corrigendum - replacement of old vintage ht four pole structure with rmu inside ins virbahu and provision of deficient power supply for mi room p 57 at ins satavahana and building no p 12 at naval base under age em i of ge utility 1 visakhapatnam , dismantling old defective four pole structure complete including steel poles , cross arms etc complete and removing from site complete all as directed , supply , installation , testing & commissioning of 11 kv , 630a , 21ka/3sec , outdoor type , both sides extensible , internal arc 21ka for 1 sec for tank , floor mounted with internal copper bus bars , sf6 insulated , completely motorised , 6 way rmu consisting of 2 nos lbs as incomer & 4 nos 630a vcbs as outgoing with sacada compatable overload and eart fault protection relay ( ashidha / cspdr ) with air insulated metering module ( mfm for vcb feeders ) . all live parts , bus bars , lbss connections of rmu shall be enclosed in one sf6 tank to avoid multiple interconnections . sf6 tank shall be sealed for life robotically welded non magnetic and non ferrite stainless steel grade 304 of minimum 2 . 5 mm thick having ip67 degree of protection filled with sf6 gas as insulation with leakage rate less than 0 . 1% per year tested as per iec 62271-200 . manual welding or hermetic sealing of tank shall be not be accepted . , the unit shall have front cable entry for ease of installation and shall have site replaceable bushings for ease of troubleshooting during breakdown . rmu should be complete with all accessories such as terminal boots , vpis , cable supports , all front cable terminations , mechanical indications for load break switch on/off , manometer as per with iec standards 62271-200 , 60056 , 60129 , 60265 , 60298 , 60420 , 60529 and 60694 . altitude of installation up to 1000m as per iec 60120 . , note:- bushings bolted type top mounted outside the tank for connection of external bus bar . also , the outer enclosure shall cover the full length of the switchgear , to ensure ip3x+ip54 protection for cable boxes . the unit shall be internal arc proof 21ka for 1 se with aflr clasification . , tested and totally safe for human beings . the gas release & personnel safety from internal arc shall not depend on plinth design . the release of gas to be from the top of the unit , so that , even if the person is operating the unit , opening the cover , & there are personnels near the sides of the rmu/plinth , top release will ensure their safety . the hot gas release , in case of an internal arc , in no case should be from any side or bottom of the unit , as the same is unsafe for the operating personnel/pedestrian or general public . bidder shall provide type test report to prove compliance to the internal arc fault iac-aflr as per iec 62271-200 . internal arc testing shall be done with enclosure door in open condition , with switching devices in operation mode as per specified standard . complete all as directed of make : schneider / abb safe plus/ siemens . , note:-the rate quoted deemed to be inclusive of necessary earth , feeders snickering marking & foundation for installation of rmu all as per manufactures recommendations/ instructions . , supply and laying or fixing or passing through pipe or in cable ducts , 11000 volts grade xlpe insulated heavy duty ( earthed ) , screened , pvc bedded , galvanised steel strip or wire armoured , electric power cables ( heavy duty ) with aluminium conductor 185 sq mm 3 core size including dismantling old one . make : polycab/havells/finolex . , supply and fix cable jointing kit for 11 kv grade cable for outdoor terimination heat shrink type joint complete with jointing material and accessories suitable for 3 core xlpe armoured al conducter cable of size 185 sq mm . make: birla 3m/ raychem/ denson , supply and fix cable jointing kit for 11 kv grade cable for indoor terimination heat shrink type joint complete with jointing material and accessories suitable for 3 core xlpe armoured al conducter cable of size 185 sq mm . make: birla 3m/ raychem/ denson , excavating in trenches n . exc . 1 . 5m wide and n . exc . 1 . 5m in depth for foundation , trenches for laying cables/ pipe line etc . and getting out in soft/loose soil , removing excavated materials to a distance n . exc . 50m and depositing where directed at a level n . exc 1 . 50m above the starting point . , returning , filling in including spreading leveling watering and well ramming in layers not exc 25cm in any type of soil . , supply and spreading clean dry sand for cable cushioning in trenches complete all as specified and as directed . ( note: punned thickness only shall be measured ) , cutting & cleaning of bushes/small plants , at sub stn incl surface dressing and removing debris to distance not exc 50 mtr complete , hardcore of guage exc 63mm but n exc . 100 mm , deposited , spread and levelled in layers n exc . 15 cm thick , watered and rolled/rammed to a true surface complete all as directed , hardcore of gauge n exc . 63 mm , deposited , spread and levelled in layers n exc . 15 cm thick , watered and rammed to a true surface complete all as directed , s&f ms angles , bars flats etc , as in supports for stiffening of fencing , wall ties , hold fasts , clamps and similar small articles confirming to fe 410-0 or fe 310-0 complete , preparation of new or previously untreated steel surfaces of any description , over 10 cm width or grith , not otherwise described and appling two coats of synthetic enamel paint over a coat of zinc chromer primer complete . , supply and laying un-reinforced pre cast cover of size ( 300mmx180mmx40mm ) laid along alignment of cable as protection to cable in trenches complete all as specified and directed by engineer-in-charge , supply and fix or laid in road crossing/ fixed to poles , gi pipe of 100 mm size light grade for protection of cable complete all as directed . make: tata / jindal , m &l plain cement concrete 1:4:8 type c2 ( using 40 mm aggregrate ) as in foundations filling mass concrete complete all as specified and directed , m &l for cement concrete pcc 1:2:4 type b1 ( using 20 mm aggregrate ) as coping of poles complete all as specified and directed , supply and fix or laid in road crossing/ fixed to poles , gi pipe of 80 mm size light grade for protection of cable complete all as directed make: tata / jindal , making trench through horizontal earth boaring for road/ foot path /hard standing/culvert etc for inserting gi protection pipe for drawing of cable and complete all as directed . , cutting trench through road/ wall to a width of 20cm and depth of 30cm for inserting gi protection pipe for drawing cable and filling back the trench with pcc 1:3:6 type c1 complete all as directed . , m&l for earthing complete with galvanised steel earthplate of size 60x60cmx6 . 3mm thick electrode and 32x6mm gi strip as earth lead , buried directly in ground ( earth pit not less than 2 . 25m deep below ground level ) with top edge of the plate not less than 1 . 5m below ground level , connected to 32x6mm earth strip by means of nuts , bolts , check nuts and washers of gi all as shown in electrical plate no . 5 of ssr part-i , connected to earth test terminal point all as specified or as indicated including testing on completion ( rates inclusive of neccessary excavation in any type of soil , earth work , pcc pit , ci cover , funnel with watering pipe , suitable size of light grade gi protection pipe for earth strip in ground etc . all as required at site for complete earthing ) , supply& fix aluminium strip 32 mmx 6 mm complete with saddles and fixing screws for fitting the strip , supply and laying sub class b bricks of old size ( 23x11x7cm ) laid along alignment of cable as protection to cable in trenches complete all as specified and directed by engi