Earthing. 33.1 The Service Provider must comply with the earthing requirements set out in the LFC's earthing standards and requirements as published by the LFC on xxx.xxxxxxxxx.xx.xx or otherwise advised by the LFC to the Service provider from time to time.
33.2 The LFC will install a 95 or 120 mm2 green earth cable to an earth bar at the end of each row for the connection of Service Provider Equipment.
33.3 The Service Provider's racks and cabinets must be isolated from the building. Isolation must be tested and verified to be 5 Mohm at 100 Volts before connecting to the earth grid.
33.4 Every cabinet or rack must be joined to the earth grid cable by a 6 mm2 green cable.
33.5 Joints of 2 or 4 cabinet or rack cables must be made every 1,200 mm using a crimp tee or line tap connector.
33.6 All earthing schemes at a Central Office must be approved by the LFC.
33.7 All connections to existing earthing systems (including connections from cabinets, racks and signal cabling) must be to the earth bar. The LFC will approve cable sizes and quantities.
33.8 Cable screens must be earthed at the LFC end only, not at the Service Provider's end.
Earthing. Include system to be used (electrodes, deep earth mesh or other), as well as sizes and section of the elements to be used.
Earthing. All racks are earthed. The Service Provider is responsible for the provision, installation and maintenance of earthing of all their equipment within the NBI provided Co-Location rack space. NBI will be responsible for earthing the rack.
Earthing. To provide earthing within the Premises as required by any codes and regulations from time to time in force.
Earthing. Bonded to earth terminal in normal operation
Earthing. (i) Measure resistance of each earth well/rod by isolating the same from station grid as well as from other earth well/ rods and when resistance of two earths at a time measure by D.C. drops method.
(ii) Check continuity of grid conductors and wires.
(iii) Soil resistivity tests.
(iv) In addition to the above any other specified by manufactures shall be carried out as per manufacturer’s instructions.
(v) Measurement voltage across bearing pedestal insulation & between rotor shaft & bearing.
(vi) Test the fire detection system if provided.
(vii) Check operation of protection relays by putting short circuit bat at different location.
(viii) Check open circuit and short circuit characteristics ofgenerators.
(ix) Check load characteristics of exciters.
Earthing. A main earth bar of G.I shall be provided throughout the full length of the Switch Board with a provision to make connections to earth stations on both sides.
Earthing. There shall be two independent earthing stations at least 3 meters away from the pump room. The earthing shall consist of an earth tape connected to an independent plate made of C.I. having a conductivity of not less than 100% international standard. All electrical apparatus, cable boxes and sheath/ armour clamps shall be connected to the main bar by means of branch earth connections of appropriate size. All joints in the main bar and branch bar shall have the lapping surface properly tinned to prevent oxidation. The joints shall be revetted and sweathed. Earth plates shall be buried in a pit 1.2 x 1.2 meter a minimum depth of 3 meter below the ground. The connections between the main bars shall be made by means of three 10 mm brass studs and fixed at 100 mm centres. The pit shall filled with coke breeze, rock salt and loose soil. A.G.I.Pipe of 20mm i/d. with perforationon the periphery shall be placed vertically over the plate to reach ground level for watering. A brick masonry manhole 30 x 30 x 30 cm. size shall be provided to surround the pipe for inspection. A bolted removable link connecting main bar outside the pit portion leading to the plate shall be accommodated in this manhole for testing.
Earthing. System Appendix ' c' Page No-4 Supply, installation, commissioning and testing of the earthing system including cost of the following 3 meter long of 5/8"dia tinned copper electrodes. up-to water level including cost of boring and lowering complete with clamp and 2 X 25mm2 stranded copper conductor from copper rod to ground surface in 1-1/2” uPVC Pipe class D with watering cap manhole with cover as per detail complete in all respects. and the resistance should up to 1-3 Ohms. the installation / test should be conducted in presence of engineer inchage. Job 1 44138 4.2
Earthing. 1. In accordance with Rule 61 of IE Rules, metallic frame of all medium voltage equipments / supporting frames, shall in all cases be connected to 2 separate and distinct earths. The size of such earth wires shall be not less than 4-mm dia. GI wire.
