Technical Specification for A.C. Single Phase, 2 Wire ... - WBSEDCL

Sl.No.ParticularMin. Requirement as per Specification ofWBSEDCLAs offered(ii)Type of push buttonSpring loaded/ Rubber elastomer pushbutton to be provided on top cover of meterto read parameters16.Reading on power offconditionMeter shall be able to display readingduring power outage through the pushbutton provided on the meter with facility forhands free meter reading with auto-offprovisions.17. a) Battery of Real time clock(i) It shall be Lithium/Lithium-ion batteryhaving at least 10 years of life(ii) The drift in time shall not exceed +/- 3minutes per yearb) Battery for Display duringpower off conditionIt shall be Lithium / Lithium-ion/ NiMhbattery having at least 10 years of life18. Fixing/sealing arrangement(i) Fixing of meter(ii) Sealing of meter cover toBase3 fixing holes (one at top & two at bottomunder terminal block). The top fixing screwshall not be accessible after meter is fixedto meter box base.At least, two sealing provision/screws shallbe provided for proper fixing of the metercover so that access to the working partshall not be possible without breaking theseal. Necessary provision shall be kept forfixing the utility seal also.19.20.Type of hinged un-detachableterminal coverPerformance of meter intamper conditions(i) Phase-neutral interchanged(ii) Main & load wire areinterchanged(iii) Load is not terminatedback to meter & current isdrawn through local earth fullyor partiallyThe meter cover shall be permanently fixedto the base by ultrasonic welding or anyother technology which is equally or moreefficacious so that cover cannot be openedwithout breaking, i.e. the meter should bebreak to open type.Meter should have an indication in itsdisplay if top cover is removed.Terminal cover shall be either hinged/ nonhingedShould work within specified accuracy----do-------do----