Sch 1E para 3 MPEs
The effects of the various measurands and influence quantities (a, b, c,…) are evaluated separately, all other measurands and influence quantities being kept relatively constant at their reference values. The error of measurement, that shall not exceed the MPE stated in Table 2, is calculated as: When the meter is operating under varying-load current, the percentage errors shall not exceed the limits given in Table 2. – 10 °C … + 5 °C or + 30 °C … + 40 °C – 25 °C … – 10 °C or + 40 °C … + 55 °C – 40 °C … – 25 °C or + 55 °C … + 70 °C Single phase meter; polyphase meter if operating with balanced loads Polyphase meter if operating with single phase load I tr ≤ I < I max , see exception below When a meter operates in different temperature ranges the relevant MPE values shall apply. The meter shall not exploit the MPEs or systematically favour any party.