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Agency (an Agency can be National, International, or a Non-Government Organization or NGO):
International Electrotechnical Commission
IEC 62052-31:2015 - Start year: 2015
Location: Global - Global


Electricity metering equipment (AC) - General requirements, tests and test conditions - Part 31: Product safety requirements and tests


This part of IEC 62052 specifies product safety requirements for equipment for electrical energy measurement and control.

NOTE 1 For other requirements, see the relevant standards.

This International Standard applies to newly manufactured metering equipment designed to measure and control electrical energy on 50 Hz or 60 Hz networks with a voltage up to 600 V, where all functional elements, including add-on modules are enclosed in or form a single case.

NOTE 2 The voltage mentioned above is the voltage line-to -neutral derived from nominal voltages. See Table 7.

This International Standard also applies to metering equipment containing supply and load control switches, but only those which are electromechanical in operation.

NOTE 3 For components and sub-assemblies, see Clause 13.

When such equipment is designed to be installed in a specified matching socket, then the requirements apply to , and the tests shall be performed on, equipment installed in its specified matching socket. However, requirements for sockets and inserting / removing the meters from the socket are outside the scope of this standard.

This International Standard is also applicable to auxiliary input and output circuits.

NOTE 4 Examples are impulse inputs and outputs, control inputs and outputs, circuits for meter data exchange.In this standard distinction is made between:

• electromechanical meters, static meters and equipment for tariff and load control;

• direct connected, current transformer operated, voltage and current transformer operated meters;

• protective class I and protective class II equipment;

• wall or cabinet mounted, rack mounted and panel mounted equipment;

• equipment intended for indoor use and outdoor use.

Equipment used in conjunction with equipment for electrical energy measurement and control may need to comply with additional safety requirements. See also Clause 13.

NOTE 5 Examples are telecommunication modems and customer information units.

This International Standard does not apply to:

• equipment where the voltage line-to -neutral derived from nominal voltages exceeds 600 V;

• portable meters;

NOTE 6 Portable meters are meters that are not permanently connected.

• laboratory and mobile meter test equipment;•reference standard meters.The safety requirements of this standard are based on the following assumptions:

• metering equipment has been installed correctly;

• metering equipment is used generally by unskilled persons, including meter readers and consumers of electrical energy. In many cases, it is installed in a way that it is freely accessible. Its terminal covers cannot be removed and its case cannot be opened without removing seals and using a tool;

• during normal use all terminal covers, covers and barriers providing protection against accessing hazardous live parts are in place;

• for installation, configuration, maintenance and repair it may be necessary to remove terminal cover(s), (a part of) the case or barriers so that hazardous live parts may become accessible. Such activities are performed by skilled personnel, who have been suitably trained to be aware of working procedures necessary to ensure safety. Therefore, safety requirements covering these conditions are out of the Scope of this standard.

1.2 Object

1.2.1 Aspects included in scope

NOTE 1 Subclause 1.2 is based on IEC 61010-1:2010, 1.2.

The purpose of the requirements of this standard is to ensure that hazards to the user and the surrounding area are reduced to a tolerable level.

Requirements for protection against particular types of hazard are given in Clauses 6 to 12 as follows:

a) electrical shock or burn (see Clause 6);

b) mechanical hazards and stresses (see Clauses 7 and 8);

c) spread of fire from the equipment (see Clause 9);

d) excessive temperature (see Clause 10);

e) penetration of dust and water (see Clause 11);

f) liberated gases, explosion and implosion (see Clause 12).

Requirements for components and sub-assemblies are specified in Clause 13.

Requirements for protection against hazards arising from reasonably foreseeable misuse are specified in Clause 14.

Risk assessment for hazards or environments not fully covered above is specified in Clause 15.

NOTE 2 Attention is drawn to the existence of additional requirements specified by national authorities responsible for health and safety.

1.2.2 Aspects excluded from scope

This standard does not cover:

a) performance, reliability or other properties of the equipment not related to safety;

b) EMC requirements, which are covered by the relevant type testing standards;

NOTE 1 For EMC requirements and test methods, see IE C 62052-11:2003, IEC 62052-21:2004 and IEC 62055-31:2005

c) protective measures for explosive atmospheres (see IEC 60079-0 );

d) functional safety requirements;

e) effectiveness of transport packaging;

f) safety requirements of installations.

NOTE 2 The latter is generally subject to national regulation.

1.3 Verification

NOTE This subclause reproduces IEC 61010-1:2010, 1.3.

This standard also specifies methods of verifying that the equipment meets the requirements of this standard, through inspection, type tests, risk assessment and routine tests. See Clauses 4, 15 and Annex I respectively.

1.4 Environmental conditions

1.4.1 Normal environmental conditions

NOTE 1 Subclause 1.4 is based on IEC 61010-1:2010, 1.4.

This standard applies to metering equipment designed to be safe at least under the following conditions:

a) indoor use;

b) altitude up to 2 000 m;

c) climatic conditions according to 3K5, but with low air temperature -10oC; seeIEC 60721-3-3:1994; NOTE 2 3K5 specifies low air temperature -5 °C, high air temperature +45 °C, low relative humidity 5 %, high relative humidity 95 %. See the climatogram in IEC 60721-3-3:1994, Figure B.5.

d) voltage fluctuations up to -20...15 % of the nominal voltage;

The equipment may have several nominal voltages.e) transient overvoltages up to the levels of overvoltage category III;

f) transient overvoltages occurring on the mains supply (see;

g) applicable pollution degree of the intended environment (pollution degree 2 in most cases).Manufacturers may specify more restricted environmental conditions for operation; nevertheless, the equipment shall be safe within these normal environmental conditions.

1.4.2 Extended environmental conditions

This standard applies to metering equipment designed to be safe not only under the environmental conditions specified in 1.4.1, but also under any of the following conditions for which the equipment is ratedby the manufacturer:

a) outdoor use;

b) altitude above 2 000 m;

c) climatic conditions according to 3K6; see IEC 60721-3-3:1994;

NOTE 1 3K6 specifies low air temperature -25 °C, high air temperature +55 °C, low relative humidity 10 %, high relative humidity 100 %. See the climatogram in IEC 60721-3-3:1994, Figure B.6.

d) transient overvoltages higher than what is required for overvoltage category III.

NOTE 2 Under such circumstances, additional protection can be provided by external overvoltage protection elements. However, this is beyond the Scope of this standard. Information on the effects of installing varistors in large quantities on the network can be found in IEC TR 61000-2-3:1992, 6.6.1.

1.4.3 Extreme environmental conditions

NOTE 1 The following text is based on IEC 60721-3-0:1984, 5.2.

It is recognized that extreme environmental conditions may exist.

Elements determining the environmental conditions may occur with any of their severities in combination with other elements and their respective severities. An assumption that each element may occur with its highest severity would lead to unnecessary overdesign and cost. Therefore, specifications for products to operate under such extreme environmental conditions are a matter for negotiation between the manufacturer and the purchaser.

NOTE 2 For specific climatic conditions, see IEC 60721-3-3:1994.

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