IEC 62052-11:2020 pdf download – Electricity metering equipment – General requirements, tests and test conditions – Part 11: Metering equipment.
5 Construction requirements
5.1 General
The meter shall comply with the safety requirements coverea in C
The construction safety requirements for detached indicating displays are covered in
IEC 62052-31:2015, 13.1 c).
All parts which are subject to corrosion under normal working conditions shall be protected effectively. Any protective coating shall not be liable to damage by ordinary handling nor damage due to exposure to air, under normal working conditions.
The meter case shall be so constructed and arranged that any non-permanent deformation cannot prevent the satisfactory operation of the meter. In case of meters with detached indicating displays, this requirement applies also to the enclosure of the detached indicating display.
The meter cover shall not be removable without the use of a tool.
The mechanical strength of the meter shall be tested with the tests specified in 5.2.
NOTE 1 For meters for special use in corrosive atmospheres, additional mechanical requirements are subject to an agreement between the manufacturer and the purchaser (for example salt mist test according to IEC 60068-2-1 1),
If an electricity meter is designed to be installed in a specified matching socket or a rack, then the mechanical requirements apply to, and the mechanical tests shall be performed on, the meter installed in its specified matching socket or rack, as per the manufacturer’s instructions.
If an electricity meter is designed to be installed with a specified detached indicating display, then the mechanical requirements apply to, and the mechanical tests shall be performed on, the meter and its specified detached indicating display.
If an electricity meter is designed to be installed with specified LPITs, then the mechanical requirements apply to, and the mechanical tests shall be performed on, the meter with its specified LPITs connected.
Electricity meters designed to operate only with data communication interfaces and without any indicating display may be also evaluated using this document. However, requirements specified for indicating displays, integrated or detached, shall not apply to such meters.
NOTE 2 National or regional requirements often require an indicating display on meters intended for legal metrology
appl lcations
5.2 Mechanical tests
5.2.1 Shock test
The test shall be carried out according to lEG 60068-2-27: 2008, under the following conditions:
a) meter in non-operating condition, without the packing;
b) half-sine pulse;
c) peak acceleration: 30 g (300 mIs2);
d) duration of the pulse: 18 ms.
After the test, the meter shall show no damage or change of the information and shall operate correctly in accordance with the requirements of the relevant standard.
5.2.2 Vibration test . The test shall be carried out according to IEC 60068-2-6: 2007, under the following conditions: a) meter in non-operating condition, without the packing; b) frequency range: 10 Hz to 150 Hz; c) transition frequency: 60 Hz; d) f< 60 Hz, constant amplitude of movement 0,075 mm; e) f> 60 Hz, constant acceleration 9,8 m/s2 (1 9); f) single point control; g) number of sweep cycles per axis: 10. NOTE 10 sweep cycles = 75 min. After the test, the meter shall show no damage or change of the information and shall operate correctly in accordance with the requirements of the relevant standard. 5.3 Window If the cover is not transparent, one or more windows shall be provided for reading the indicating display and observation of the operation indicator. These windows shall be of transparent material which cannot be removed undamaged without breaking the seal(s). This requirement also applies to detached indicating displays. 5.4 Terminals – Terminal block(s) – Protective conductor terminal The material of which the terminal block is made shall be capable of passing the tests given in 10.5.2 of IEC 62052-31:2015. This requirement applies to terminals of combined current and voltage circuits of directly connected meters, terminals of voltage circuits of transformer operated meters, terminals of current circuits of transformer operated meters, and terminals of auxiliary power supply circuits. The protective conductor terminal, if present, shall meet the requirements given in 6.5.2.3 of IEC 62052-31:2015.