Article 4.7.2B : How to calculate Accuracy of iELR Meter ?
Accuracy is claimed only for FULL SCALE reading in the IELR Meter- Meaning, Accuracy limits are to be only calculated for
12 Amps - in 300mA to 12A Meter
30 Amps- in 30mA to 30A Meter.(Latest Model)
The accuracy class is 2% for all ranges of CBCT & iELR
Example-
Calculation-
Meter Full Scale- 12A
Accuracy class- +/- 2% of FS
Current Limit will be 240 mA. (2% of FS).
if Trip Current is set at 1000 mA in the Meter, then trip can occur in between the range of 760 mA to 1240 mA -
Note- Please Consider 300 mA as starting sensing current in the Meter)