GAIL (India) Limited
GAIL (India) Limited GAIL (India) Limited
135. Switch Fuse Units:5.1 GeneralThe switch fuse units shall be of the load break, heavy duty, cubicle type conforming to the requirementsIS and of AC 23 duty.The switch fuse units shall he capable of withstanding the thermal and electromagnetic stresses caused byshort circuits for the time of operation of the associated fuse links.The switch fuse units shall be double break and have quick make break mechanism, designed to ensurepositive operation.All switch fuse contacts shall be silver plated at the current transfer surfaces.The unit shall he provided with a front operating handle. The ON and OFF positions of the switch handleshall be clearly marked.5 2 Interlocks and SafetyInterlocks shall be provided so as to prevent opening of the unit door when the switch is in the ONposition and also to prevent closing of the switch with the door not properly secured. It should however bepossible for a competent person to operate the switch shall be suitable for locking with switch in the OFFposition by means of a padlock.The interior arrangement of the switch fuse unit shall be such that all ‘live’ parts are shrouded,5.3 HRC Fuses:The switch fuse units shall be fitted with High rupturing capacity cartridge fuse links with ISI marking fora rupturing capacity of not less than 50 KA at 415 volts. The fuse links shall be mounted in a draw outcarriage thus ensuring positive isolation of contacts during fuse replacements.6. Current Transformers.Current transformers shall comply with the requirements of relevant latest amendment IS. They shall haveratios, outputs and accuracy as specified in the schedule.7. Indicating / Integrating Meters:All indicating instruments shall he of flush mounted industrial pattern conforming to the relevant latestamended IS. The instrument shall have non-reflecting bezels, clearly, divided and indelibly marked scales.And shall be provided with zero adjusting devices in the front. Integrating instruments shall be of flushmounted switchboard pattern complying with the requirements of relevant latest IS.8. Relays: Circuit breakers shall be provided with integrally mounted relays as specified in theschedule.The relay shall have a set of three phase characteristics, which shall be adjustable over a wide range, toprovide discrimination between multiplicities of devices. The relay shall be able to provide over currentand earth fault protection. Also UV and Shunt trip Relays are to be provided.9. Control switches/Selector switches: Control switches/Selector switches shall be of the heavy-duty rotarytype, with plates clearly marked to show the operating position. They shall be of semi-flush mounted typewith only the front plate and the operating handle projected.10. Contactors : Contactors shall be 3 pole /4 pole load break AC 23 duty with auxiliary contacts,fixed & moving contacts copper tinned, silver coated, interier type ,ounting base frame din rail channel.
1411. Indicating lamps and push buttons:Indicating lamps shall be of the LED type of low watt consumption, provided with series resistors wherenecessary and with translucent lamp covers. Bulbs and lenses shall be easily replaceable from the front.Push buttons shall be of the momentary contact, push to actuate type fitted with self-reset contacts andprovided with plates marked with its junctions.12. Cable terminations:Cable entries and terminals shall be provided in the switchboard to suit the number, type and size ofaluminium conductor power cables and copper conductor control cables as indicated in the schematicdiagram.Provision shall be made for top or bottom entry of cables as required Generous size of cabling chambersshall be provided, with the position of cable glands and terminals such the cables can be easily and safelyterminated.Barriers or shrouds shall be provided to permit safe working at the terminals of one circuit withoutaccidentally touching that of another live circuit.Cable riser shall be adequately supported to withstand the effects of rated short circuit currents withoutdamage and without causing secondary faults.Cable sockets shall be of copper and of the crimping type/soldering as required.13. Control wiring: A1l control wiring shall be carried out with 1100/650 V grade multistandard Copperflexible wire conforming to relevant IS having stranded: copper conductors of minimum 2.5 sq. mmsection for CT Wiring and 1.5sq mm for Control/indicating Instruments.Wiring shall be neatly bunched, adequately supported and properly routed to allow easy access andmaintenance.Wires shall be identified by numbered ferrules at each end. The ferrules shall be of the ring type of nondeterioratingmaterial. They shall be firmly located on each wire so as to prevent free movement.All control circuit fuses shall be mounted in front of the panel and shall be easily accessible.14. Terminal blocks and labels:15. Tests:Terminal block shall be of 500 volts grade of the stud type. Insulating barriers shall be provided betweenadjacent terminals.Terminal block shall have minimum current rating of 10 amps and shall be shrouded. Provisions shall bemade for label inscriptions.Labels shall be made of anodized aluminium, with white engraving on black background. They shall beproperly secured with fasteners. Danger plate of size and descriptions as recommended in the relevant ISshall be provided on the PCC./PDB/MCC.i) The power control centre shall be completely assembled, wired, adjusted and tested for operation undersimulated conditions to ensure correctness of wiring and interlocking and proper functioning of allcomponents.ii) Each power control centre and components shall be subjected to standard routine tests as per applicableclauses of relevant standards.
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135. Switch Fuse Units:5.1 GeneralThe switch fuse units shall be of the load break, heavy duty, cubicle type conforming to the requirementsIS and of AC 23 duty.The switch fuse units shall he capable of withstanding the thermal and electromagnetic stresses caused byshort circuits for the time of operation of the associated fuse links.The switch fuse units shall be double break and have quick make break mechanism, designed to ensurepositive operation.All switch fuse contacts shall be silver plated at the current transfer surfaces.The unit shall he provided with a front operating handle. The ON and OFF positions of the switch handleshall be clearly marked.5 2 Interlocks and SafetyInterlocks shall be provided so as to prevent opening of the unit door when the switch is in the ONposition and also to prevent closing of the switch with the door not properly secured. It should however bepossible for a competent person to operate the switch shall be suitable for locking with switch in the OFFposition by means of a padlock.The interior arrangement of the switch fuse unit shall be such that all ‘live’ parts are shrouded,5.3 HRC Fuses:The switch fuse units shall be fitted with High rupturing capacity cartridge fuse links with ISI marking fora rupturing capacity of not less than 50 KA at 415 volts. The fuse links shall be mounted in a draw outcarriage thus ensuring positive isolation of contacts during fuse replacements.6. Current Transformers.Current transformers shall comply with the requirements of relevant latest amendment IS. They shall haveratios, outputs and accuracy as specified in the schedule.7. Indicating / Integrating Meters:All indicating instruments shall he of flush mounted industrial pattern conforming to the relevant latestamended IS. The instrument shall have non-reflecting bezels, clearly, divided and indelibly marked scales.And shall be provided with zero adjusting devices in the front. Integrating instruments shall be of flushmounted switchboard pattern complying with the requirements of relevant latest IS.8. Relays: Circuit breakers shall be provided with integrally mounted relays as specified in theschedule.The relay shall have a set of three phase characteristics, which shall be adjustable over a wide range, toprovide discrimination between multiplicities of devices. The relay shall be able to provide over currentand earth fault protection. Also UV and Shunt trip Relays are to be provided.9. Control switches/Selector switches: Control switches/Selector switches shall be of the heavy-duty rotarytype, with plates clearly marked to show the operating position. They shall be of semi-flush mounted typewith only the front plate and the operating handle projected.10. Contactors : Contactors shall be 3 pole /4 pole load break AC 23 duty with auxiliary contacts,fixed & moving contacts copper tinned, silver coated, interier type ,ounting base frame din rail channel.
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