IEC GUIDE 115:2023

Application of measurement uncertainty to conformity assessment activities in the electrotechnical sector

IEC Guide 115:2023 presents a practical approach to the application of uncertainty of measurement to conformity assessment activities in the electrotechnical sector. It is specifically conceived for use in IECEE Schemes as well as by testing laboratories engaged in testing electrical products to national safety standards. It describes the application of uncertainty of measurement principles and provides guidance on making uncertainty of measurement calculations. It also gives some examples relating to uncertainty of measurement calculations for product conformity assessment testing. IEC Guide 115 has been prepared by the IECEE Committee of Testing Laboratories (CTL) to provide guidance on the practical application of the measurement uncertainty requirements of ISO/IEC 17025 to the electrical safety testing conducted within the IECEE CB Scheme. The IECEE CB Scheme is a multilateral, international agreement, among over 40 countries and some 60 national certification bodies, for the acceptance of test reports on electrical products tested to IEC standards.The aim of the CTL is, among other tasks, to define a common understanding of the test methodology with regard to the IEC standards as well as to ensure and continually improve the repeatability and reproducibility of test results among the member laboratories. The practical approach to measurement uncertainty outlined in this document has been adopted for use in the IECEE Schemes, and is also extensively used around the world by testing laboratories engaged in testing electrical products to national safety standards.

Application de l’incertitude de mesure aux activités d’évaluation de la conformité dans le secteur électrotechnique

L'IEC Guide 115:2023 présente une approche pratique de l’application de l’incertitude de mesure aux activités d’évaluation de la conformité dans le secteur électrotechnique. Il est spécifiquement conçu pour être utilisé dans les méthodes du système IECEE ainsi que par les laboratoires qui réalisent les essais des produits électriques selon les normes nationales de sécurité. Il décrit l’application des principes de l’incertitude de mesure et donne des recommandations pour la réalisation des calculs de l’incertitude de mesure. Le présent Guide donne également quelques exemples de calculs de l’incertitude de mesure pour des essais d’évaluation de la conformité de certains produits. L'IEC Guide 115 a été établi par le Comité des laboratoires d’essai (CTL, Committee of Testing Laboratories) du système IEC d’essais de conformité et de certification des équipements électriques (IECEE, IEC System of Conformity Assessment Schemes for Electrotechnical Equipment and Components) afin de donner des recommandations pour l’application pratique des exigences concernant l’incertitude de mesure de l’ISO/IEC 17025 aux essais de sécurité électrique réalisés dans le cadre de la méthode des organismes de certification (OC) du système IECEE. La méthode OC du système IECEE est un accord international multilatéral conclu entre plus de 40 pays et quelque 60 organismes nationaux de certification pour l’acceptation des rapports d’essai sur les produits électriques soumis à essai selon les normes IEC. Le but du CTL est, entre autres tâches, de définir une analyse commune de la méthodologie d’essai selon les normes IEC ainsi que d’assurer et d’améliorer de manière continue la répétabilité et la reproductibilité des résultats d’essai entre les laboratoires membres. L’approche pratique de l’incertitude de mesure décrite dans le présent document a été adoptée pour être utilisée dans les méthodes du système IECEE et elle est également largement utilisée dans le monde par les laboratoires d’essai pour les essais des produits électriques selon les normes nationales de sécurité.

General Information

• Status: Published
• Publication Date: 11-Apr-2023
• ICS: 17.020 - Metrology and measurement in general
• ICS: 19.080 - Electrical and electronic testing
• Technical Committee: IEC/TC - IEC/TC
• Current Stage: PPUB - Publication issued
• Start Date: 28-Apr-2023
• Completion Date: 12-Apr-2023

Relations

• Revises: IEC GUIDE 115:2021 - Application of uncertainty of measurement to conformity assessment activities in the electrotechnical sector
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC GUIDE 115 ®
Edition 3.0 2023-04
GUIDE
GUIDE
Application of measurement uncertainty to conformity assessment activities in
the electrotechnical sector
Application de l’incertitude de mesure aux activités d’évaluation de la
conformité dans le secteur électrotechnique

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IEC GUIDE 115 ®
Edition 3.0 2023-04
GUIDE
GUIDE
Application of measurement uncertainty to conformity assessment activities in

the electrotechnical sector
Application de l’incertitude de mesure aux activités d’évaluation de la

conformité dans le secteur électrotechnique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.020; 19.080 ISBN 978-2-8322-6712-7

– 2 – IEC GUIDE 115:2023 © IEC 2023
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and symbols. 6
3.1 Terms and definitions . 6
3.2 Symbols . 8
4 Application of measurement uncertainty principles. 8
4.1 General . 8
4.2 Background. 9
4.3 Measurement uncertainty principles – Application of procedures . 10
4.4 Reporting statements of conformity . 11
Annex A (informative) Measurement uncertainty calculations for product conformity
assessment testing . 12
A.1 Overview. 12
A.2 Guidance on making measurement uncertainty calculations . 12
A.2.1 General principles . 12
A.2.2 Uncertainty estimation approach . 12
A.2.3 Type A evaluation . 12
A.2.4 Type B evaluation . 12
A.2.5 Individual uncertainties . 13
A.2.6 Summary of steps when estimating uncertainty . 13
A.3 Measurement uncertainty examples . 16
A.3.1 General . 16
A.3.2 Example 1 . 16
A.3.3 Example 2 . 17
A.3.4 Example 3 . 18
A.3.5 Example 4 . 19
A.3.6 Example 5 . 20
A.3.7 Example 6 . 22
Bibliography . 24

Figure 1 – Application of simple acceptance . 10

Table A.1 – Type B uncertainties . 13
Table A.2 – Temperature rise significant influencing factors . 16
Table A.3 – Temperature rise influencing factors to the measured value . 17
Table A.4 – Temperature rise uncertainty budget . 17
Table A.5 – Input test uncertainty budget . 18
Table A.6 – Input power test uncertainty budget . 19
Table A.7 – Leakage current measurement uncertainty budget . 20
Table A.8 – Caliper gauge uncertainty budget . 21
Table A.9 – Torque measurement uncertainty budget . 22

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
APPLICATION OF MEASUREMENT UNCERTAINTY TO CONFORMITY
ASSESSMENT ACTIVITIES IN THE ELECTROTECHNICAL SECTOR

FOREWORD
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This third edition of IEC Guide 115 has been prepared, in accordance with ISO/IEC Directives,
Part 1, Annex A, by IECEE/CTL.
This third edition cancels and replaces the second edition published in 2021.
The main changes with respect to the previous edition are as follows:
a) document was rewritten to align with ISO/IEC 17025:2017;
b) content has been added to replace "accuracy method" with "simple acceptance" and added
"decision rule";
c) modified document title to state "mea
...