Improvement to Earthing Arrangements and lightening protection at vulnerable and priority stations/ locations As per the latest TAN of RDSO

Item Breakup - SOR-SOR ITEMS

22756.39 as per RDSO Spec. No. SPN/165/ 2023, Version 4.0 Amdt.1 or latest (Lightning and Transient surge protection for power line). The system shall have stage1 (class B) and stage 2 (class C) type against Lightning electromagnetic Impulse configuration. The protection of Type 1 and 2 against Lightning electromagnetic Impulse (LEMP) and other high surge, shall be provided at the incoming of the power line at the stations, LC gates before the power equipment's as per the instructions of Engineer in-charge at site. Supply of surge protection with Potential free contacts shall be of approved make like OBO, DEHN, PHOENIX, LPT or better make. All other miscellaneous materials required for the work shall be supplied by the contractor. (as per Technical Specification enclosed)

6328.80 Surge Protection Device for 24V DC/48V DC (spark gap type), with Potential Free contacts and installed as per the instructions of the Engineer in charge at site ( OBO, DEHN, PHOENIX, LPI, ZOTUP, HAKEL or better make).All o t h e r miscellaneous materials required for installation shall b e supplied b y the contractor.

6830.72 of Operating Voltage of 110V AC/DC with Potential Free contacts and installed as per the instructions o f t h e Engineer in charge a t s i t e ( O B O , DEHN, PHOENIX, LPI, ZOTUP, HAKEL or better make). All o t h e r m iscellane o us m a t e r i a l s required for installation shall be supplied by the contractor.

1707.55 No.SG/CN/02/13 and earthing of metallic sheath and armour of all cables in all apparatus cases, relay room, equipment room, SM's room for block and control, and earthing of all equipments in apparatus cases, power room, relay rack, cable termination rack, control panel, signals, lever frames with MS flat 35mm X 6mm/19c cable (MS flat for closer by areas and MS flat/19c cable combination for farther areas) as per the instructions of Railway representative at site. The work includes painting of earth resistance value on the earth pit. (Supply of 19C cable is not covered in the scope of this schedule). [MS flat for earthing 35mm X 6mm, cement, GI earth electrodes, common salt, charcoal, country bricks, M sand, soldering materials and all other miscellaneous materials required for the work shall be supplied by the Contractor].

1370.66 1050x25x3mm a s given i n enclosed drawing to Box connect a l l c a b l e armours to earth point with suitable nuts/bolts as given below. A) G I nuts/bolts o f s i z e 8x25mm w i t h Two flat a n d o n e spring washer of 23set. B) GI nuts/bolts o f size 12x40mm with two flat and one spring washer of 02set as per site incharge" TRICHCHIRAPPALLI DIVISION-S AND T/SOUTHERN RLY

846.75 550x25x3mm a s g i v e n i n enclosed drawing to Box connect a l l c a b l e armours to earth point with suitable nuts/bolts as given below. A) G I nuts/bolts o f s i z e 8x25mm w i t h Two flat a n d o n e spring washer of 23set. B) GI nuts/bolts o f size 12x40mm with two flat and one spring washer of 02set as per site incharge"

9752.74 Protection Device. This includes transportation of materials t o site. Installation t o b e carried o u t as p e r the direction o f Railway Engineer. Necessary copper wire for Power Wiring and connecting the earth t o b e supplied a s part o f the schedule. All o t h e r m iscellane o us m a t e r i a l s required for installation shall be supplied by the contractor."

11.00 120729.41 testing o f surge protective devices (SPD). It shall indicate the health status of GDT/ MOV based SPD of voltage range upto 1000V. It shall indicate the status of SPD by measuring its electrical parameters.

11.00 500V/1000 mega ohm battery operated with all c o m p l e t e accessories, a s per Technical specification

11.00 Technical specification

50.00 gears by deputation of Helpers/Unskilled Labour for Days executing additional S&T portion o f the works. The w o r k can involve fixing, releasing, dismantling, replacement,excavation, clearing of vegetation, loading and unloadingof material and assisting skilled persons etc as per instruction of Railway representative.

50.00 b y deputation of Fitter/Wireman/Painter/Welder/ Days Mason/Cable Jointer (Skilled Labour or Technician ) etc., for executing additional S&T portion of works. The work can involve fixing, releasing, dismantling, replacement, painting or alteration o f various signallilng assets or parts, termination o f cables, minor patch work on damages at location box, Plastering, Concreting brick work, wiring alterations, cable jointing e t c a s p e r instruction of Railway representatives at size.

55.00 machineries for regarding and levelling the formation, dismantling a n y infringing structures, clearing and removing debris etc., with all leads and lifts etc., complete and a s p e r t h e instruction of Railway representative at site. Total 13967656.44