Site logo

Electrical Engineering Academy

Cover image 1

Method for Installation of Earthing Strip

METHOD FOR INSTALLATION OF EARTHING STRIP

(A) PURPOSE:

  • The method is to explain the procedure, which should be followed to install the Earthing Strip, Earthing Wire, and Earthing accessories as per the specification to achieve the standard requirements of the project.

(B) EQUIPMENT & TOOLS:

  • The equipment that will be used for Installation of Earthing Strip / Wire works are
  1. Ladder 2. Spirit Level 3. Drilling Machine 4. Grinding Machine 5. Cutting Machine 6. Power tools 7. Measure Tape 8. Screwdriver 9. Drill with bits 10. File 11. Galvanizing paint 12. Bitumius Paint

(C) TEST FOR EARTHING STRIP / EARTHING ACCESSORIES:

  • Visual inspection: * Type of Earthing Strip and Accessories Material * Length , Width and thickness of Earthing Strip and Accessories * Galvanization thickness * Galvanization tests to be conduct. * Proper painting / Galvanization and identification numbers of the Earthing Strip and Accessories * The GS Flat to be supplied in 5.5 meters to 13 meters lengths. * The weight of GS Flat * MS flat shall conform to IS 2062 & its latest amendments for steel & Galvanization as per IS 4759 & its Latest amendments * Physical Damages Inspection: * Damage on Earthing Strip and Accessories * Damage on galvanizing * Testing of galvanizing: * Uniformity of coating Thickness Test * TRs not more than five year old shall be reviewed for acceptance.

Hot dip galvanization. (IS 2629) Galvanizing Minimum thickness: Min. weight: MS flats 5mm thick & over 75 microns (minimum) 610 gms. / sq. mtr. MS flats under 5mm thickness 60 microns (minimum) 460 gms. / sq. mtr. Pipes/ conduits with thickness over 5 mm 75 microns (minimum) 610 gms. / sq. mtr Pipes/ conduits with thickness under 5mm 60 microns (minimum) 460 gms. / sq. mtr GI Wire 20 Microns (Medium coated) 150 gms. / sq. mtr.

(D) STORAGE & HANDLING:

  • The Earthing Flat shall be supplied in standard lengths. * Materials should be stored according to a specification which is the maximum 1.5m height from the ground. Suitable support should be provided. The storage should be done in a designated area and proper covering should be provided. * Earthing Strip and Accessories (pre-galvanized, hot dipped galvanized) shall be stored in a dry place, fully enclosed / ventilated store. * When bringing down materials, they should be handled with care and lowered carefully to the ground. They should not be dropped.

(E) PREPARATION FOR EARTHING STRIP / WIRE

  • Check and ensure that the correct size and type of Earthing Strip & accessories are ready for installation. * Ensure that the work area is ready and safe to start the installation of Earthing Strip. * Ensure that Earthing Strip and accessories received from site store for the installation are free of rusty parts and damages.

(F) EARTHING STRIP INSTALLATION:

  • MARKING THE ROUTE:

  • Mark the route of Earthing Strip with marking threads. * The route of Earthing Strip to be coordinated with other services and shall be confirmed. * Minimum space from the building structure and other services to be maintained (200 mm from the nearest point) to facilitate easy handling and maintenance.

  • SATIATING OF EARTHING STRIP / ELECTRODE:

  • Hot-dip galvanized strip steel is aligned on simple straightening machines or on a parallel by hammer.

AA

  • INSTALLATION ON WALL / GROUND:

  • GI strips used for earthing shall be minimum 6 mm thick and hot dip galvanized. * If round GI conductors are used it shall have double the calculated area of cross-section. * For installing earth leads on walls, special clamps are employed. They firmly accommodate the earth leads and are easily mounted. They are directly inserted in the wall or screwed to the wall. Fixing should be spaced not more than 1 m apart. * Joints and junctions of earth leads and earthing concentration leads are to warrant a durable, safe and electrically well conductive connection.

AA - Copy

  • Where a Copper conductor is to be joined to GI, the joints should be tinned to prevent electrolytic action. * If atmosphere is corrosive, GI conductors shall not be used for earthing. * Earthing strips may be placed together with underground cables in cable Trench, but the heat from the cable must not be able to dry out the soil. * Earth conductors in trenches having power or multi-core cables should be fixed to the walls near the top (for example, 100 mm from the top). * Copper earth strip supported from or in contact with galvanized steel should be tinned to prevent electrolytic action. * Sharp bends required in aluminum strip should be formed by the use of a bending machine. * Earthing Strip which install below ground should be covered adequate insulating Sleeve for avoid corrosion.

  • EARTHING ELECTRODE (PLATE / PIPE):

  • Minimum distance between earthing electrode (Plate /Pipe) and adjacent civil structure shall be 1.5 meter. * Earthing grid should be run at …