Development Authority

Development Authority has published Installation Of Lightning Prevention System At Gbda Administrative Building- SCHEDULE OF RATES FOREARTHING INSTALLATIONS.Soil Excavation.Excavation of soil FORinstallation of Earth Electrode and filling & ramming. FOR For Soft Soil. 2 Earthing with Copper plate (610x610x3mm size) having weightof 9.84 Kg and 1 No. 25x5mm Copper strip (3.20 mt long) & 1 no. 6 sqmm PVC insulated stranded Copper wire (4 Mt long) incl. S & F 15 mm dia GI pipe (ISI-Medium) protection (4 mt. long) to be fillied with bitumen, partly under the ground level & partly above ground level to an average depth of 3.65 Mts. below the ground level and restoring the surface duly rammed incl. providing 3.0 mt long, 25 mm dia GI pipe (ISI-Medium) for periodic treatment, incl. providing masonery enclosure on the top of the earth electrode of overall size 86.36x86.36x46cm deep (below Ground level) complete with cemented brick work (1:6) of 25 cm width, duly plastered with cement morter (inside) CI hinged inspection cover of size 36.56x35.56cm with locking arrangement, GI reducer and treatment of soil by using salt & charcoal or coke for plate electrode 3 S & F Lightning conductor Air-terminals made of 15 mm dia 1500 mm long GI pipe (ISI Medium) having five prongs of 4 SWG GI (Hot Dip) wire at top with 85 mm dia 6 mm thick GI base plate at bottom incl. necessary holes etc. duly grouted on the parapet etc.in CC mortar (4:2:1) 4 S & F of 4 SWG GI (Hot Dip) wire on wall for the lightning conductor as required (for vertical run) with GI Staples (40 mm long) spaced not exceeding 1 Mtr. apart incl. mending good the damages to building works (excluding hire charges of scaffolding) 5 S & F of 4 SWG GI (Hot Dip) wire on Parapet/Roof/Plinth/ Surface of wall for lightning conductor as required (for Horizontalruns) with 40 mm long GI Staples spaced not exceeding 1300 mm apart incl. mending good all the damages to the buildingworks 6 Cutting cornices/ steps etc. including cutting recess in buildings etc. & supply & fixing 15 mm bore (ISI-Medium) GI pipe protection as below and mending good damages to the building works: (a) Length upto 0.5 Mtr 7 Supply & Fixing of Testing Joints by 20 mm x 3 mm thick GI (Hot Dip) strip 125 mm long grouted on wall having clearance of 6 mm from wall for making connection with thimbles at the end of 7/10 SWG GI (Hot Dip) stranded Wire and 4 SWG GI (Hot Dip) wire of vertical conductor and conductor from earth electrode complete with S & F thimbles, GI bolts, nuts, check-nuts, spring washers etc. as required 8 SCHEDULE OF RATES FOR INSTALLATION OF LIGHTNING CONDUCTOR 7. Hiring charges FORscaffolding arrangement including dismantling at the end of work and carriage, FOR LC installation, per storey of building per vertical run 9 PVC casing-capping of size 25x12mm 10 Making soldered joints between conductors, conductors and air terminals for 4 SWG GI (Hot Dip) wire incl. supply of jointing materials and painting with 2 (two) coats of bituminous paint . Last date of submission for this tender is 2025-09-19. This is a Lightening Protection Device tender in Sagar, West Bengal