SPECIAL REPAIRS/ REPLACEMENT OF LIGHTNING PROTECTION SYSTEM AND EQUIPMENT EARTHING AT CERTAIN LOCATIONS AT AFA HYDERABAD.

Dynasphere lightning conductor stainless steel as per IEC 61024. The Air terminal shall be placed using the " Collection Volume Method / Field Intensification Method" placement methodology as specified in IEEE‐998.Make ERICO Cat Part No: D/SMKIVSS or techno-commercially equivalent of SEIMENS/ HARGER/ CAPE ELECTRIC complete all as specified and as directed b& to the entire satisfaction of the Engr-in-Charge. Brief features/ specifications of the same is as follows: aa) Impulse Tested, atleast for 40 KA both +ve and -ve , 8/20 micro-second, resistance between the terminal tip and the sphere should be minimum 10 MΩ before and after the test. ab) Free from Corona effect. ac) Trigger an upward streamer when there is a downward stream. ad) The dome must be insulated from the rod but connected to ground via a dynamic variable impedance. ae) The center grounded electrode tip shall be at least 20mm diameter. af) The terminal must be isolated from the structure using an insulated support mast making an isolated lightning protection system. "ag) Air terminal should not be dependent upon batteries or external power supplies for any part of its operation." ah) Streamer Emission should not be ESE type.

5m elevation pole made of AL(aluminium) Mast with a dia of 60mm with a M20 thread at the top to fix the unit. Make ERICO Cat Part No: ALU-5M or techno-commercially equivalent of SEIMENS/ HARGER/ CAPE ELECTRIC complete all as specified and as directed & to the entire satisfaction of the Engr-in-Charge.

Air terminal Adaptor made up of Brass/SS for the connectivity of Air terminal & the Mast, with suitable terminal clamp made up of SS. Make ERICO Cat Part No: INTCPT-ADM3/4UNC or techno-commercially equivalent of SEIMENS/ HARGER/ CAPE ELECTRIC complete all as specified and as directed & to the entire satisfaction of the Engr-in-Charge

Base/ side Bracket to hold the Air terminal mast with suitable fixing accessories, Guy wire support and all required fixing equipment's. Make ERICO Cat Part No: IGUYKIT4MGRIP or techno-commercially equivalent of SEIMENS/ HARGER/ CAPE ELECTRIC complete all as specified and as directed & to the entire satisfaction of the Engr-in-Charge

S & F 8 mm Copper Bonded Steel Round Conductor, minimum copper bonding shall be 254 microns having continuous coin form, the conductor core shall consist of low-carbon steel grade for improved flexibility. The copper surface of the conductor should provide high conductivity and corrosion resistance properties, well‐suited as a lightning protection conductor in accordance with IEC 62305‐3 Edition 2.0 standard. The conductor should be certified by UL & IEC 62561-1. The life of CSBS Conductor should be 30 Years. The Cat Part Number & compliance markings should be stamped directly on the conductor at every meter. Make ERICO Cat Part No: CBSC - 8MM or techno-commercially equivalent of SEIMENS/ HARGER/ CAPE ELECTRICcomplete all as specified and as directed & to the entire satisfaction of the Engr-in-Charge.

S & F Clamp Holder made up of 304 grade SS with SS bolt and nut at every 1 m distance of round conductor. The clamp should be suitable for double run of Copper bonded Steel round conductor size of 8-mm. Make ERICO Cat Part No: CBSC-8 SADDLE or techno-commercially equivalent of SEIMENS/ HARGER/ CAPE ELECTRIC complete all as specified and as directed & to the entire satisfaction of the Engr-in-Charge

Copper Bonded Steel Earth Rod of size 5 feet x 5/8 inch diameter of 4 Nos, earthing system required minimum excavation of 100 mm width x 150 mm depth x 5000 mm length in square pattern Mat Radials which should be 10 meters apart, Auger 4 Nos hole of diameter 4 inch and 5 feet depth in the soil, placing the Earth rods in to the augured hole, hammering the rods to 1 feet depth, Readymade FRP Heavy duty earth chamber (450 mm x 450 mm), Top Cover with minimum 25 ton load bearing capacity, removing excavated material. Make ERICO Cat Part No: CODE74071020 or techno-commercially equivalent of SEIMENS/ HARGER/ CAPE ELECTRIC complete all as specified and as directed & to the entire satisfaction of the Engr-in-Charge. Brief features/ specifications of CBSE Rod is as follows : aa) The outer surface must be molecularly bonded with uniform layer of 250 micron Copper, 99.9% pure electrolytic copper coating. ab) Nickel interface must be provided between the copper and steel to avoid the galvanic corrosion. ac) Must be capable of withstanding fusing current of 20 KA. ad) Earth rod must be in compliance with IEC 62305- 2. ae) Tensile strength greater than 80000 PSI on 12 mm. af) High resistance to corrosion.

Ground Enhancement Material (GEM) , Per Bag -11.33 Kgs, Conforming to IEC 62561-7 Standard, Premixing the GEM into slurry form using water (not more than 5 L to 6 L per bag), Pouring the GEM mixture in the augured hole and filling. Make ERICO Cat Part No: GEM 25A- 25-1lb or techno-commercially equivalent of SEIMENS/ HARGER/ CAPE ELECTRIC complete all as specified and as directed & to the entire satisfaction of the Engr-in-Charge. Brief features/ specifications of the same is as follows: ba) Must be carbon based superior conductive material. bb) Resistivity must be less than 2 Ω-cm. bc) Must not cause corrosion to copper when in contact. bd) Must not expand or experience any shrinkage once set. be) Must not depend on the continuous presence of water / moisture / salt to maintain its conductivity bf) Must not decompose or leach out with time. bg) Must not contain hazardous chemicals as per IEC 62561-7 standard. bh) Flexural and possess compressive strength as per relevant standard. bj) Sulphur content must be less than 2%.