project 36 MW 1.0 INTRODUCTION AND PROJECT INFORMATION

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1 1.0 INTRODUCTION AND PROJECT INFORMATION Welspun Energy Ltd. is executing 18MW + 18MW + 14MW Solar PV Power Project for Mahagenco in Maharashtra (Site Location: Shirsuphal, Baramati Taluka, District Pune, Maharashtra) on PPP basis. This specification covers the requirements of DC cable for 2 x 18MW Units as specified under different sections for the aforementioned project. 2.0 INTENT OF THE SPECIFICATION This Specification is intended cover the technical requirement for the supply of double insulated, cross linked DC cables for photovoltaic power applications. These cables are used to interconnect solar modules and connect combiner boxes to inverter 3.0 QUALIFICATION REQUIREMENT Manufacturer shall have in house electron beam cross link facility and shall have successfully supplied cable for Solar Power Plants for at least 50 MW capacity. The DC cable manufacturer shall have proven experience of having supplied successfully to SPV grid connect projects of at least 500MW cumulative capacity. 4.0 TECHNICAL PARAMETERS FOR DC CABLES All DC cables shall be unarmored sunlight resistive halogen free in accordance with IEC , Ozone resistance in accordance with EN Conductor shall be Electrolytic tinned copper Class 5, according to EN60228 or IEC Core insulation & outer sheath of the cable shall be as per XLPO (Electron beam cross linked polymer), fine wired in accordance to VDE 295 class5/iec class 5, rated voltage shall be 1100/1500V & maximum permissible operating voltage shall be 1800V DC. Normal Operating temperature range shall be -40 deg C to +90 deg C with maximum permissible operating temperature 120 deg C, maximum short circuit temperature shall be 280 deg C. DC test voltage 15kV, and type of insulation shall be according to IEC , EN DC Cable shall be weather/uv resistive according to the HD 650/A1, Acid /brine resistance as per EN , Flame resistance according to IEC Cable shall be rodent resistive. The DC cables shall be TUV certified Doc No: CSSEL1-WEL-608-TSP-0102 Page 2 of 6

2 S. No. Description Details Unit 1. Cable Type Solar UV DC Cable 2. Core Single 3. Size 6.0, 70, and 300 mm2 4. Conductor 5. Max. Conductor DC resistance as per IEC 20 C 6. Insulation 7. Outer sheath 8. Sheath color ATC, stranding according to VDE 0295/ IEC 60228, class for 6 sq mm for 70 sq mm for 300 sq mm Polyolefin Copolymer electron beam cross linked, halogen free 50 % QTY in RED 50 % in BLACK Polyolefin copolymer, Electron beam cross linked Black for negative 9. Application Outdoor use Black with red stripes for positive Ohm/km 10. Life 25 Years 11. Rated Voltage 1800 DC V 12. Conductor Temp Range Up to 120 (minimum) 13. Ambient Temp Up to 60 (min) 14. Max. Short circuit temp. Up to Bending Radius according 20 OD 16. DC test voltage 15 KV 17. Markings Manufacturer name, cable type, diameter at every 550 mm Progressive sequential marking of length at every 1mtr. 5.0 INFORMATION REQUIRED FROM BIDDER 1. Is solar cable compatible with MC4/WM4 and other connectors 2. List of IEC Certificates Received 3. List off Reference Solar PV Power Doc No: CSSEL1-WEL-608-TSP-0102 Page 3 of 6

3 Plant Projects 4. Conductor Resistance at 20 Ohm/km Maximum Permissible DC 5. V Voltage Maximum Permissible Current Carrying Capacity at 20 Maximum Permissible Current Carrying Capacity at 60 deg C in air A Amps 8. No. of strands 9. Nominal diameter of each strand mm 10. Max diameter of each strand mm 11. Outer diameter of cable 12. Insulation material 13. Cross linking process 14. Insulation thickness mm 15. Outer sheath material 16. Outer sheath thickness mm 17. Arrhenius Test Required for 2000 hrs. at TUV certificate Bidder to attach copy of certificates and test reports * Bidder to enclose cable cross section drawing * Cable shall be supplied in Non-returnable wooden/steel drums. Minimum length shall be 500 M+/-10m. *After approval from Mahagenco, six sets of final and approved drawings shall be provided alongwith soft copy in a CD for onward submission to MAHAGENCO 6.ODES AND STANDARDS S. No. Title Standards/ material properties 1. Fire Performance IEC Approvals TǛV PFG 1169/ PV1-F 3. Hot pressure test 140 IEC Halogen free EN EN Weathering/UV test HD 605/A1, part , HD 605 S1/A1 6. Cold Blend/Cold Impact IEC Hot Pressure Test IEC , test temp 140 with load for 4 Doc No: CSSEL1-WEL-608-TSP-0102 Page 4 of 6

4 hours 8. Humidity Test 1000h / 90 C / 85% rel. 9. Weathering / UV Test HD 605/A1,part , HD 605 S1/A1 7.0 List of acceptance test to be carried out a. Constructional and dimensional test b. Conductor resistance test c. Test for thickness of insulation and sheath d. Hot set test for insulation e. Tensile strength and elongation at break test for insulation and sheath f. High voltage test g. Insulation resistance test (volume resistivity test) h. Flammability test and flame propagation test. i. Halogen acid test 8.0 List of documents to be submitted by the bidder along with the bid a. Name of the company, address, date of establishment, nature of business, name and quantity of item, annual manufacturing capacity, applicable IS/ASTM/IEC standards b. Compliance of standards IEC/ASTM/IS and certification from accredited institutions c. Experience in solar field: material supplied to solar power project; name of the power plant, capacity, quantity supplied, year of supply, etc. d. Guaranteed Technical Parameters duly signed and sealed by vendor/manufacturer and SPC. e. Authorized technical specification datasheet of the equipment published in public domain / website. f. Technical Experience and performance certificates as specified in this document from a competent authority/solar power project developer. g. Manufacturing facility details complete with equipment and process details. h. Detailed Quality Assurance Plan along with testing facilities at factory. Doc No: CSSEL1-WEL-608-TSP-0102 Page 5 of 6

5 9.0 BOQ for DC CABLES S. No. Cable Size (mm 2 ) Cable Description Cable for ve and black outer sheath Cable for +ve and red outer sheath Cable Cable. Qty (Indicative for Solar Project) Unit 184 KM 184 km 9 KM 28 km * As per actual calculation of DC cable from SMU to inverter, the size is coming to be 70 sq mm (keeping margin) for 12 input SMU. However 300 sq mm cable is considered in BOQ as per mahagenco specification document. Doc No: CSSEL1-WEL-608-TSP-0102 Page 6 of 6