8
2.2 Operating conditions
The meter is connected to a single-phase AC circuit and is designed for indoor mounting with following
operating conditions:
– ambient temperature from – 45 to + 70°С;
– relative humidity (30-98) %;
– atmospheric pressure 70 to 106,7 kPa (537-800 mm of mercury);
– measuring network frequency (50±2,5) Hz;
– measuring network current and voltage waveform – sinusoidal with non-sinusoidal ratio not more than 8 %.
2.3 Environmental conditions
2.3.1 In terms of resistance to the climatic influence the meter belongs to group 4 according to GOST 22261-94,
with expanded temperature and humidity range, meets T-design of category 3 according to GOST 15150-69.
2.3.2 The meter is protected against dust and water. The protection rate is IР51 according to GOST 14254-96.
2.3.3 The meter is resistant to single impacts and vibration according to GOST 31818.11-2012.
2.4 Specifications
2.4.1 The meters meet the requirements of IEC 62052-11:2003 and IEC 62053-21:2003 in terms of active
energy measuring.
2.4.2 The basic specifications are given in Table 2.1.
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