M/541 - Measuring Instruments

This document applies only to static watt-hour meters of accuracy classes A, B and C for the measurement of direct current electrical active energy in DC systems and it applies to their type tests.
NOTE 1   For general requirements, such as construction, EMC, safety, dependability etc., see the relevant EN 62052 series or EN 62059 series.
This document applies to electricity metering equipment designed to:
-   measure and control electrical energy on DC electrical networks with voltages up to 1 500 V;
NOTE 2   Meters for unearthed DC supplies and meters for three-wire DC networks are within the scope of this document.
-   form a complete meter including the legally relevant display of measured values;
NOTE 3   Electrical energy meters constructed from separate parts as described in WELMEC Guide 11.7:2017 are included.
-   operate with integrated or detached legally relevant displays;
-   optionally, provide additional functions other than those for measurement of electrical energy.
They can be used for measuring DC electrical energy, amongst others, in the following application areas:
-   in EV (electrical vehicle) charging stations or in EV charging infrastructure (also called EVSE, electric vehicle supply equipment), if energy is measured on the DC side;
-   in solar PV (photovoltaic) systems where DC power generation is measured;
-   in low voltage DC networks for residential or commercial areas, if energy is measured on the DC side, including similar applications like information technology (IT) server farms or DC supply points for communication equipment;
-   in DC supply points for public transport networks (e.g. for trolleybuses);
-   in mobile applications on vehicles for e-road (electric road) systems.
Meters designed for operation with external DC instrument transformers, transducers or shunts can be tested for compliance with this document only if such meters and their transformers, transducers or shunts are tested together and meet the requirements for directly connected meters. Requirements in this document and in EN IEC 62052 11:20211 applying to meters designed for operation with DC LPITs also apply to meters designed for operation with external instrument transformers, transducers or shunts.
NOTE 4   Modern electricity meters typically contain additional functions such as measurement of voltage magnitude, current magnitude, power, etc.; measurement of power quality parameters; load control functions; delivery, time, test, accounting, recording functions; data communication interfaces and associated data security functions. The relevant standards for these functions could apply in addition to the requirements of this document. However, the requirements for such functions are outside the scope of this document.
NOTE 5   Product requirements for power metering and monitoring devices (PMDs) and measurement functions such as voltage magnitude, current magnitude, power, etc., are covered in EN IEC 61557-12:2022. However, devices compliant with EN IEC 61557-12:2022 are not intended to be used as billing meters unless they are also compliant with EN IEC 62052 11:20211 and this document.
NOTE 6   Requirements for DC power quality (PQ) instruments, DC PQ measuring techniques, and DC PQ instrument testing are under discussion and will be specified in other standards.
This document does not apply to:
—   portable meters;
NOTE 7   Portable meters are meters that are not permanently connected.
—   meters used in rolling stock (railway applications), ships and airplanes;
NOTE 8   DC meters for rolling stock are covered by other standards, e.g. by the EN 50463 series.
[...]

This document applies only to static watt-hour meters of accuracy classes A, B and C for the measurement of direct current electrical active energy in DC systems and it applies to their type tests. NOTE 1 For general requirements, such as construction, EMC, safety, dependability etc., see the relevant EN 62052 series or EN 62059 series. This document applies to electricity metering equipment designed to: - measure and control electrical energy on DC electrical networks with voltages up to 1 500 V; NOTE 2 Meters for unearthed DC supplies and meters for three-wire DC networks are within the scope of this document. - form a complete meter including the legally relevant display of measured values; NOTE 3 Electrical energy meters constructed from separate parts as described in WELMEC Guide 11.7:2017 are included. - operate with integrated or detached legally relevant displays; - optionally, provide additional functions other than those for measurement of electrical energy. They can be used for measuring DC electrical energy, amongst others, in the following application areas: - in EV (electrical vehicle) charging stations or in EV charging infrastructure (also called EVSE, electric vehicle supply equipment), if energy is measured on the DC side; - in solar PV (photovoltaic) systems where DC power generation is measured; - in low voltage DC networks for residential or commercial areas, if energy is measured on the DC side, including similar applications like information technology (IT) server farms or DC supply points for communication equipment; - in DC supply points for public transport networks (e.g. for trolleybuses); - in mobile applications on vehicles for e-road (electric road) systems. Meters designed for operation with external DC instrument transformers, transducers or shunts can be tested for compliance with this document only if such meters and their transformers, transducers or shunts are tested together and meet the requirements for directly connected meters. Requirements in this document and in EN IEC 62052 11:20211 applying to meters designed for operation with DC LPITs also apply to meters designed for operation with external instrument transformers, transducers or shunts. NOTE 4 Modern electricity meters typically contain additional functions such as measurement of voltage magnitude, current magnitude, power, etc.; measurement of power quality parameters; load control functions; delivery, time, test, accounting, recording functions; data communication interfaces and associated data security functions. The relevant standards for these functions could apply in addition to the requirements of this document. However, the requirements for such functions are outside the scope of this document. NOTE 5 Product requirements for power metering and monitoring devices (PMDs) and measurement functions such as voltage magnitude, current magnitude, power, etc., are covered in EN IEC 61557-12:2022. However, devices compliant with EN IEC 61557-12:2022 are not intended to be used as billing meters unless they are also compliant with EN IEC 62052 11:20211 and this document. NOTE 6 Requirements for DC power quality (PQ) instruments, DC PQ measuring techniques, and DC PQ instrument testing are under discussion and will be specified in other standards. This document does not apply to: — portable meters; NOTE 7 Portable meters are meters that are not permanently connected. — meters used in rolling stock (railway applications), ships and airplanes; NOTE 8 DC meters for rolling stock are covered by other standards, e.g. by the EN 50463 series. [...]

This document applies only to static watt-hour meters of accuracy classes A, B and C for the measurement of alternating current electrical active energy in 50 Hz or 60 Hz networks and it applies to their type tests.
NOTE 1   For general requirements, such as construction, EMC, safety, dependability etc., see the relevant EN 62052 series or EN 62059 series.
This document applies to electricity metering equipment designed to:
- measure and control electrical energy on electrical networks (mains) with voltage up to 1 000 V AC;
NOTE 2   For AC electricity meters, the voltage mentioned above is the line-to-neutral voltage derived from nominal voltages. See EN 62052-31:2016, Table 7. EN 62052 31:2016 covers AC voltages only up to 600 V and Ed. 2 of EN IEC 62052 31 will cover AC voltages up to 1000 V.
- have all functional elements, including add-on modules, enclosed in, or forming a single meter case with exception of indicating displays;
- operate with integrated or detached indicating displays;
- be installed in specified matching sockets or racks;
- optionally, provide additional functions other than those for measurement of electrical energy.
Meters designed for operation with low power instrument transformers (LPITs as defined in the EN 61869 series) can be tested for compliance with this document only if such meters and their LPITs are tested together and meet the requirements for directly connected meters.
NOTE 3   Modern electricity meters typically contain additional functions such as measurement of voltage magnitude, current magnitude, power, frequency, power factor, etc.; measurement of power quality parameters; load control functions; delivery, time, test, accounting, recording functions; data communication interfaces and associated data security functions. The relevant standards for these functions could apply in addition to the requirements of this document. However, the requirements for such functions are outside the scope of this document.
NOTE 4   Product requirements for power metering and monitoring devices (PMDs) and measurement functions such as voltage magnitude, current magnitude, power, frequency, etc., are covered in EN 61557-12:2008. However, devices compliant with EN 61557-12:2008 are not intended to be used as billing meters unless they are also compliant with the EN IEC 62052-11:2021/A11:2022 and EN 50470-3:2022 standards.
NOTE 5   Product requirements for power quality instruments (PQIs) are covered in EN 62586-1:2017. Requirements for power quality measurement techniques (functions) are covered in EN 61000-4-30:2015. Requirements for testing of the power quality measurement functions are covered in EN 62586-2:2017.
This document does not apply to:
- meters for which the line-to-neutral voltage derived from nominal voltages exceeds 1 000 V AC;
- meters intended for connection with low power instrument transformers (LPITs as defined in the EN 61869 series) when tested without such transformers;
- metering systems comprising multiple devices (except of LPITs) physically remote from one another;
- portable meters;
NOTE 6   Portable meters are meters that are not permanently connected.
- meters used in rolling stock, vehicles, ships and airplanes;
- laboratory and meter test equipment;
- reference standard meters;
- data interfaces to the register of the meter;
- matching sockets or racks used for installation of electricity metering equipment;
- any additional functions provided in electrical energy meters.
This document does not cover measures for the detection and prevention of fraudulent attempts to compromise meter’s performance (tampering).
[...]

This part of IEC 62052 specifies requirements and associated tests, with their appropriate conditions for type testing of AC and DC electricity meters. This document details functional, mechanical, electrical and marking requirements, test methods, and test conditions, including immunity to external influences covering electromagnetic and climatic environments.

This document applies only to static watt-hour meters of accuracy classes A, B and C for the measurement of alternating current electrical active energy in 50 Hz or 60 Hz networks and it applies to their type tests. NOTE 1 For general requirements, such as construction, EMC, safety, dependability etc., see the relevant EN 62052 series or EN 62059 series. This document applies to electricity metering equipment designed to: - measure and control electrical energy on electrical networks (mains) with voltage up to 1 000 V AC; NOTE 2 For AC electricity meters, the voltage mentioned above is the line-to-neutral voltage derived from nominal voltages. See EN 62052-31:2016, Table 7. EN 62052 31:2016 covers AC voltages only up to 600 V and Ed. 2 of EN IEC 62052 31 will cover AC voltages up to 1000 V. - have all functional elements, including add-on modules, enclosed in, or forming a single meter case with exception of indicating displays; - operate with integrated or detached indicating displays; - be installed in specified matching sockets or racks; - optionally, provide additional functions other than those for measurement of electrical energy. Meters designed for operation with low power instrument transformers (LPITs as defined in the EN 61869 series) can be tested for compliance with this document only if such meters and their LPITs are tested together and meet the requirements for directly connected meters. NOTE 3 Modern electricity meters typically contain additional functions such as measurement of voltage magnitude, current magnitude, power, frequency, power factor, etc.; measurement of power quality parameters; load control functions; delivery, time, test, accounting, recording functions; data communication interfaces and associated data security functions. The relevant standards for these functions could apply in addition to the requirements of this document. However, the requirements for such functions are outside the scope of this document. NOTE 4 Product requirements for power metering and monitoring devices (PMDs) and measurement functions such as voltage magnitude, current magnitude, power, frequency, etc., are covered in EN 61557-12:2008. However, devices compliant with EN 61557-12:2008 are not intended to be used as billing meters unless they are also compliant with the EN IEC 62052-11:2021/A11:2022 and EN 50470-3:2022 standards. NOTE 5 Product requirements for power quality instruments (PQIs) are covered in EN 62586-1:2017. Requirements for power quality measurement techniques (functions) are covered in EN 61000-4-30:2015. Requirements for testing of the power quality measurement functions are covered in EN 62586-2:2017. This document does not apply to: - meters for which the line-to-neutral voltage derived from nominal voltages exceeds 1 000 V AC; - meters intended for connection with low power instrument transformers (LPITs as defined in the EN 61869 series) when tested without such transformers; - metering systems comprising multiple devices (except of LPITs) physically remote from one another; - portable meters; NOTE 6 Portable meters are meters that are not permanently connected. - meters used in rolling stock, vehicles, ships and airplanes; - laboratory and meter test equipment; - reference standard meters; - data interfaces to the register of the meter; - matching sockets or racks used for installation of electricity metering equipment; - any additional functions provided in electrical energy meters. This document does not cover measures for the detection and prevention of fraudulent attempts to compromise meter’s performance (tampering). [...]

This part of IEC 62052 specifies requirements and associated tests, with their appropriate conditions for type testing of AC and DC electricity meters. This document details functional, mechanical, electrical and marking requirements, test methods, and test conditions, including immunity to external influences covering electromagnetic and climatic environments.

2020-02-07: EC rejected for citation EMC
2018-09-12: positive assessments for MID and EMC.
2021: CLC legacy converted by DCLab NISOSTS

2021: CLC legacy converted by DCLab NISOSTS

IEC 62052-11:2020 (E) specifies requirements and associated tests, with their appropriate conditions for type testing of AC and DC electricity meters. This document details functional, mechanical, electrical and marking requirements, test methods, and test conditions, including immunity to external influences covering electromagnetic and climatic environments.
This document applies to electricity metering equipment designed to:
• measure and control electrical energy on electrical networks (mains) with voltage up to 1 000 V AC, or 1 500 V DC;
• have all functional elements, including add-on modules, enclosed in, or forming a single meter case with exception of indicating displays;
• operate with integrated displays (electromechanical or static meters);
• operate with detached indicating displays, or without an indicating display (static meters only);
• be installed in a specified matching sockets or racks;
• optionally, provide additional functions other than those for measurement of electrical energy.
Meters designed for operation with Low Power Instrument Transformers (LPITs as defined in the IEC 61869 series) may be tested for compliance with this document and the relevant IEC 62053 series documents only if such meters and their LPITs are tested together as directly connected meters.
This document is also applicable to auxiliary input and output circuits, operation indicators, and test outputs of equipment for electrical energy measurement.
This document also covers the common aspects of accuracy testing such as reference conditions, repeatability and measurement of uncertainty.
This document does not apply to:
• meters for which the voltage line-to-neutral derived from nominal voltages exceeds 1 000 V AC, or 1 500 V DC;
• meters intended for connection with low power instrument transformers (LPITs as defined in the IEC 61869 series of standards) when tested without such transformers;
• metering systems comprising multiple devices (except of LPITs) physically remote from one another;
• portable meters;
• meters used in rolling stock, vehicles, ships and airplanes;
• laboratory and meter test equipment;
• reference standard meters;
• data interfaces to the register of the meter;
• matching sockets or racks used for installation of electricity metering equipment;
• any additional functions provided in electrical energy meters.
This document does not cover measures for the detection and prevention of fraudulent attempts to compromise a meter’s performance (tampering).
This second edition cancels and replaces the first edition published in 2003, and its amendment 1:2016. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) Removed all meter safety requirements; the meter safety requirements are covered in IEC 62052-31:2015;
b) Included requirements for meter power consumption and voltage requirements from IEC 62053-61; IEC 62053-61 is withdrawn;
c) Included requirements for meter symbols from IEC 62053-52; IEC 62053-52 is withdrawn;
d) Included requirements for meter pulse output devices from IEC 62053-31; IEC 62053-31 is withdrawn;
e) Added new requirements and tests including: meters with detached indicating displays, and meters without indicating displays, meter sealing provisions; measurement uncertainty and repeatability; time-keeping accuracy; type tes

IEC 62052-11:2020 (E) specifies requirements and associated tests, with their appropriate conditions for type testing of AC and DC electricity meters. This document details functional, mechanical, electrical and marking requirements, test methods, and test conditions, including immunity to external influences covering electromagnetic and climatic environments. This document applies to electricity metering equipment designed to: • measure and control electrical energy on electrical networks (mains) with voltage up to 1 000 V AC, or 1 500 V DC; • have all functional elements, including add-on modules, enclosed in, or forming a single meter case with exception of indicating displays; • operate with integrated displays (electromechanical or static meters); • operate with detached indicating displays, or without an indicating display (static meters only); • be installed in a specified matching sockets or racks; • optionally, provide additional functions other than those for measurement of electrical energy. Meters designed for operation with Low Power Instrument Transformers (LPITs as defined in the IEC 61869 series) may be tested for compliance with this document and the relevant IEC 62053 series documents only if such meters and their LPITs are tested together as directly connected meters. This document is also applicable to auxiliary input and output circuits, operation indicators, and test outputs of equipment for electrical energy measurement. This document also covers the common aspects of accuracy testing such as reference conditions, repeatability and measurement of uncertainty. This document does not apply to: • meters for which the voltage line-to-neutral derived from nominal voltages exceeds 1 000 V AC, or 1 500 V DC; • meters intended for connection with low power instrument transformers (LPITs as defined in the IEC 61869 series of standards) when tested without such transformers; • metering systems comprising multiple devices (except of LPITs) physically remote from one another; • portable meters; • meters used in rolling stock, vehicles, ships and airplanes; • laboratory and meter test equipment; • reference standard meters; • data interfaces to the register of the meter; • matching sockets or racks used for installation of electricity metering equipment; • any additional functions provided in electrical energy meters. This document does not cover measures for the detection and prevention of fraudulent attempts to compromise a meter’s performance (tampering). This second edition cancels and replaces the first edition published in 2003, and its amendment 1:2016. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) Removed all meter safety requirements; the meter safety requirements are covered in IEC 62052-31:2015; b) Included requirements for meter power consumption and voltage requirements from IEC 62053-61; IEC 62053-61 is withdrawn; c) Included requirements for meter symbols from IEC 62053-52; IEC 62053-52 is withdrawn; d) Included requirements for meter pulse output devices from IEC 62053-31; IEC 62053-31 is withdrawn; e) Added new requirements and tests including: meters with detached indicating displays, and meters without indicating displays, meter sealing provisions; measurement uncertainty and repeatability; time-keeping accuracy; type tes

2021: CLC legacy converted by DCLab NISOSTS

2020-02-07: EC rejected for citation EMC
2018-09-12: positive assessments for MID and EMC.
2021: CLC legacy converted by DCLab NISOSTS

This European Standard applies to newly manufactured static watt-hour meters intended for residential, commercial and light industrial use, of class indexes A, B and C, for the measurement of alternating current electrical active energy in 50 Hz networks. It specifies particular requirements and type test methods. It applies to static watt-hour meters for indoor and outdoor application, consisting of a measuring element and register(s) enclosed together in a meter case. It also applies to operation indicator(s) and test output(s). If the meter has (a) measuring element(s) for more than one type of energy (multi-energy meters), or when other functional elements, like maximum demand indicators, electronic tariff registers, time switches, ripple control receivers, data communication interfaces etc. are enclosed in the meter case (multi-function meters) then this standard applies only for the active energy metering part. This standard distinguishes between: – meters of class indexes A, B and C; – direct connected and transformer operated meters; – meters for use in networks equipped with or without earth fault neutralizers. It does not apply to: – watt-hour meters where the voltage across the connection terminals exceeds 600 V (line-to-line voltage for meters for polyphase systems); – portable meters; – reference meters. Methods for acceptance testing are covered by the IEC 62058 series of standards. The dependability aspect is covered by the documents of the IEC 62059 series.