sand cushion after punning down shall be measured as 18cm for payment purpose. |
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