Method Statement - Earthing & Lightning Protection [PDF]

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EW/ELEC/MS-07



DOC.NO.



1



ISSUE :-



05/01/16



DATE :-



1



PAGE :-



INSTALLATION OF EARTHING & LIGHTNING PROTECTION SYSTEM



METHOD STATEMENT FOR INSTALLATION OF EARTHING & LIGHTNING PROTECTION SYSTEM AL SHAHAD TOWER 5B+G+38 DOHA, THE STATE OF QATAR



Rev. 0



Date 05/01/16



Prepared By



Reviewed By



Approved By



Description



EW/ELEC/MS-07



DOC.NO.



1



ISSUE :-



05/01/16



DATE :-



2



PAGE :-



INSTALLATION OF EARTHING & LIGHTNING PROTECTION SYSTEM



This Cover Page is a record of all revisions of the document identified above by numbers and title. All previous Cover Pages are hereby superseeded and are to be destroyed. - INDEX -



.Item



No



Page No.



1.0



SCOPE.........................................................................3



2.0



PURPOSE.....................................................................3



3.0



REFERENCE.................................................................3



4.0



QUALITY CONTROL......................................................3



5.0



MATERIAL USED..........................................................3



6.0



STORAGE AND HANDLING............................................3



7.0



TOOLS AND EQUIPMENT..............................................4



8.0



SAFETY........................................................................4



9.0



INSTALLATION PROCEDURE........................................4



10.0



TESTING AND INSPECTION



EW/ELEC/MS-07



DOC.NO.



1



ISSUE :-



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DATE :-



3



PAGE :-



1.0



INSTALLATION OF EARTHING & LIGHTNING PROTECTION SYSTEM



SCOPE



The scope is to cover the method required for the installation of earthing .and lightning protection system 2.0



PURPOSE



The purpose of this procedure is to define the method of installation for .earthing system for the above project 3.0



REFERENCE



The following are to be used as references for the installation of earthing & lightning protection system



4.0



3.1



Approved Material Submittal



3.2



Project Specification (Division 16 ref:16744 & 16060)



3.3



Approved Shop Drawing



QUALITY CONTROL



Quality of installation at site shall be ensured by project team of Engineer’s, .Supervisor and QA/QC The supervisor shall supervise the installation work and the engineer’s shall check and approve the installation according to specifications and approved .shop drawing for installation of earthing and lightning protection 5.0



MATERIAL USED



Materials to be used shall be as per the approved material and should be .inspected prior to use 6.0



STORAGE AND HANDLING 6.1



Materials must be stored in a dry place and they must be handled carefully.



EW/ELEC/MS-07



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6.2 7.0



INSTALLATION OF EARTHING & LIGHTNING PROTECTION SYSTEM



Materials must be protected from direct sun light by placing them in sun shades.



TOOLS AND EQUIPMENT



The following tools and equipment shall be used for installation of earthing :system 7.1



Welding Machine



7.2



Hand tools



7.3 8.0



9.0



Testing Equipment: Earth Resistance Megger



SAFETY 8.1



Safety equipment like Hard hats, Safety shoes, Coveralls, Gloves Goggles when necessary etc. to be worn at all times.



8.2



Ensure work area is clean and tidy.



8.3



Ensure adequate workface lighting is available.



INSTALLATION PROCEDURE 9.1



Check approval of the material submittal. Confirm materials supplied to site are as per contract requirements.



9.2



Install earthing and lightning protection system in full compliance with the requirements of Local authorities, and project specification.



9.3



Check the complete earthing and lightning protection system is electrically and mechanically continuous to provide an independent fault current return path to the earthing source.



9.4



Check earthing terminal connectors and brazing equipment and bolted connections carried out as per standards.



9.5



Check the impedance of equipment (earth loop) at any point in the electrical wiring system, which has to be sufficiently low to limit the voltage to earth and to facilitate the operation of the circuit protective devices in the circuits.



EW/ELEC/MS-07



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INSTALLATION OF EARTHING & LIGHTNING PROTECTION SYSTEM



9.6



Complete lightning protection rebar welded to the piles cap in accordance with the piles layout. Location and approved shop drawings.



9.7



Complete earthing pits buried under ground in accordance with the project layout, location and drawings.



9.8



System earthing will be for non-current carrying metal part of the electrical installation such items as cabinets, exposed metal parts apparatus as well as enclosures, doors grilles, etc., protecting or shielding electrical equipment from direct access to unauthorized personnel.



9.9



All socket outlets, power apparatus, lighting fixtures, switches, switchboards or panel boards, shells of all water heaters, etc., will be earthed.



9.10 After completion of installation earthing resistance check to be done as per regulation and required values. 9.11 Earthing System shall be installed as per project specification.



10.0 TESTING AND INSPECTION 10.1



On completion of the installation the following isolated and combined measurement and / or checklists has to be made and the results recorded in a lighting protection system checklist.



10.2



The resistance to earth of each local earth electrode and in addition the resistance to earth of the complete earth termination system.



10.3



Each local earth electrode has to be taken with the test point between the down conductor and the earth electrode in the disconnected position (isolated measurement)



10.4



A further measurement has to be taken with the test point in the connected position (combined measurement).



EW/ELEC/MS-07



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INSTALLATION OF EARTHING & LIGHTNING PROTECTION SYSTEM



10.5



The resistance of earth electrode will be checked with the calibrated earth resistance tester for the value of less than 5 Ohms as per specification .If the resistance is nor achieved further earth electrode will be driven to the ground untill achieving the specified earth resistance .System include



10.6



The result of visual check of all conductors, bonds and joints and their measured electrical continuity



. - END



OF METHOD STATEMENT -