WBPWD/EE/N24/EL/e-NIQ- 174/25-26

Barasat Govt. School: S & F Lightning Conductor Air Terminal made of 20 mm dia 1000 mm long GI pipe (ISI Medium) having five discharge prongs of 4 SWG GI (Hot Dip) wire at top duly soldered/ welded with 7/16 stranded GI (Hot Dip) wire and 85 mm dia 6 mm thick GI base plate at bottom incl. necessary holes etc. complete duly grouted on the parapet etc. in CC mortar ( 4:2:1), including thimble joints of 7/16 SWG wire and (25 x 6) mm GI strip with SS nuts, bolts & washers. (P-J-2/Item-14 + NS)

Supply & fixing of 25 mm x 6 mm thick GI (Hot Dip) flat / strips for Horizontal & Vertical run on wall / floor with GI shaddles as required including drilling holes, bolts, nuts, washers, etc./ and mending good the damages to building works . (Page : G-3/Item-5d).

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: (P:J-1/Item-4) i) Length upto 0.5 Mtr

ii) Length above 0.5 Mtr

Hiring charges for scaffolding arrangement including dismantling at the end of work and carriage, for LC installation, per storey of building per vertical run. (P : J-1/Item-7)

Supply & Fixing of Testing Joints by 25 mm x 6 mm thick GI (Hot Dip) strip 125 mm long on wall after making suitable arrangement to establish a clearance of 50mm from wall for making junction connection with vertical conductor and conductor from earth electrode complete with S & F GI bolts, nuts, check-nuts, spring washers etc. as required. (Rate arrived from G.S. Page :J-2/Item-13)

Earthing with 65 mm dia GI pipe (TATA-Medium) 3.0 Mts. long with welded 2 nos. half circle bracket made of GI strip (65 x 8) mm. with two holes on extended portion of the each strip of length min. 250 mm , and 1 No. 50 mm x 6 mm galvanized (Hot Dip) steel strip (4 Mts. long), 20 mm dia x 125 mm long galvanized bolt, double nuts, double washers including finishing both ends by making holes etc. and S & F 65 mm dia GI pipe (ISI-Medium) protection (3 Mts. long) to be filled with bitumen partly under the ground level and partly above ground level to an average depth of 3.65 Mts. (Rate arrived from G.S. Page : G-1/Item-2d)

Excavation of soil for installation of Earth Electrode and filling & ramming as to GS. (For morum soil)(Page : G-1/Item-1b) .

Supply, Laying & Fixing of 50mm x 6mm galvanized (Hot Dip) steel strip in underground trench for interconnection between the Earth Points by joining (As per item no 11). (Rate arrived from G.S. Page : K-3/Item -134 + G-1/Item-1a.)

Jointing for Horijontal & vertical run of GI strip through welded joint of (25 x 6) mm or (50 x 6) mm GI Strip to Lap joints/ 'T' joints, etc. and painting the joints with 2 (two) coats of bituminous paint. (NS)