Method Statement Title: Installation of Lightning Protection system
1.0 Scope :
- This method statement details the method for installation of lightning protection system.
2.0 Material :
Material used for the system is as per BS 6651 : 1992.
3.0 Applicable locations :
Roof, Basement, and ground level network.
4.0 Method :
- Storage :
Material shall be stored in a covered/dry space at all the time to avoid corrosion.
4.2 Preparation :
- As per approved shop drawing/s identify location of rebars / dedicated rods to be installed as down conductors. Co-ordinate with Main Contractor for installation of dedicated rods and rebar clamps before shuttering for the columns / wall is in place.
- Clean the area of clamp to be fixed with wire brush / emery paper to remove rust on rebar, if any.
4.3 Installation :
- The following method shall be followed at all locations, identified as per shop drawing.
- The dedicated rebar is selected from the pile cap and the cable is clamped with the rebar by CR730 clamp and connected to the dedicated rebar of the selected column as per approved shop drawing.
- Fix G.I. Box 160 x 80 x 35 at 500mm from SSL (for testing purpose) on the column. The box shall be tied with reinforcement rod and the box cover will be flush with the finish wall.
- The dedicated rebars of the column as per shop drawing shall be connected to a 70sq.mm PVC cable using CR 705 Furse clamp for the extension till it reaches the roof.
- Expanded polystyrene shall be applied to seal the hole within the concealed disconnect link box and tied with steel binding wire to prevent concrete / cement entering into the box.
- Prior to concreting, earth continuity between reinforcement rods and dedicated rods shall be checked with a d.c. ohm meter. Also torque setting shall be checked at 40Nm.
- In each tower E1, E2, E3, W1, W2 & W3 final test sheet shall be offered to Consultant for witness and sign-off.
- Once rebar has reached upto the height as shown in the drawing for bonding, the work shall be co-ordinated with Main Contractor. This is applicable in locations as shown in design drawings.
- At roof G.I. box 160 x 80 x 35mm shall be fixed at 500mm from SSL with fixing of PC116 furse earth point with pre-welded joint. The box shall be tied with reinforcement rod and box cover shall be flush with finish wall 25 x 3 copper tape run on roof perimeter as shown in shop drawing bonded with non ferrous bonding point. All mechanical i.e. AHU’s, pole structure, petal structure etc. shall be bonded with 25 x 3 copper tape.
- 25 x 3 copper tape shall be fixed on top of parapet wall at 1m centres as shown in shop draw2ing with Non-ferrous bonding point.
4.3.11 Connection between down conductor and earth pits
a. Blinding, water proofing and 50mm (min) protective screed needs to be provided by Civil contractor.
b. Refer attached sketch showing sectional view of the earth connection and its assembly.
- Inspection shall be offered for QC verification in stages.
- Inspection request shall be raised at least 24 hours in advance for Consultant’s inspection, prior to concrete pour / cover-up work.
- Final inspection shall be carried out collecting all the data from previous inspection requests and finally verified for the anticipated results.
- Records :
5.1 Inspection request duly signed-off NMX and Consultant.
- Attachments :
6.1 Typical installation details – Detail A – Sheet 1 Detail B – Sheet 2
