PANEL SPEICIFICATIONS SCOPE This Specification covers the Design, Fabrication, Assembly, Testing, Packing & Supply of 415/ volts, 3 phase, 4 wire Indoor Fixed type single / double front compartmentalized Power Control Centers & APFC Panels APPLICABLE STANDARDS The switchgear and its components shall conform to the latest applicable standards specified below. In case of conflict between the standards and this specification, this specification shall govern. Switchgear General Requirements. IS:13947/BS:5486/IEC:947 Factory Built Assemblies of SWGR and Control gear for voltages upto and including 1000V AC & 1200V DC.

IS:8623/BS:5486/IEC:439

Air Break Switches

IS:13947-P3/BSEN 60947/IEC:947-3

Miniature Circuit Breakers

IS:8828/BSEN:60898

Low Voltage Fuses

IS:13703/BSEN 60947-4/IEC:947-1

Contactors

IS:13947/BSEN 60947-4/IEC:947-1

Starters

IS:13947/BSEN 60947-4/IEC:292-1 TO 4

Control Switches / Push Buttons

IS:6875/BSEN 60947

Current Transformers

IS:2705/BS:7626

Voltage Transformers

IS:3156/BS:7625/IEC:44, 186

Indicating instruments

IS:1248/BS:89/IEC:51

Marking and Identification of Conductors and Apparatus Terminals

IS:11353/BS:159

A.C. Electricity Meters

IS:722, 8530/BS:5685/IEC 145, 211

Degree of Protection

IS:13947/IEC:947-P1

Selection installation and maintenance of switch gear and control gear

IS:10118

Code of practice for phosphating iron and steel

IS:6005/BS:3189

Specification for copper rods and bars for electrical purposes

IS: 613

Control transformers for switch gear and control gear voltage not exceeding1000V AC

IS: 12021

Circuit Breakers

IS-13118, BS-5311, IEC-56 & 694 BSEN-60942 (P-2)

Control Switches

IS-6875/BSEN60947, IEC-947

Wrought aluminum and aluminum alloy bars, rods, tubes and sections for electrical purposes

IS: 5082

Marking and arrangement for switchgear, bus bars main connection and auxiliary wiring.

IS-5578 IS-11353

GENERAL CONSTRUCTION The panels shall be designed, manufactured and tested in accordance with the latest versions of the related applicable standards and as per the specifications issued by you. The panels shall be of modular design with a horizontal busbar compartment running at the top and the cable entry shall be from the bottom. The outgoing feeders shall be arranged in multi-tier mode. The panel front shall contain individually enclosed ACB /MCCB / STARTER modules. All of the electrical accessories shall be mounted on the front side of the panels with facility to remove/refit from the front side. Completely enclosed vertical busbars shall be provided for feeding to the feeder modules. Complete metallic partition sheets shall be provided between any two adjacent vertical panels or horizontal feeders. All feeder chambers and the cable chamber shall be provided with hinged doors. For the bus bar chamber, the doors shall be of bolted type. Suitable cable core clamping arrangement shall be provided in the cable alley/chamber. Each feeder compartment shall be provided with suitable nameplate showing the panel details like STARTER/SFU/MCCB rating. All live parts shall be shrouded with non-deteriorating insulating barrier to prevent against accidental contact. FABRICATION DETAILS An integral metal base channel of 75x40mm size shall be provided. All of the Gland plates shall be of 2.5mm (12SWG) CR. Sheet. 2.0mm (14 SWG) CR shall be used for fabrication of the main frame of the panel and hinged doors. 1.6mm (16 SWG) CR. Sheet shall be used for compartmental partitions inside the panel board.

Neoprene gasket shall be provided for the doors to prevent dust and vermin entry. Suitable ventilation louvers shall be provided onto the vertical and horizontal busbar chambers to facilitate free circulation of air. Suitable brass meshes shall be fitted to prevent entry of vermin. The door hinges shall be of concealed type. Removal of any hinged door without disturbing any of the adjacent modules shall be possible. All the punching jobs shall be carried out in the CNC MACHINES. PAINTING All sheet steel parts shall be subjected to a finishing process of chemical degreasing, pickling, and phosphating by ‘7’ tank process. Thorough rinsing shall be carried out after phosphating before powder coating. The panel shall be finally finished with powder coating. The thickness of the powder film shall be 60-70 microns. The powder-coated panel shall be baked in oven at 180 degree C for duration of 15/20 seconds. The finishing of the completed panel shall be elegant and enduring. BUS BARS Three phase and neutral Aluminium busbars of E91E grade shall be provided. They shall be of uniform cross section throughout the panel with a current density of 80 Amps per square centimeter. Tough, non-hygroscopic shall support the busbar conductors; resin bonded self extinguishing fire retardant insulators of SMC/DMC type firmly fitted to the framework of the panel. Suitable color coded heat shrinking sleeves shall be provided for the busbar conductors with color coding. Provision for expansion with necessary hardware and fishplates shall be provided in the horizontal busbar chamber on both extreme ends of the panel. The contact surface for joints shall always be maintained above the width of the bars. Cadmium plated high-tension bolts and nuts shall be used for the joints. Spring washers shall be used for sustaining the contact pressure. White petroleum jelly shall be applied on the joint surfaces before joining for preserving the efficiency of the joints. The following minimum clearances shall be maintained in the panel.

Between two phases : 25mm Between phase & earth : 25mm Between phase & neutral : 25mm Between neutral & earth : 19mm

All the live bus bars shall be covered with transparent acrylic sheets / FRP. sheet.

EARTHING Earth busbars of minimum 300 Sqmm size shall be provided throughout the length of the panel. Within the panel board all the switchgear bodies shall be duly connected to the earth busbars. Provision for connection to the plant earth grid shall be provided at both the ends of the panel. All hinged doors with electrical accessories shall be provided with flexible copper earth connections. WIRING Power Wiring shall be carried out with minimum 2.5 Sqmm size of 660/1100V grade multistrand single core copper flexible wires. CT Wiring shall be carried out with 2.5 Sqmm size of 660/1100V grade multistrand single core copper flexible wires. Inter connections in the starter and MCCB feeders upto 63 Amps rating shall be carried out with suitable rated copper conductor multistrand wires. Above 63 Amps rating, Aluminum busbars shall be provided for interconnections for MCCB feeders and tinned copper busbar links shall be provided for interconnections for starters. Ammeter and selector switch shall also be mounted on the door for the desired feeders. All the power and control wires shall be wired upto the clipon type terminals mounted on the edge of the feeder base sheet in the cable alley for facilitating easy cable termination. All the control wires shall be wired upto the Control terminals of Nylon Unbreakable type “ PHONIX” make mounted on the edge of the feeder base sheet in the cable alley for facilitating easy cable termination.

Tube type Insulated copper lugs shall be used for terminating the control wires.

Remote operation scheme shall be provided for every starter and it shall be terminated at Connectors All the wires at the terminal block shall be identified properly by providing suitable number/letter ferrules. All Switchgear shall be of AC 23 duty. Instruction, Operation and maintenance manuals of items like Breakers, Relays, etc shall be submitted along with dispatch document.

TESTING The following tests to conducted before despatching of the panels

a. Operation Test.

b. High Voltage Test

c. Temperature rise test

d. Impulse with stand test

e. Meggar Test

f. Interlock Operation