IEC GUIDE 115:2021

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

IEC GUIDE 115:2021

Name:IEC GUIDE 115:2021   Standard name:Application of uncertainty of measurement to conformity assessment activities in the electrotechnical sector
Standard number:IEC GUIDE 115:2021   language:English language
Release Date:10-Mar-2021   technical committee:SMB - STANDARDIZATION MANAGEMENT BOARD
Drafting committee:   ICS number:17.020 - Metrology and measurement in general

IEC GUIDE 115
Edition 2.0 2021-03
REDLINE VERSION
GUIDE
colour
inside
Application of uncertainty of measurement to conformity assessment activities
in the electrotechnical sector








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IEC GUIDE 115
Edition 2.0 2021-03
REDLINE VERSION
GUIDE
colour
inside
Application of uncertainty of measurement to conformity assessment activities
in the electrotechnical sector

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 17.020; 19.080 ISBN 978-2-8322-9569-4

– 2 – IEC GUIDE 115:2021 RLV  IEC 2021

CONTENTS
FOREWORD . 3

INTRODUCTION . 5

1 Scope . 7

2 Normative references . 7

3 Terms and definitions . 7

4 Application of uncertainty of measurement principles . 8

4.1 General . 8
4.2 Uncertainty of measurement principles . 10
4.3 Background. 10
4.4 Uncertainty of measurement principles – Application of procedures . 11
4.5 Conclusion . 13
5 Guidance on making uncertainty of measurement calculations including examples
of how to perform the calculations . 13
5.1 General principles . 13
5.2 Summary of steps when estimating uncertainty . 14
5.3 Simple example – Estimation of measurement uncertainty for a temperature-
rise test with thermocouples . 17
Annex A (informative) Uncertainty of measurement calculations for product conformity
assessment testing – Examples 1 to 6 . 19
Bibliography . 30

Figure 1 – Procedure 1: uncertainty of measurement calculated . 11
Figure 2 – Procedure 2: accuracy method . 12

Table 1 . 12
Table 2 . 13
Table 3 . 14
Table 4 . 17
Table 5 . 18
Table 6 . 18
Table A.1 – Input test. 20

Table A.2 – Input power test . 22
Table A.3 – Leakage current measurement test . 23
Table A.4 – Distance measurement using calliper gauge . 25
Table A.5 – Torque measurement . 27
Table A.6 – Pre-conditioning for ball pressure test . 28

INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
APPLICATION OF UNCERTAINTY OF MEASUREMENT

TO CONFORMITY ASSESSMENT ACTIVITIES

IN THE ELECTROTECHNICAL SECTOR

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
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with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition GUIDE 115:2007. A vertical bar appears in the margin
wherever a change has been made. Additions are in green text, deletions are in
strikethrough red text.
– 4 – IEC GUIDE 115:2021 RLV  IEC 2021

This second edition of IEC Guide 115 has been prepared, in accordance with
ISO/IEC Directives, Part 1, Annex A, by IECEE/CTL. This is a non-mandatory guide in

accordance with SMB Decision 136/8.

This second edition cancels and replaces the first edition published in 2007.

The main changes with respect to the previous edition are as follows:

a) editorial alignment to ISO/IEC 17025:2017 without adapting the technical content;

b) references to ISO/IEC 17025:2005 and ISO/IEC 17025:2017 in order to help for the
transition to the new edition of ISO/IEC 17025.

The text of this IEC Guide is based on the following documents:
Four months' vote Report on voting
SMBNC/8/DV SMBNC/14/RV
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Guide is English.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2, and
developed in accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC
Supplement, available at /members_experts/refdocs. The main document types
developed by IEC are described in greater detail at /standardsdev/publications.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
INTRODUCTION
This document 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.
This document is of particular interest to the following IEC technical committees, which may
can decide to make use of it if necessary:

TECHNICAL COMMITTEE 13: EQUIPMENT FOR ELECTRICAL ENERGY MEASUREMENT,
TARIFF AND LOAD CONTROL
ELECTRICAL ENERGY MEASUREMENT AND CONTROL
TECHNICAL COMMITTEE 17: HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR
TECHNICAL COMMITTEE 18: ELECTRICAL INSTALLATIONS OF SHIPS AND OF MOBILE
AND FIXED OFFSHORE UNITS
TECHNICAL COMMITTEE 20: ELECTRIC CABLES
TECHNICAL COMMITTEE 21: SECONDARY CELLS AND BATTERIES
TECHNICAL COMMITTEE 22: POWER ELECTRONIC SYSTEMS AND EQUIPMENT
TECHNICAL COMMITTEE 23: ELECTRICAL ACCESSORIES
TECHNICAL COMMITTEE 32: FUSES
TECHNICAL COMMITTEE 33: POWER CAPACITORS AND THEIR APPLICATIONS
TECHNICAL COMMITTEE 34: LAMPS AND RELATED EQUIPMENT LIGHTING
TECHNICAL COMMITTEE 35: PRIMARY CELLS AND BATTERIES
TECHNICAL COMMITTEE 38: INS
...

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