EN IEC 60688:2024/prAA:2026

Electrical measuring transducers for converting AC and DC electrical quantities to analogue or digital signals

This document applies to transducers (TRD) with electrical inputs and outputs for making measurements of AC or DC electrical quantities. The output signal can be in the form of an analogue or digital signal. This document applies to measuring transducers used for converting electrical quantities such as: – current, – voltage, – active power, – reactive power, – power factor, – phase angle, – frequency, – harmonics or total harmonic distortion, – apparent power, and – DC power to an output signal. NOTE The above electrical quantities include AC and/or DC components.

Elektrische Messumformer zur Umwandlung von elektrischen Wechselstromgrößen und Gleichstromgrößen in analoge oder digitale Signale

Transducteurs électriques de mesure convertissant les grandeurs électriques alternatives ou continues en signaux analogiques ou numériques

L'IEC 60688:2024 s’applique aux transducteurs (TRD) à grandeurs d’entrées et de sorties électriques destinés à mesurer des grandeurs électriques alternatives ou continues. Le signal de sortie peut être sous la forme d’un signal analogique ou numérique. Le présent document s’applique aux transducteurs de mesure destinés à convertir des grandeurs électriques, telles que: – le courant; – la tension; – la puissance active; – la puissance réactive; – le facteur de puissance; – le déphasage; – la fréquence; – les harmoniques ou la distorsion harmonique totale; – la puissance apparente; et – la puissance en courant continu, en signal de sortie. Le présent document s’applique: a) si la fréquence fondamentale de la ou des grandeurs d’entrée est comprise entre 0 Hz et 1 500 Hz; b) à un transducteur de mesure électrique appartenant à une chaîne de mesure d’une grandeur électrique ou non électrique; c) aux transducteurs destinés à une utilisation générale, par exemple à la télémesure, à la commande de processus et dans un des nombreux environnements spécifiés. Le présent document ne s’applique pas: – aux transformateurs de mesure conformes à la série IEC 61869; – aux transmetteurs utilisés dans un processus industriel conforme à la série IEC 60770; – aux dispositifs de comptage et de surveillance du réseau électrique (PMD) conformes à l’IEC 61557-12; – aux compteurs conformes à la série IEC 62053; – aux capteurs portatifs; – aux contrôleurs d’isolement à courant différentiel résiduel (RCM) conformes à l’IEC 62020-1; – aux dispositifs de détection de courant résiduel (RDC-DD) conformes à la série IEC 62955; – aux dispositifs de contrôle et de protection intégrés au câble (IC-CPD) conformes à la série IEC 62752; – aux dispositifs modulaires à courant résiduel (MRCD) conformes à l’IEC 60947-2:2016/AMD1:2019, Annexe M. Dans l’étendue de mesure, le signal de sortie varie en fonction du mesurande. Une alimentation auxiliaire peut être exigée. Le présent document a pour objet: – de spécifier la terminologie et les définitions relatives aux transducteurs dont l’application principale relève du domaine de l’industrie; – d’unifier les méthodes d’essai utilisées pour évaluer les performances des transducteurs; – de spécifier les limites de précision et les valeurs de sortie des transducteurs. L'IEC 60688:2024 annule et remplace la quatrième édition parue en 2021. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente: a) mise à jour des références normatives; b) mise à jour des définitions; c) mise à jour de la structure; d) ajout du mesurage de la puissance en courant continu.

Električni merilni pretvorniki za pretvarjanje izmeničnih električnih veličin v analogne ali digitalne signale

Ta dokument se nanaša na pretvornike (TRD) z električnimi vhodi in izhodi za merjenje izmeničnih (AC) ali enosmernih (DC) električnih veličin. Izhodni signal je lahko v obliki analognega ali digitalnega signala.
Ta dokument se uporablja za merilne pretvornike, ki se uporabljajo za pretvorbo električnih veličin, kot so:
– tok,
– napetost,
– aktivna moč,
– jalova moč,
– faktor moči,
– fazni kot,
– frekvenca,
– harmoniki ali skupna harmonska popačenost,
– navidezna moč, in
– enosmerna moč
v izhodni signal.
OPOMBA Zgornje električne veličine vključujejo komponente izmeničnega (AC) in/ali enosmernega (DC) toka.

General Information

• Status: Not Published
• Publication Date: 07-Jun-2027
• ICS: 17.220.20 - Measurement of electrical and magnetic quantities
• Technical Committee: CLC/TC 85X - Measuring equipment for electrical and electromagnetic quantities
• Drafting Committee: CLC/TC 85X/WG 1 - Maintenance and preliminary future work for measurement applications.
• Current Stage: 4010 - Start of preparation of Enquiry - Enquiry
• Start Date: 10-Mar-2026
• Completion Date: 19-Feb-2026
• Directive: Harmonized Standard2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Mandate: M/511 - Mandate to CEN, CENELEC and ETSI relating to harmonised standards in the field of the Low Voltage Directive
• Ref Project: SIST EN IEC 60688:2025/oprAA:2026 - Electrical measuring transducers for converting AC and DC electrical quantities to analogue or digital signals

Relations

• Amends: EN IEC 60688:2024 - Electrical measuring transducers for converting AC and DC electrical quantities to analogue or digital signals
• Effective Date: 10-Dec-2024

Overview

EN IEC 60688:2024/prAA:2026 is a draft European amendment to the standard for electrical measuring transducers, established by the European Committee for Electrotechnical Standardization (CLC). This document pertains to transducers (TRD) that convert alternating current (AC) or direct current (DC) electrical quantities into analogue or digital output signals. It sets requirements for performance, safety under low voltage conditions, electromagnetic compatibility, and environmental resilience for a wide range of measurements. Applications covered include the measurement and conversion of current, voltage, active and reactive power, frequency, phase angle, power factor, harmonics, total harmonic distortion, apparent power, and DC quantities.

This amendment aligns the standard with the latest technical references, incorporates changes for safety legislation compliance (such as the Low Voltage Directive 2014/35/EU), and clarifies environmental and construction requirements to ensure consistent and reliable operation of electrical measuring transducers.

Key Topics

• Scope of the Standard: Specifies requirements for TRDs with electrical inputs and analogue or digital outputs, for both AC and DC quantities.
• Performance and Safety: Addresses performance criteria, low voltage safety, and electromagnetic compatibility of measuring transducers.
• Environmental Conditions: Introduces specific environmental testing demands, referencing major IEC environmental testing standards (e.g., IEC 60068 series).
• Product Ratings: Lists detailed requirements for ratings, performance classifications, and marking.
• Design and Construction: Outlines compliance with widely-recognized IEC safety and design standards, such as IEC 61010-1 and IEC 60529 (IP Codes for enclosure protection).
• Type Testing: Specifies mandatory type tests to verify compliance with safety, performance, and durability expectations.
• Compliance with EU Legislation: Ensures alignment with the Low Voltage Directive and other relevant European regulations.

Applications

EN IEC 60688:2024/prAA:2026 is central to a broad array of sectors requiring reliable measurement and data conversion in electrical systems, including:

• Industrial Automation: Accurate conversion of electrical signals for monitoring, control, and automation systems.
• Energy Management: Measurement and conversion in smart grid environments, substations, and power distribution networks.
• Building Management Systems: Integration into systems that monitor electricity consumption and power quality in commercial and residential buildings.
• Electricity Metering: Use in devices that translate electrical quantities for billing, monitoring, or further data processing.
• Equipment Protection: Leveraging robust transducer designs for harsh environments or safety-critical applications, supported by specified durability and enclosure ratings.
• Testing and Calibration: Ensures that laboratory and field measurement equipment conform to precise, standardized requirements for repeatability and accuracy.

Related Standards

To provide a comprehensive framework, EN IEC 60688:2024/prAA:2026 references and interacts with several related international standards, including:

• IEC 60068 series: Environmental testing for temperature, vibration, humidity, and shock.
• IEC 60529: Degrees of protection provided by enclosures (IP Codes).
• IEC 61010-1 / IEC 61010-2-030: Safety requirements for electrical equipment for measurement and control.
• IEC 60664-1: Insulation coordination in low-voltage systems.
• IEC 61557-12, IEC 62586-1: Power monitoring and power quality instruments.
• IEC 60228 / IEC 62641: Conductors for cables and overhead lines.
• IEC 61326-1: EMC requirements for electrical measurement and control.
• ISO 4628-3: Evaluation of degradation-important for corrosion and service-life assessments.

Practical Value

This standard provides critical guidance to manufacturers, engineers, and end users for ensuring that electrical measuring transducers are safe, reliable, and interoperable within modern electrical systems. It enhances product quality, supports regulatory compliance, and underpins safe operation in various industrial and commercial contexts by setting transparent, harmonized criteria. Adopting EN IEC 60688:2024/prAA:2026 ensures that measuring transducers meet current and future demands for performance, safety, environmental endurance, and legal conformity across Europe.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2026
Električni merilni pretvorniki za pretvarjanje izmeničnih električnih veličin v
analogne ali digitalne signale
Electrical measuring transducers for converting AC and DC electrical quantities to
analogue or digital signals
Elektrische Messumformer zur Umwandlung von elektrischen Wechselstromgrößen und
Gleichstromgrößen in analoge oder digitale Signale
Transducteurs électriques de mesure convertissant les grandeurs électriques
alternatives ou continues en signaux analogiques ou numériques
Ta slovenski standard je istoveten z: EN IEC 60688:2024/prAA:2026
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD DRAFT
EN IEC 60688:2024
NORME EUROPÉENNE
EUROPÄISCHE NORM
prAA
May 2026
ICS 17.220.20 -
English Version
Electrical measuring transducers for converting AC and DC
electrical quantities to analogue or digital signals
Transducteurs électriques de mesure convertissant les Elektrische Messumformer zur Umwandlung von
grandeurs électriques alternatives ou continues en signaux elektrischen Wechselstromgrößen und Gleichstromgrößen
analogiques ou numériques in analoge oder digitale Signale
This draft amendment prAA, if approved, will modify the European Standard EN IEC 60688:2024; it is submitted to CENELEC members for
enquiry.
Deadline for CENELEC: 2026-07-31.

It has been drawn up by CLC/TC 85X.

If this draft becomes an amendment, CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this amendment the status of a national standard without any alteration.

This draft amendment was established by CENELEC in three official versions (English, French, German).
A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to
the CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 81065 Ref. No. EN IEC 60688:2024/prAA:2026 E

Contents Page
European foreword . 3
1 Modification to Clause 1, “Scope” . 4
2 Modification to Clause 2, ” Normative references” . 4
3 Modification to Clause 4, “Environmental conditions” . 5
4 Modification to Clause 5, “Ratings” . 5
5 Modification to Clause 6, “Requirements for design and construction” . 5
6 Modification to Clause 7, “Type tests” . 7
7 Modification to Clause 7, “Type tests” . 7
8 Modification to Annex B Clause B.4, ” Environmental conditions” . 7
9 Modification to Annex B Clause B.6, “Requirements for design and construction of TRD2”
........................................................................................................................................................ 7
10 Modification to Annex B Clause B.7, “Type tests of TRD2” . 8
11 Modification to annexes .10
12 Modification to Bibliography .14

European foreword
This document (EN IEC 60688:2024/prAA:2026) has been prepared by CLC/TC 85X “Measuring equipment for
electrical and electromagnetic quantities”.
This document is currently submitted to the Enquiry.
The following dates are proposed:
• latest date by which the existence of this (doa) dav + 6 months
document has to be announced at national
level
• latest date by which this document has to be (dop) dav + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dav + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)
This document amends EN IEC 60688:2024.
EN IEC 60688:2024.
— adaptation to LVD, addition of Annex ZZ.
This document has been prepared under a standardization request addressed to CENELEC by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
For the relationship with EU Legislation, see informative Annex ZZ, which is an integral part of this document.
1 Modification to Clause 1, “Scope”
Add after the first paragraph
“This document covers performances, safety low voltage and electromagnetic compatibility of transducers.”
2 Modification to Clause 2, ” Normative references”
Add
IEC 60028:1925, International standard of resistance for copper
IEC 60068-2-1:2025, Environmental testing - Part 2-1: Tests - Test A: Cold
IEC 60068-2-2:2025, Environmental testing - Part 2-2: Tests - Test B: Dry eat
Replace
IEC 60068-2-6, IEC 60068-2-11, IEC 60068-2-27, IEC TR 61000-2-3, ISO 4628-3:2016”.
With
IEC 60068-2-6:2007, IEC 60068-2-11:2021, IEC 60068-2-14:2023, IEC 60068-2-27:2008,
IEC 60068-2-78:2025, IEC TR 61000-2-3:1992, ISO 4628-3:2024”
Add
IEC 62641:2022, Conductors for overhead lines - Aluminium and aluminium alloy wires for concentric lay
stranded conductors
IEC 62052-11:2020, Electricity metering equipment - General requirements, tests and test conditions - Part 11:
Metering equipment
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
Replace
IEC 61010-1:2010, Safety requirements for electrical equipment for measurement, control, and laboratory use
– Part 1: General requirements
IEC 61010-1:2010/AMD1:2016
With
IEC 61010-1:2010, Safety requirements for electrical equipment for measurement, control, and laboratory use
– Part 1: General requirements
Replace
IEC 61010-2-030:2023, Safety requirements for electrical equipment for measurement, control, and laboratory
use – Part 2-030: Particular requirements for equipment having testing or measuring circuits
With
IEC 61010-2-030:2017, Safety requirements for electrical equipment for measurement, control, and laboratory
use – Part 2-030: Particular requirements for equipment having testing or measuring circuits

As amended by IEC 60529:1989/AMD1:1999, IEC 60529:1989/AMD2:2013 and IEC 60529:1989/COR1:2019.
As amended by IEC 61010-1:2010/AMD1:2016.
As amended by IEC 61010-1:2010/AMD1:2016 and IEC 61010-1:2010/COR1:2019.
3 Modification to Clause 4, “Environmental conditions”
Replace
“No requirements.”
With
“Requirements are specified in A.4 and B.4.”
4 Modification to Clause 5, “Ratings”
Replace
“No requirements.”
With
“Requirements are specified in A.5 and B.5.”
5 Modification to Clause 6, “Requirements for design and construction”
In 6.2.1 Class F and Class D
Replace
“IEC 61010-2-030:2023”
With
“IEC 61010-2-030:2017”
In 6.2.1 Class D
Replace
“TRD shall comply with IEC 60664-1:2020”
With
“TRD shall comply with IEC 60664-1:2020, Clause 5”
In 6.2.2.1
Replace
“See Annex H for guidance related to overvoltage categories and measurement categories.”
With
“NOTE See Annex H for guidance related to overvoltage categories and measurement categories.”
In 6.2.2.2.1
Delete
“Some exemptions may apply on the condition that they are based on a risk analysis, in which case the related
mitigation measures shall be documented.”
In 6.2.2.2.2
Delete
“Some exemptions may apply on the condition that they are based on a risk analysis, in which case the related
mitigation measures shall be documented.”
In 6.2.2.5
Replace
“IEC 61010-1:2010 and IEC 61010-1:2010/AMD1:2016”
With
“IEC 61010-1:2010, 6.5.5, 6.11, 9.6.”
In 6.2.7.2
Replace
“… IP40 requirements.”
With
“… IP40 requirements according to IEC 60529.”
Replace
“… IP2X requirements.”
With
“… IP2X requirements according to IEC 60529.”
Replace
“This requirement is not applicable to installations…”
With
“This requirement shall not apply to installations…”
Replace
“… should be clearly stated in the product documentation. “
With
“… shall be clearly stated in the product documentation. “
In 6.2.7.3
Replace
“The recommended minimum degree of protection for enclosures for outdoor TRD is IP44
according to IEC 60529”
With
“The minimum degree of protection for enclosures for outdoor TRD is IP44 according to IEC 60529:1989“
In 6.4
Replace
“No general requirements”
With
“Requirements are specified in A.6.4 and B.6.4.”
In 6.5
Replace
“No general requirements”
With
“Requirements are specified in A.6.5 and B.6.5.”
In 6.6
Replace
As impacted by IEC 61010-1:2010/A1:2016.
“No general requirements”
With
“Requirements are specified in A.6.6 and B.6.6.”
In 6.7
Replace
“No general requirements”
With
“Requirements are specified in A.6.7 and B.6.7.”
In 6.8
Replace
“No general requirements”
With
“Requirements are specified in A.6.8 and B.6.8.”
6 Modification to Clause 7, “Type tests”
Replace
“No general requirements.”
With
“Requirements are specified in A.7 and B.7.”
7 Modification to Clause 7, “Type tests”
Replace
“No general requirements.”
With
“Requirements are specified in B.8.”
8 Modification to Annex B Clause B.4, ” Environmental conditions”
In B.4.1
Replace
“TRD2 are used in the environmental conditions of measuring equipment such as PMD complying with
IEC 61557-12:2018 or PQI complying with IEC 62586-1:2017.
...