supply of ac static watt hour meter.ac static watt hour meter.,ac static watt hour meter 10-60 ampere with box reference voltage : 240 volts, numbe r of phases: single phase basis current ib: 10 amp. rated maximum current (imax) as % of ib: 600 % accuracy class -1, isi marking: yes, anti tampering features: yes ,battery backup for display: yes, cur rent transformer: no, with backlit lcd display for display of voltage, current , power factor, frequency , kwh etc. conforming to is: 13779(1999) with latest amendment, material used for moulded meter b ox base: transparent /grey/black of polycarbonate material. size of the box: 270 mm(l) x 230 mm(w) x 140 mm(thickness) dimension is approximately thickness of moulded sheet protection: ip 51. there should be sufficient clearance from bottom for easy wiring & the box should be suitable for housing th e meter, unbreakable, fire retardant & should be of good quality. the cover in closed condition must o verlapped in such a manner that no direct entry of access is possible & at least two sealing provisions/ screws shall be provided for proper fixing of the meter cover so that access to the working part shall n ot be possible without breaking the seal. is: 13779(1999) with latest [ warranty period: 30 months a fter the date of delivery ] ]