Method Statement Title: Installation of G.I. & PVC Conduiting on Surface
1.0 Scope :
- This method statement details the method of installation of G.I. Conduit and PVC Conduit on surface.
2.0 Material :
- All materials shall be as per approved material submittals.
2.2 Sizes of Conduits to be used are 20mm dia to 50mm dia.
3.0 Applicable Location :
- Tower E1, E2, E3, W1, W2, W3, Podium and Villas
- G.I. Conduits are used particularly in all exposed to view area, such as plant room, lift motor rooms, sub-stations and outside buildings, partially open ceilings, any place which is likely to be damp or exposed to outside ambient temperature.
3.3 PVC Conduits are used only false ceiling areas.
4.0 Method :
- Storage.
4.1.1 Conduit shall be lowered not dropped to the ground.
- Conduit shall be given proper support at all the times and shall be stacked on flat surface. Manufacturer’s instructions shall be followed as applicable.
- Timber supports shall be placed at an interval of one metre.
4.1.4 Conduits shall be protected from direct sunlight and moisture to avoid deterioration.
4.1.5. Conduits shall be stored with proper end caps.
4.1.6 Conduits shall be stacked size wise.
4.2 Installation :
- Shifting of materials shall be done by tower crane or sufficient manpower shall be deployed. All necessary safety precautions as per established procedure shall be implemented during shifting and installation.
- The routes for the surface Conduits will be marked based on the approved shop drawings and coordinated with other services at site.
- Prior to erection, all burrs and sharp edges shall be removed from the conduit with reamer together with any dirt, oil or paint, which may be present.
- Standard length of conduits shall be cut to the required length.
- For G.I. Conduits threading shall be done using a threading machine and correct size die-set. Threads will be kept to a minimum when showing from couplings and boxes.
- Cold Galvanizing paint is applied to the thread part of G.I. Conduit just before fixing.
- Where required conduits of size 20mm and 25mm shall be bent to the required radius using manual bending machines. Manufactured bends are used for conduits size 32 mm and 50mm.
4.2.8 Conduits are fixed to the building fabric by means of distance bars saddle with appropriate metal screws and plugs. A space of 3mm minimum shall be maintained between conduit and the building surface.
Check all mechanical connections are internally smooth for pulling wiring in no burrs or sharp edge will be allowed.
4.2.9 The route of this steel conduits are restricted to horizontal and vertical runs except for the areas where approved to follow the line of an architecture.
- Spacer bars are fixed in regular interval not exceeding 1.2m and the distance from either side of any box or bend to the nearest spacer bar shall not be more than 150mm.
4.2.11 Ensure the Conduit installations are in straight line.
4.2.12 Conduits shall be fixed so that no water enters, if it is not practicable a 3mm hole is drilled at the lowest point of the conduit to drain the water out.
- All terminal boxes are marked on the appropriate location (i.e. wall or ceiling) as per approved shop drawing and fixed with metal screws and plugs. Suitable braze bushes are used where conduit enters the boxes to avoid any damage to the wires.
4.2.14 Wherever necessary draw wires shall be pulled into conduit runs and kept at pull boxes for future use.
4.2.15 Any rusting of steel conduits occurred during construction shall be removed.
4.2.16 Inspection shall be offered for ETA QA verification.
5.0 Safety :
All safety precautions shall be followed as per established project safety plan and procedure.
6.0 Records :
6.1 Work Inspection Request (WIR) duly signed-off by NMX and Consultant.