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1.0. Purpose
This method statement covers the onsite construction of Earthing and Bonding system as defined in the project specifications. Earthing and Bonding is the most effective method in providing electrical protection to a person, properties, and the environment by discharging and eliminating the presence of stray current and decay voltage produced from electrical fault or lightning directly to earth. The continuity of the earth path is ensured through the proper selection of material, size, and installation of the Earthing and bonding system.
2.0. Scope of Works
The scope of this Method Statement is to detail the method of installation to ensure that Earthing & Lightning Protection is correct and acceptable and confirm the contract document specification and international standards.
3.0. References
3.1. STATE/COUNTRY Code of Practices.
3.2. (YOUR STATE/COUNTRY) Regulation.
3.3. Project General Specification Section.
3.4. Approved Project Electrical drawings.
3.5. Manufacturer recommendations I installations instruction.
3.6. Project Safety Plan.
3.7. Approved Material Submittals.
4.0. Safety
The project safety plan shall be adhered to during the complete Installation of Earthing & Lightning. Necessary safety precautions shall be taken care of.
4.1. All employees shall wear PPE which shall be fit for purpose.
4.2. Safe access to the place of work shall be provided for all employees, including installation at height.
4.3. Only qualified and competent electricians shall perform the work following relevant codes and practices.
4.4. Good House Keeping shall be performed before leaving the work area.
4.5. All heavy equipment like forklifts and cranes used for installation shall have a third-party certificate.
4.6. Refer to the Risk Assessment sheet for Earthing & Lightning system installations.
5.0. Responsible personnel
The following is the list of personnel who will be responsible for carrying out the installation of Earthing & Lightning protection.
5.1. Safety Engineer
5.2. Project Engineer - Electrical
5.3. QA/QC Engineer - Electrical
5.4. Supervisor I Forman - Electrical
6.0. Tools/Tackles
- A complete set of electrician toolboxes shall be available at the site.
- Electrical grinder, drill, and bore the whole machine.
- Hand tools required: Screwdriver (various sizes), hack saw, meter, marker, hummer, and level.
- Electrical meters: Electronics Earth Resistance Tester, VOA meter.
7.0. Material Readiness I Preparation
- The site Engineer and Supervisor shall ensure that necessary fastening materials, complete tools, and tackles are available at the site before the commencement of work.
- The earthing and bonding materials shall be inspected upon delivery to the site. Material Inspection form shall be raised and submitted to the consultant for inspection.
- The material shall be stored in a clean and dry area and shall not be mixed with ferrous materials (iron, steel, and GI materials).
8.0. Application
Earthing and lightning protection material shall be installed as per (YOUR STATE/COUNTRY) Regulation, IFC (Issued for Construction), and approved shop drawings.
9.0. Method of Installation
- The Electrical Engineer and Supervisor I Foreman shall have approved drawings and a set of the layout where the proposed earthing routes are based on the pictures.
- All the installation works are to be carried out following the approved shop drawings. Copy of the approved method statement shall be available at the site during the installation works.
- Manufacturer recommendations and manual instructions shall be strictly adhered to at the installation of the system.
9.1. Lightning protection system
9.1.1. Routing of earthing and lightning protection air terminal conductor bar shall be marked on the roof layout in coordination with HVAC services and lift machine rooms as these services are present on the roof.
9.1.2. Base clips shall be fixed on the parapet/floor as required. Fasteners shall be of appropriate size and as per the approved material.
9.1.3. The tape shall run through the clip and it shall be supported to the parapet /floor by the clips. The clips shall be adequately tightened.
9.1.4. Any bends in the tape shall be made straight by using a rubber hammer. Spacing between the DC clips shall be maintained as per the approved layout drawings and manufacturer recommendations.
9.1.5. Air terminal points shall be installed at the top of the structure as shown in the approved layout drawings. Air terminal points and strike pad shall be installed per the approved drawings' details.
9.1.6. Strike pads and Air termination points shall be installed securely to the base parapet/floor adequately.
9.1.7. The lightning conductor shall be connected to the strike pads and all termination appropriately.
9.1.8. Based on the drawing and in comparison with the layout down conductors for lightning protection should follow the most direct path possible between the air terminal termination and the hearth pit. In case of the Engineer has another preferred route he should highlight it and report to the Technical Manager.
9.1.9. The borehole shall be drilled at every location as per the approved layout by using a borehole machine. The diameter of the borehole shall be 100 to 150 mm. The depth of the borehole shall be at least 2 meters below the summer water table.
9.1.10. The inspection pit shall be constructed as per the details shown on the drawing. PVC ducts of 100 to 150 mm shall be provided approximately 1-2 meters long at the Earth Pit end to prevent cave-in of the soil in the borehole.
9.1.11. After the Earth Rods along with a suitable cupboard are installed, as per the approved materials, the piece of the PVC duct shall be removed. The area around the earth rod shall be filled with soil. A concrete Earth pit shall be installed as per the approved drawings.
9.1.12. After installation of the earth rod and successful testing, the down conductors shall be connected to the earth rod using clamps.
9.1.13. Earth electrode housed in concert chamber complete with removable concrete cover with recessed lifting hook for inspection.
9.1.14. Ensure that the installation is carried out to meet the required parameters. A request for inspection shall be raised after completion.
9.2. Earthing and Bonding System
9.2.1 Boreholes shall be drilled at every location as per the approved layout by using a borehole machine. The diameter of the borehole shall be 100 to 150 mm. The depth of the borehole shall be at least 2 meters below the summer water table as per the STATE/Country Code of Practices/Regulations.
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