10.0.11.2 240 Volts, Single Phase, 50 Hz AC socket with switch suitable to accept 5 amps and 15 amps pin round standard plug, shall be provided.
10.0.11.3 Lighting fixture rated for 240 Volts, single phase, 50Hz supply for the interior illumination of the
panel during maintenance shall be provided. The fittings shall be complete with switch-fuse unit and switching of the lighting shall be controlled by the respective panel door switch.
10.0.11.4 Each panel shall be provided with necessary arrangements for receiving, distributing &isolating the DC and AC supplies for various control, signaling, and lighting and space heater circuits.
10.0.11.5 The incoming and sub-circuits shall be separately provided with miniature circuit breakers (MCB). Selection of the main and sub-circuit MCB ratings shall be such as to ensure selective clearance of sub-circuit faults. Each MCB shall be provided with one potential free contact and the same shall be wired for annunciation purpose.
10.0.11.6 Tubular space heaters of adequate capacity and suitable for connection to single phase, 240V, 50Hz supply shall be provided inside each panel and controlled by a thermostat.
10.0.11.7 Switchboard type, back connected semi flush mounting type test blocks with contacts suitably rated shall be provided with links or other devices to enable insertion of a series device into the circuit without causing open circuit in the CT. secondary or to enable short circuiting of the CT.
Secondary.
10.0.11.8 Test block covers shall be removable from the front of the panels and shall be provided with suitable sealing arrangement to prevent unauthorized access to the test studs. If any test plugs are to be used with the test studs, 6 Nos. of each type of such test plugs shall be supplied free with the main equipment.
10.0.11.9 Test link, special terminal boards and other accessories normally required for testing operation and maintenance of all relays and meters shall be furnished by the Vendor.
10.0.12
EARTHING:
10.0.12.2 All panels shall be equipped with an earth bus securely fixed. Location of earth bus shall ensure no radiation interference for earth systems under various switching conditions of isolators and breakers. The material and the sizes of the bus bar shall be at least 50 x 6 mm GI flat or equivalent copper unless specified otherwise. When several panels are mounted adjoining each other, the earth bus shall be made continuous and necessary connectors and clamps for this purpose shall be included in the scope of supply of Vendor. Provision shall be made for extending the earth bus bars to future adjoining panels on either side.
10.0.12.3 Provision shall be made on each earth bus bars of the end panels for connecting Owner's
earthing grid. Necessary terminal clamps and connectors for the purpose shall be included in the scope of supply of Vendor. The size of Owner's earthing grid connections will be furnished later to the Vendor. The earth wire or screens should be clearly bonded and earthed at the gland plate. The earthing scheme shall be got approved
10.0.12.4 All metallic cases of relays, instruments and other panel mounted equipment shall be connected to the earth bus by independent copper wires of size not less than 2.5 sq.mm.
The colour code of earthing wires shall be green. Earthing wire shall be connected on terminals with suitable clamp connectors and soldering shall not be permitted.
10.0.12.5 Looping of earth connections which would result in loss of earth connection to other devices when the loop is broken shall not be permitted. However, looping of earth connections between equipment to provide alternative paths to earth bus shall be provided.
10.0.12.6 VT and CT secondary neutral or common lead shall be earthed at one place only at the terminal blocks where they enter the panel. Such earthing shall be made through links so that earthing may be removed from one group without disturbing continuity of earthing system for other groups.
10.0.12.7 The detailed earthing scheme shall be submitted for approval.
10.0.13
NAME PLATES
:10.0.13.2 All equipment mounted on front and rear side as well as equipment mounted inside the panels shall be provided with individual name plates with equipment designation engraved.
Also on the top of each panel on front as well as rear side large and bold name plates shall be provided for circuit/feeder designation. These circuit labels shall be larger than the other name plates.
10.0.13.3 All front mounted equipment shall also be provided at the rear with individual name plates engraved with tag numbers corresponding to the one shown in the panel internal wiring to facilitate easy tracing of the wiring. The name plates shall be mounted directly by the side of the respective equipment and shall not be hidden by the equipment wiring.
10.0.13.4 Name plates shall be made of non-rusting metal or 3 ply lamicoid. Name plates shall be black with white engraving lettering. The name plate inscription and size of name plates and letters shall be submitted to the Owner for approval.
10.0.13.5 Each instrument and meter shall be prominently marked with the quantity measured (e.g. kV, A, MW etc.). All relays and other devices shall be clearly marked with manufacturer's name and type, serial numbers and electrical rating data.
10.0.13.6 Each switch shall bear clear inscription identifying its function. Similar inscription shall also be provided on each device whose function is not otherwise identified. If any switch device does not bear this inscription separate name plate giving its function shall be provided for it.
Switch shall also have clear inscription for each position indication .
10.0.13.7 All relays and other devices shall be clearly marked with manufacturer's name, manufacturer's type, serial number and electrical rating data.
10.0.14 PAINTING:
10.0.14.2 The color shall be RAL 7032 for the enclosure 10.0.14.3 All metallic parts shall have rust protection.
10.0.14.4 All steel surfaces shall be thoroughly cleaned by sand blasting or chemical agents as required, to produce a smooth surface free of scales, grease and rust.
10.0.14.5 The external surfaces, after cleaning, shall be given a coat of high quality red oxide or yellow chromate primer followed by filler coats.
10.0.14.6 Sufficient quantity of touch up paint shall be furnished for application after installation at site.
10.0.14.7 All supporting structures and hardware shall be hot dip galvanized.
10.0.15
DOCUMENTATION:
10.0.15.2 Vendor shall submit the following documents for all equipment along with offer:
a. Data sheet (Separate for CRP and Relays) b. Tentative GA Drawings.
c. Catalogues d .Wiring diagram e. Test certificates.
f. Deviation List
10.0.15.3 Vendor shall submit the following documents for all equipment after award of job for approvals:
a.Datasheets (Separate for CRP and Relays) b. Tentative GA Diagrams
c. Quality plan.
d. Shipping drawing showing the dimensions and weights.
e. Erection drawings.
f. Rating plate drawing
g. Valid Type test Reports – 2 sets h. O&M manual of relays
10.0.16
TEST
:10.0.23.1 ROUTING TEST:
Control & Relay Panel shall also be subjected to following tests:
a. Mechanical operation Test.
b. Verification of degree of protection as per IS: 2147.
c. High voltage test/Insulator Resistance Test.
d. Electrical control, interlock & sequential operation test.
e. Verification of wiring as per approved schematic. 10.0.23.2
TYPE TEST :
Test certificates not older than 5 year from date of supply for All relays and instruments of following test
a. Insulation tests
b. High frequency disturbance test c. Impulse test
d. Fast transient test
e. Relay characteristics, performance and accuracy test as per IEC 60255 f. Tests for thermal and mechanical requirements
g. Contact performance test