12 13
2.6 Ambient conditions
2.6.1 In terms of resistance to climatic influences, the meter belongs to group 4 in accordance with
GOST 22261-94, with an extended range of temperature and humidity, satisfying version T category 3 in
accordance with GOST 15150-69.
In terms of resistance to mechanical impacts, the meter belongs to group 2 according to GOST 22261-94.
2.6.2 In terms of protection against ingress of dust, water and external solid objects, the meter case corresponds
to the degree of protection IP54 according to IEC 60529:2013. In case of outdoor use, the meter must be installed
inside a protective box, protecting it from direct exposure to sunlight, precipitation and not allowing the temperature
of the air surrounding the meter to rise above plus 70 ° C.
2.6.3 The meter is resistant against single impacts with a maximum acceleration of 300 m/s
2
.
2.6.4 The meter is resistant to vibrations in the frequency range (10-150) Hz.
2.6.5 The meter body withstands impact of spring hammer blows with kinetic energy (0.20±0.02) J applied to
the external surfaces of the body, including the windows, and to the lid of the clamps.
2.6.6 Parts and components of the meter that are designed for operation in areas with a tropical climate, in terms
of resistance to the effects of mold fungi, comply with the requirements of GOST 9.048-89.
The permissible growth of fungi amounts up to 3 points according to GOST 9.048-89.
2.7 Technical specifications
2.7.1 The meters meet the requirements of IEC 62052-11:2003, IEC 62053-21:2003 (for class 1),
IEC 62053-22:2003 (for classes 0.2S and 0.5S) in terms of measuring active energy, and IEC 62053-23:2003 in
terms of measuring reactive energy.
2.7.2 The technical specifications given with tolerances or limit values are considered guaranteed. Values without
tolerances are for reference only.
Main technical specifications are given in Table 2.4.
Limits of the permissible errors of the measured values are given in Annex A.
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