IEC 60475:2022

IEC 60475 ®
Edition 3.0 2022-05
COMMENTED VERSION
INTERNATIONAL
STANDARD
colour
inside
Method of sampling insulating liquids
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IEC 60475 ®
Edition 3.0 2022-05
COMMENTED VERSION
INTERNATIONAL
STANDARD
colour
inside
Method of sampling insulating liquids
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.040.10 ISBN 978-2-8322-3524-9

– 2 – IEC 60475:2022 CMV © IEC 2022
CONTENTS
FOREWORD .3
INTRODUCTION .5
1 Scope .6
2 Normative references .6
3 Terms and definitions .6
4 General principles for the sampling of insulating liquids .7
4.1 New insulating liquids in delivery containers .7
4.1.1 Place of sampling .7
4.1.2 Quantity of sample to be taken .7
4.1.3 Sampling equipment .7
4.1.4 Sampling procedure . 11
4.2 Sampling of oil from oil-filled equipment . 13
4.2.1 General remarks . 13
4.2.2 Sampling of oil by syringe . 19
4.2.3 Sampling of oil by ampoule . 20
4.2.4 Sampling of oil by flexible metal bottles . 21
4.2.5 Sampling of oil by glass and rigid metal bottles . 22
4.2.6 Sampling of oil by plastic bottles . 23
4.3 Storage and transportation of samples . 23
4.4 Labelling of samples . 23
Annex A (informative) Procedure for sampling at intermediate levels (making up of the
average sample) . 25
A.1 Use of the thief dipper . 25
A.2 Use of the pipette . 25
A.3 Use of the siphon . 25
A.4 General remark . 25
Annex B (informative) Procedure for testing the integrity of the syringes . 26
Annex C (informative) Procedure for sampling oil from bushings . 27
Bibliography . 29
List of comments . 30

Figure 1 – Thief dipper .8
Figure 2 – Cream dipper .9
Figure 3 – Pipette . 10
Figure 4 – Siphon . 10
Figure 5 – Sampling of oil by syringe . 15
Figure 6 – Sampling of oil by ampoule . 16
Figure 7 – Sampling of oil by bottle . 17

Table 1 – Types of samples of new insulating liquids . 11
Table 2 – Sample containers for oil tests. 18
Table 3 – Information required on oil sample labels . 24

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
METHOD OF SAMPLING INSULATING LIQUIDS

FOREWORD
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This commented version (CMV) of the official standard IEC 60475:2022 edition 3.0 allows
the user to identify the changes made to the previous IEC 60475:2011 edition 2.0.
Futhermore, comments from IEC TC 10 experts are provided to explain the reasons of the
most relevant changes, or to clarify any part of the content.
A vertical bar appears in the margin wherever a change has been made. Additions are in
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blue-background number. Mouse over a number to display a pop-up note with the
comment.
This publication contains the CMV and the official standard. The full list of comments is
available at the end of the CMV.

– 4 – IEC 60475:2022 CMV © IEC 2022
IEC 60475 has been prepared by IEC technical committee 10: Fluids for electrotechnical
applications. It is an International Standard.
This third edition cancels and replaces the second edition published in 2011. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of a new Annex C on sampling of oil from bushings, at the request of IEC
subcommittee 36A, in order to transfer to IEC 60475 the corresponding contents of
IEC TR 61464 relating to oil sampling from bushings;
b) deletion of NOTE 2 in 4.2.1.2.
The text of this International Standard is based on the following documents:
Draft Report on voting
10/1163/FDIS 10/1173/RVD
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 International Standard is English.
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accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
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• reconfirmed,
• withdrawn,
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INTRODUCTION
General caution, health, safety and environmental protection
WARNING – This document does not purport to address all the safety problems associated with
its use. It is the responsibility of the user of this document to establish appropriate health and
safety practices and determine the applicability of regulatory limitations prior to use.
The insulating oils which are the subject of this document should be handled with due regard
to personal hygiene. Direct contact with the eyes may can cause irritation. In the case of eye
contact, irrigation with copious quantities of clean running water should be carried out and
medical advice sought. Some of the tests specified in this document involve the use of
processes that could lead to a hazardous situation. Attention is drawn to the relevant standard
for guidance.
Environment
This document is
...