Earthing. This specification covers supply, delivery, installation and testing of the complete grounding system as described below. Station earth points shall be constructed to provide grounding points for all earth continuity conductors used in this installation. Station earths shall be as specified in the appropriate Indian Standards or equivalent. All lap, cross and tee connections between two grounding conductors shall be made by thermo-welding process or compression type connector. The various joints shall have adequate mechanical strength as well as necessary electrical conductivity not less than that of the parent conductors of the joints. All accessories for grounding installation shall be of quality and design approved by the Engineer. Ground conductors, when crossing underground trenches, directly laid underground pipe and equipment foundation, if any, shall be at least 300 mm below the bottom elevation of such trenches/pipes. Complete installation of the ground, test link chamber, grounding of all but not limited to the equipment located in the building and substation as specified herein. The supply of grounding conductors, jointing materials and all accessories to complete this grounding installation so as to obtain the specified value of earth resistance shall be covered under this specification. The installation shall be complete in all respects for efficient and trouble free service. All work shall be carried out in a first class neat ▇▇▇▇▇▇▇ like manner. Grounding conductors shall be handled carefully to avoid kinking and cutting of the conductors during laying and installation. All exposed ground conductors runs shall be taken in a neat manner, horizontal, vertical and parallel to building walls or columns and shall not be laid haphazardly. For all connections made to equipment or to the structures, the grounding conductor, connectors and equipment enclosures shall have good clean contact surfaces. Grounding conductor connection to all electrical equipment, switchgear, motors, panels, conduit system, equipment enclosures, cable trays, distribution boards, equipment frames, bases, steel structure, etc. shall be by pressure type or bolting type connectors. The earth resistance shall not exceed 5 ohms. On completion of the installation, either wholly or in sections, it shall be tested in compliance with relevant Code by the Contractor in presence of the Engineer. If the earth resistance cannot be obtained as per specified value, then additional earth electrode shall be installed and treated soil to obtain the required low ground resistance without any additional cost.
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Sources: Contract Agreement, Procurement Agreement, Contract Agreement