IEC 61386-22:2021
(Main)Conduit systems for cable management - Part 22: Particular requirements - Pliable conduit systems
Conduit systems for cable management - Part 22: Particular requirements - Pliable conduit systems
IEC 61386-22:2021 specifies the requirements for pliable conduit systems including self‑recovering conduit systems. This document is to be used in conjunction with IEC 61386-1:2008 and IEC 61386‑1:2008/AMD1:2017. This second edition cancels and replaces the first edition published in 2002. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- Annex AA has been added to provide guidance on the application of a constantly increasing force.
The content of the corrigendum 1 (2025-04) applies only to the French version.
Systèmes de conduits pour la gestion du câblage - Partie 22: Exigences particulières - Systèmes de conduits cintrables
La présente partie de l’IEC 61386 spécifie les exigences pour les systèmes de conduits cintrables, y compris les systèmes de conduits transversalement‑ élastiques.
Ce document doit être utilisé conjointement avec l’IEC 61386-1:2008 et l’IEC 61386‑1:2008/AMD1:2017.
Cette deuxième édition annule et remplace la première édition parue en 2002. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:
L’Annexe AA a été ajoutée. Elle donne des recommandations relatives à l’application d’une force croissant constamment.
La présente version bilingue (2021-12) correspond à la version anglaise monolingue publiée en 2021-04.
La version française de cette norme n'a pas été soumise au vote.
Le contenu du corrigendum 1 (2025-04) a été pris en considération dans cet exemplaire.
General Information
Relations
Standards Content (Sample)
IEC 61386-22 ®
Edition 2.0 2021-04
INTERNATIONAL
STANDARD
Conduit systems for cable management –
Part 22: Particular requirements – Pliable conduit systems
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform IEC online collection - oc.iec.ch
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variety of criteria (reference number, text, technical publications previews. With a subscription you will always
committee, …). It also gives information on projects, replaced have access to up to date content tailored to your needs.
and withdrawn publications.
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The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 000 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 18 additional languages.
once a month by email.
Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC 61386-22 ®
Edition 2.0 2021-04
INTERNATIONAL
STANDARD
Conduit systems for cable management –
Part 22: Particular requirements – Pliable conduit systems
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.120.10 ISBN 978-2-8322-9666-0
– 2 – IEC 61386-22:2021 © IEC 2021
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General requirements . 5
5 General conditions for tests . 5
6 Classification . 5
7 Marking and documentation . 5
8 Dimensions. 6
9 Construction . 7
10 Mechanical properties. 7
11 Electrical properties . 9
12 Thermal properties . 9
13 Fire hazard . 9
14 External influences . 9
15 Electromagnetic compatibility . 9
Annex A (normative) Classification coding for conduit systems . 13
Annex B (normative) Determination of material thickness . 13
Annex C (normative) Additional test requirements for conduit systems already
complying with IEC 61386-1:2008 . 13
Annex AA (informative) Calculation for minimum and maximum rate of increase of
force for 10.2.4 . 14
Figure 101 – Bending test apparatus . 10
Figure 102 – Gauge for checking the minimum inside diameter of the conduit system
after impact, bending, and resistance to heat tests . 11
Figure 103 – Assembly of conduit and terminating conduit fitting for bonding test . 12
Figure AA.1 – Graph showing force against time for 750 N force. 14
Table 101 – Thread lengths . 6
Table 102 – Maximum entry diameter and minimum entry length details . 7
Table AA.1 – Minimum and maximum rate of increase of force for 10.2.4 . 15
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CONDUIT SYSTEMS FOR CABLE MANAGEMENT –
Part 22: Particular requirements – Pliable conduit systems
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-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
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
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
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
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
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.
International Standard IEC 61386-22 has been prepared by subcommittee 23A: Cable
management systems, of IEC technical committee 23: Electrical accessories:
This second edition cancels and replaces the first edition published in 2002. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Annex AA has been added to provide guidance on the application of a constantly
increasing force.
– 4 – IEC 61386-22:2021 © IEC 2021
The text of this International Standard is based on the following documents:
FDIS Report on voting
23A/951/FDIS 23A/956/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts in the IEC 61386 series, published under the general title Conduit
systems for cable management, can be found on the IEC website.
This document is to be used in conjunction with IEC 61386-1:2008 and
IEC 61386-1:2008/AMD1:2017.
This document supplements or modifies the corresponding clauses of IEC 61386-1:2008 and
IEC 61386-1:2008/AMD1:2017. Where a particular clause or subclause of IEC 61386-1:2008
and IEC 61386-1:2008/AMD1:2017 is not mentioned in this document, that clause or
subclause applies as far as is reasonable. Where this document states "addition",
"modification" or "replacement", the relevant text of IEC 61386-1:2008 and
IEC 61386-1:2008/AMD1:2017 is to be adapted accordingly.
Subclauses, tables and figures which are in addition to those in IEC 61386-1:2008 and
IEC 61386-1:2008/AMD1:2017 are numbered starting with 101. Annexes which are additional
to those in IEC 61386-1:2008 and IEC 61386-1:2008/AMD1:2017 are lettered AA, BB, etc.
In this document, the following print types are used:
– Requirements proper: in roman type.
– Test specifications: in italic type.
– Explanatory matter: in smaller roman type.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised editi
...
IEC 61386-22 ®
Edition 2.0 2021-04
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Conduit systems for cable management –
Part 22: Particular requirements – Pliable conduit systems
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform IEC online collection - oc.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always
committee, …). It also gives information on projects, replaced have access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 000 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 18 additional languages.
once a month by email.
Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC 61386-22 ®
Edition 2.0 2021-04
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Conduit systems for cable management –
Part 22: Particular requirements – Pliable conduit systems
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.120.10 ISBN 978-2-8322-9708-7
– 2 – IEC 61386-22:2021 RLV © IEC 2021
CONTENTS
FOREWORD . 3
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General requirements . 6
5 General conditions for tests . 6
6 Classification . 6
7 Marking and documentation . 7
8 Dimensions. 7
9 Construction . 9
10 Mechanical properties. 9
11 Electrical properties . 11
12 Thermal properties . 11
13 Fire effects hazard . 11
14 External influences . 11
15 Electromagnetic compatibility . 12
Annex A (normative) Classification coding for conduit systems . 16
Annex B (normative) Determination of material thickness . 16
Annex C (normative) Additional test requirements for conduit systems already
complying with IEC 61386-1:2008 . 16
Annex AA (informative) Calculation for minimum and maximum rate of increase of
force for 10.2.4 . 17
Figure 101 – Bending test apparatus . 13
Figure 102 – Gauge for checking the minimum inside diameter of the conduit system
after impact, bending, and resistance to heat tests . 14
Figure 103 – Assembly of conduit and terminating conduit fitting for bonding test . 14
Figure AA.1 – Graph showing force against time for 750 N force. 17
Table 101 – Thread lengths . 8
Table 102 – Maximum entry diameter and minimum entry length details . 8
Table AA.1 – Minimum and maximum rate of increase of force for 10.2.4 . 18
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CONDUIT SYSTEMS FOR CABLE MANAGEMENT –
Part 22: Particular requirements – Pliable conduit systems
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-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
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
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
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
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
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 IEC 61386-22:2002. 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 61386-22:2021 RLV © IEC 2021
International Standard IEC 61386-22 has been prepared by subcommittee 23A: Cable
management systems, of IEC technical committee 23: Electrical accessories:
This second edition cancels and replaces the first edition published in 2002. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Annex AA has been added to provide guidance on the application of a constantly
increasing force.
The text of this International Standard is based on the following documents:
FDIS Report on voting
23A/951/FDIS 23A/956/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts in the IEC 61386 series, published under the general title Conduit
systems for cable management, can be found on the IEC website.
This document is to be used in conjunction with IEC 61386-1:2008 and
IEC 61386-1:2008/AMD1:2017.
This document supplements or modifies the corresponding clauses of IEC 61386-1:2008 and
IEC 61386-1:2008/AMD1:2017. Where a particular clause or subclause of IEC 61386-1:2008
and IEC 61386-1:2008/AMD1:2017 is not mentioned in this document, that clause or
subclause applies as far as is reasonable. Where this document states "addition",
"modification" or "replacement", the relevant text of IEC 61386-1:2008 and
IEC 61386-1:2008/AMD1:2017 is to be adapted accordingly.
Subclauses, tables and figures which are in addition to those in IEC 61386-1:2008 and
IEC 61386-1:2008/AMD1:2017 are numbered starting with 101. Annexes which are additional
to those in IEC 61386-1:2008 and IEC 61386-1:2008/AMD1:2017 are lettered AA, BB, etc.
In this document, the following print types are used:
– Requirements proper: in roman type.
– Test specifications: in italic type.
– Explanatory matter: in smaller roman type.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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.
– 6 – IEC 61386-22:2021 RLV © IEC 2021
CONDUIT SYSTEMS FOR CABLE MANAGEMENT –
Part 22: Particular requirements – Pliable conduit systems
1 Scope
This clause of part 1 is applicable, except as follows:
Clause 1 of IEC 61386-1:2008 is applicable, except as follows:
Addition:
This part of IEC 61386 specifies the requirements for pliable conduit systems including
self-recovering conduit systems.
2 Normative references
This clause of part 1 is applicable.
Clause 2 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable, except as
follows:
Addition:
IEC 61386-1:2008, Conduit systems for cable management – Part 1: General requirements
IEC 61386-1:2008/AMD1:2017
3 Terms and definitions
This clause of part 1 is applicable.
Clause 3 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable.
4 General requirements
This clause of part 1 is applicable.
Clause 4 of IEC 61386-1:2008 is applicable.
5 General conditions for tests
Clause 5 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable.
This clause of part 1 is applicable.
6 Classification
This clause of part 1 is applicable, except as follows:
Clause 6 of IEC 61386-1:2008 is applicable, except as follows:
Classifications 6.1.1, 1; 6.1.2, 1; 6.1.3, 1; 6.1.3, 4; 6.1.4, 1 and 6.1.5, 1 are not applicable.
NOTE Pliable conduit systems according to 6.1.1, 2 and 6.1.2, 2 and classification 1X 1 from 6.2.1, Table 1 are
not allowed in France.
7 Marking and documentation
This clause of part 1 is applicable, except as follows:
Clause 7 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable, except as
follows:
Addition:
7.1.101 The conduit shall be marked in accordance with 7.1 along its entire length at regular
intervals of preferably 1 m but not longer than 3 m. Where this is technically impractical, the
mark shall be on a label attached to the product at each end or on the packaging.
Compliance is checked by inspection.
7.1.102 The manufacturer shall document, for the conduit system, the minimum inside
diameter and the classification in accordance with Clause 6.
Compliance is checked by inspection of the manufacturer's documentation.
8 Dimensions
Replacement:
8.1 Threads shall comply with IEC 60423.
Outside diameters of non-metallic conduit shall comply with IEC 60423.
Outside diameters of metallic and composite conduits need not comply with IEC 60423,
provided that they are designed to be installed only with terminating conduit fittings having
threads complying with IEC 60423.
Compliance is checked by means of the gauges specified in IEC 60423.
8.2 Threadable conduits and threadable conduit fittings, except terminating conduit fittings,
shall comply with Table 101. Non-threadable conduit fittings, except fittings which are part of
a conduit system declaring tensile strength, shall comply with Table 102. The minimum inside
diameter of the conduit system shall be as declared by the manufacturer.
Compliance is checked by measurement.
– 8 – IEC 61386-22:2021 RLV © IEC 2021
Table 101 – Thread lengths
Size External thread Internal thread
Minimum length Minimum length
mm mm mm
6 05,5 06,5
8 06,5 07,5
10 08,5 09,5
12 10,5 11,5
16 12,5 13,5
20 14,0 15,0
25 17,0 18,0
32 19,0 20,0
40 19,0 20,0
50 19,0 20,0
63 19,0 20,0
75 19,0 20,0
Table 102 – Maximum entry diameter and minimum entry length details
External thread Internal thread
Maximum entry Minimum entry length
Size
diameter mm
mm
6 06,5 06,0
8 08,5 08,0
10 10,5 10,0
12 12,5 12,0
16 16,5 16,0
20 20,5 20,0
25 25,5 25,0
32 32,6 30,0
40 40,7 32,0
50 50,8 42,0
63 63,9 50,0
75 75,9 50,0
Size Maximum entry Minimum entry
diameter length
mm mm mm
6 06,5 06,0
8 08,5 08,0
10 10,5 10,0
12 12,5 12,0
16 16,5 16,0
20 20,5 20,0
25 25,5 25,0
32 32,6 30,0
40 40,7 32,0
50 50,8 42,0
63 63,9 50,0
75 75,9 50,0
9 Construction
This clause of part 1 is applicable.
Clause 9 of IEC 61386-1:2008 is applicable.
10 Mechanical properties
This clause of part 1 is applicable, except as follows:
Clause 10 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable, except
as follows:
10.2 Compression test
Subclause 10.2 is applicable with the following addition:
10.2.4 Add the following note at the end of Subclause 10.2.4:
NOTE In order to achieve a uniformly increasing compression force, the force indicated in Table 4 is divided by
time; this value is the required rate per second to fulfil the requirement.
Example: For a test force of 750 N an increase of the test force of 25 N/s is required (750 divided by 30 equals 25).
Informative Annex AA gives detailed calculations including tolerances for time and force.
For self-recovering conduits, replace Subclauses 10.2.4, 10.2.5, 10.2.6, 10.2.7 and 10.2.8,
with the following:
10.2.101 The intermediate steel piece shall be subjected to a uniformly increasing
compression force (N) reaching the force indicated in Table 4 after (30 ± 3) s. The sample
shall flatten by between 25 % and 50 % of its initial outside diameter.
If the sample flattens by less than 25 %, an additional test is carried out whereby the
intermediate steel piece is lowered onto the sample at constant speed until the sample is
flattened by (30 ± 3) % after (30 ± 3) s and the resultant force is measured.
– 10 – IEC 61386-22:2021 RLV © IEC 2021
A new sample is subjected to the uniformly increasing force (N) reaching the force measured
above after (30 ± 3) s. The sample shall flatten by between 25 % and 50 % of its initial outside
diameter.
The force and the intermediate steel piece shall then be removed. Fifteen minutes after
removal, the outside diameter of the sample, where it has flattened, shall be measured again.
After the test, the difference between the initial outside diameter and the outside diameter of
the flattened sample shall not exceed 10 % of the outside diameter, as measured before the
test, and the sample shall show no cracks visible to normal or corrected vision without
magnification.
10.4 Bending test
Replacement:
10.4.101 Conduits shall be subjected to a bending test by means of the apparatus as shown
in Figure 101.
10.4.102 The test shall be made on six samples of conduit, the length of each sample being
at least:
a) 30 times the nominal outside diameter for plain conduits;
b) 12 times the nominal outside diameter for corrugated conduits.
Three of the samples shall be tested at ambient temperature; the other three shall be tested
at the minimum declared temperature for transport, application and installation temperature
according to Table 1, with a tolerance of ±2 °C.
10.4.103 For the test at ambient temperature, the sample shall be clamped vertically in the
bending apparatus as shown in Figure 101. The sample shall be slowly bent by hand to the
left through an angle of (90 ± 5)°, then back to the vertical position, then to the right through
an angle of (90 ± 5)°, and then back to the vertical position. This sequence of operations shall
be repeated three more times but at the end the sample shall not be bent back to the vertical
position. The sample shall be maintained in the bent position for 5 min, after which it shall be
placed in such a position that the straight portions are at an angle of (45 ± 5)° to the vertical,
one end of the sample pointing upwards and the other downwards.
For the test at the minimum declared temperature for transport, application and installation
temperature according to Table 1, the sample clamped in the bending apparatus as shown in
Figure 101 shall be conditioned before the test for 2 h in a cold chamber at this the
aforementioned minimum declared temperature with a tolerance of ±2 °C.
After the test, the sample shall show no cracks visible to normal or corrected vision without
magnification and it shall be possible to pass the appropriate gauge, as shown in Figure 102,
through the sample under its own weight and without any initial speed.
10.5 Flexing test
This subclause of part 1 is not applicable.
Subclause 10.5 of IEC 61386-1:2008 is not applicable.
10.6 Collapse test
This subclause of part 1 is not applicable.
Subclause 10.6 of IEC 61386-1:2008 is not applicable.
10.7 Tensile strength test
This subclause of part 1 is applicable, except as follows:
Subclause 10.7 of IEC 61386-1:2008 is applicable, except as follows:
10.7.3 Not applicable.
11 Electrical properties
This clause of part 1 is applicable, except as follows:
Clause 11 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable, except
as follows:
11.2 Bonding test
Replacement:
A sample of a conduit and terminating conduit fitting shall be assembled in accordance with
the manufacturer's instructions and mounted as shown in Figure 103. A current of 25 A,
having a frequency of 50 Hz to 60 Hz, derived from an AC source having a no-load voltage
+5
not exceeding 12 V, shall be passed through the assembly for 1 min s. Then the voltage
drop shall be measured between the points as shown in Figure 103 and the resistance
calculated from the current and this voltage drop.
The resistance shall not exceed 0,05 Ω.
Where special devices are required for the coupling of conduit and terminating conduit
fittings, they shall be sufficient to remove the protective coating from the conduit, or the
protective finish shall be removed in accordance with the manufacturer’s instructions.
12 Thermal properties
This clause of part 1 is applicable, except as follows:
Clause 12 of IEC 61386-1:2008 is applicable, except as follows:
12.3 Replacement:
The load is then removed and immediately after its removal it shall be possible to pass the
appropriate gauge, as shown in Figure 102, through the conduit under its own weight and
without any initial speed, with the sample in the vertical position.
13 Fire effects hazard
This clause of part 1 is applicable.
Clause 13 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable.
14 External influences
This clause of part 1 is applicable
– 12 – IEC 61386-22:2021 RLV © IEC 2021
Clause 14 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable.
15 Electromagnetic compatibility
This clause of part 1 is applicable.
Clause 15 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable.
Addition:
Key
1 Sample
2 Centre
3 Guide for conduit
4 Support
Size Radius r
mm mm
Plain conduits Corrugated
conduits
6 40 20
8 50 25
10 60 30
12 80 40
16 96 48
20 120 60
25 150 75
32 192 96
40 300 160
50 480 200
63 600 252
75 720 300
NOTE This drawing is not intended to govern design except as regards the dimensions shown.
Figure 101 – Bending test apparatus
– 14 – IEC 61386-22:2021 RLV © IEC 2021
D: 80 % of the manufacturer's declared minimum inside diameter of the conduit
system
Material: Steel, hardened and polished, edges slightly rounded
Manufacturing tolerance:
+0,05
mm
Tolerance and axial dimension: ±0,2 mm
Admissible wear: 0,01 mm
NOTE The drawing is not intended to govern design except as regards the dimensions shown.
Figure 102 – Gauge for checking the minimum inside diameter of the conduit
system after impact, bending, and resistance to heat tests
Key
X = 12 mm ± 2 mm
1 3 mm steel plate
2 Optional locknut
3 Terminating conduit fitting secured to plate by tapped hole or by locknut on fitting thread
4 Conduit
Figure 103 – Assembly of conduit and terminating conduit fitting for bonding test
Annex A
(normative)
This annex of part 1 is applicable
Annex B
(normative)
This annex of part 1 is applicable.
– 16 – IEC 61386-22:2021 RLV © IEC 2021
Annex A
(normative)
Classification coding for conduit systems
Annex A of IEC 61386-1:2008 is applicable.
Annex B
(normative)
Determination of material thickness
Annex B of IEC 61386-1:2008 is applicable.
Annex C
(normative)
Additional test requirements for conduit systems already
complying with IEC 61386-1:2008
Annex C of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable.
Addition:
Annex AA
(informative)
Calculation for minimum and maximum rate of increase of force for 10.2.4
The following information is provided to assist test engineers to calculate the required rate of
increase of force vs time for compression test machines which have tolerances on the rate of
load application.
Calculations for minimum and maximum rate of increase of force for 10.2.4:
– minimum rate equals minimum force (Table 4) divided by maximum time (33 s);
– nominal rate equals nominal force (Table 4) divided by nominal time (30 s);
– maximum rate equals maximum force (Table 4 +4 %) divided by minimum time (27 s).
For 750 N force, this can be shown by Figure AA.1 as force (N) against time (s).
Key
Line 1. is maximum rate
Line 2. is minimum rate
Figure AA.1 – Graph showing force against time for 750 N force
– 18 – IEC 61386-22:2021 RLV © IEC 2021
For all force levels, the calculations are as given in Table AA.1.
Table AA.1 – Minimum and maximum rate of increase of force for 10.2.4
Compression Rate (N/s)
force
(N) Minimum Nominal Maximum
125 3,8 4,2 4,8
320 9,7 10,7 12,3
750 22,7 25,0 28,9
1 250 37,9 41,7 48,1
4 000 121,2 133,3 154,1
___________
IEC 61386-22 ®
Edition 2.0 2021-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Conduit systems for cable management –
Part 22: Particular requirements – Pliable conduit systems
Systèmes de conduits pour la gestion du câblage –
Partie 22: Exigences particulières – Systèmes de conduits cintrables
– 2 – IEC 61386-22:2021 © IEC 2021
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General requirements . 5
5 General conditions for tests . 5
6 Classification . 5
7 Marking and documentation . 5
8 Dimensions. 6
9 Construction . 7
10 Mechanical properties. 7
11 Electrical properties . 9
12 Thermal properties . 9
13 Fire hazard . 9
14 External influences . 9
15 Electromagnetic compatibility . 9
Annex A (normative) Classification coding for conduit systems . 13
Annex B (normative) Determination of material thickness . 13
Annex C (normative) Additional test requirements for conduit systems already
complying with IEC 61386-1:2008 . 13
Annex AA (informative) Calculation for minimum and maximum rate of increase of
force for 10.2.4 . 14
Figure 101 – Bending test apparatus . 10
Figure 102 – Gauge for checking the minimum inside diameter of the conduit system
after impact, bending, and resistance to heat tests . 11
Figure 103 – Assembly of conduit and terminating conduit fitting for bonding test . 12
Figure AA.1 – Graph showing force against time for 750 N force. 14
Table 101 – Thread lengths . 6
Table 102 – Maximum entry diameter and minimum entry length details . 7
Table AA.1 – Minimum and maximum rate of increase of force for 10.2.4 . 15
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CONDUIT SYSTEMS FOR CABLE MANAGEMENT –
Part 22: Particular requirements – Pliable conduit systems
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-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
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
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
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
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
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.
International Standard IEC 61386-22 has been prepared by subcommittee 23A: Cable
management systems, of IEC technical committee 23: Electrical accessories:
This second edition cancels and replaces the first edition published in 2002. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Annex AA has been added to provide guidance on the application of a constantly
increasing force.
– 4 – IEC 61386-22:2021 © IEC 2021
The text of this International Standard is based on the following documents:
FDIS Report on voting
23A/951/FDIS 23A/956/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts in the IEC 61386 series, published under the general title Conduit
systems for cable management, can be found on the IEC website.
This document is to be used in conjunction with IEC 61386-1:2008 and
IEC 61386-1:2008/AMD1:2017.
This document supplements or modifies the corresponding clauses of IEC 61386-1:2008 and
IEC 61386-1:2008/AMD1:2017. Where a particular clause or subclause of IEC 61386-1:2008
and IEC 61386-1:2008/AMD1:2017 is not mentioned in this document, that clause or
subclause applies as far as is reasonable. Where this document states "addition",
"modification" or "replacement", the relevant text of IEC 61386-1:2008 and
IEC 61386-1:2008/AMD1:2017 is to be adapted accordingly.
Subclauses, tables and figures which are in addition to those in IEC 61386-1:2008 and
IEC 61386-1:2008/AMD1:2017 are numbered starting with 101. Annexes which are additional
to those in IEC 61386-1:2008 and IEC 61386-1:2008/AMD1:2017 are lettered AA, BB, etc.
In this document, the following print types are used:
– Requirements proper: in roman type.
– Test specifications: in italic type.
– Explanatory matter: in smaller roman type.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
CONDUIT SYSTEMS FOR CABLE MANAGEMENT –
Part 22: Particular requirements – Pliable conduit systems
1 Scope
Clause 1 of IEC 61386-1:2008 is applicable, except as follows:
Addition:
This part of IEC 61386 specifies the requirements for pliable conduit systems including
self-recovering conduit systems.
2 Normative references
Clause 2 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable, except as
follows:
Addition:
IEC 61386-1:2008, Conduit systems for cable management – Part 1: General requirements
IEC 61386-1:2008/AMD1:2017
3 Terms and definitions
Clause 3 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable.
4 General requirements
Clause 4 of IEC 61386-1:2008 is applicable.
5 General conditions for tests
Clause 5 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable.
6 Classification
Clause 6 of IEC 61386-1:2008 is applicable, except as follows:
Classifications 6.1.1, 1; 6.1.2, 1; 6.1.3, 1; 6.1.3, 4; 6.1.4, 1 and 6.1.5, 1 are not applicable.
NOTE Pliable conduit systems according to 6.1.1, 2 and 6.1.2, 2 and classification 1 from 6.2.1, Table 1 are not
allowed in France.
7 Marking and documentation
Clause 7 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable, except as
follows:
– 6 – IEC 61386-22:2021 © IEC 2021
Addition:
7.1.101 The conduit shall be marked in accordance with 7.1 along its entire length at regular
intervals of preferably 1 m but not longer than 3 m. Where this is technically impractical, the
mark shall be on a label attached to the product at each end or on the packaging.
Compliance is checked by inspection.
7.1.102 The manufacturer shall document, for the conduit system, the minimum inside
diameter and the classification in accordance with Clause 6.
Compliance is checked by inspection of the manufacturer's documentation.
8 Dimensions
Replacement:
8.1 Threads shall comply with IEC 60423.
Outside diameters of non-metallic conduit shall comply with IEC 60423.
Outside diameters of metallic and composite conduits need not comply with IEC 60423,
provided that they are designed to be installed only with terminating conduit fittings having
threads complying with IEC 60423.
Compliance is checked by means of the gauges specified in IEC 60423.
8.2 Threadable conduits and threadable conduit fittings, except terminating conduit fittings,
shall comply with Table 101. Non-threadable conduit fittings, except fittings which are part of
a conduit system declaring tensile strength, shall comply with Table 102. The minimum inside
diameter of the conduit system shall be as declared by the manufacturer.
Compliance is checked by measurement.
Table 101 – Thread lengths
Size External thread Internal thread
Minimum length Minimum length
mm mm mm
6 05,5 06,5
8 06,5 07,5
10 08,5 09,5
12 10,5 11,5
16 12,5 13,5
20 14,0 15,0
25 17,0 18,0
32 19,0 20,0
40 19,0 20,0
50 19,0 20,0
63 19,0 20,0
75 19,0 20,0
Table 102 – Maximum entry diameter and minimum entry length details
Size Maximum entry Minimum entry
diameter length
mm mm mm
6 06,5 06,0
8 08,5 08,0
10 10,5 10,0
12 12,5 12,0
16 16,5 16,0
20 20,5 20,0
25 25,5 25,0
32 32,6 30,0
40 40,7 32,0
50 50,8 42,0
63 63,9 50,0
75 75,9 50,0
9 Construction
Clause 9 of IEC 61386-1:2008 is applicable.
10 Mechanical properties
Clause 10 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable, except
as follows:
10.2 Compression test
Subclause 10.2 is applicable with the following addition:
10.2.4 Add the following note at the end of Subclause 10.2.4:
NOTE In order to achieve a uniformly increasing compression force, the force indicated in Table 4 is divided by
time; this value is the required rate per second to fulfil the requirement.
Example: For a test force of 750 N an increase of the test force of 25 N/s is required (750 divided by 30 equals 25).
Informative Annex AA gives detailed calculations including tolerances for time and force.
For self-recovering conduits, replace Subclauses 10.2.4, 10.2.5, 10.2.6, 10.2.7 and 10.2.8,
with the following:
10.2.101 The intermediate steel piece shall be subjected to a uniformly increasing
compression force (N) reaching the force indicated in Table 4 after (30 ± 3) s. The sample
shall flatten by between 25 % and 50 % of its initial outside diameter.
If the sample flattens by less than 25 %, an additional test is carried out whereby the
intermediate steel piece is lowered onto the sample at constant speed until the sample is
flattened by (30 ± 3) % after (30 ± 3) s and the resultant force is measured.
A new sample is subjected to the uniformly increasing force (N) reaching the force measured
above after (30 ± 3) s. The sample shall flatten by between 25 % and 50 % of its initial outside
diameter.
– 8 – IEC 61386-22:2021 © IEC 2021
The force and the intermediate steel piece shall then be removed. Fifteen minutes after
removal, the outside diameter of the sample, where it has flattened, shall be measured again.
After the test, the difference between the initial outside diameter and the outside diameter of
the flattened sample shall not exceed 10 % of the outside diameter, as measured before the
test, and the sample shall show no cracks visible to normal or corrected vision without
magnification.
10.4 Bending test
Replacement:
10.4.101 Conduits shall be subjected to a bending test by means of the apparatus as shown
in Figure 101.
10.4.102 The test shall be made on six samples of conduit, the length of each sample being
at least:
a) 30 times the nominal outside diameter for plain conduits;
b) 12 times the nominal outside diameter for corrugated conduits.
Three of the samples shall be tested at ambient temperature; the other three shall be tested
at the minimum declared temperature for transport, application and installation according to
Table 1, with a tolerance of ±2 °C.
10.4.103 For the test at ambient temperature, the sample shall be clamped vertically in the
bending apparatus as shown in Figure 101. The sample shall be slowly bent by hand to the
left through an angle of (90 ± 5)°, then back to the vertical position, then to the right through
an angle of (90 ± 5)°, and then back to the vertical position. This sequence of operations shall
be repeated three more times but at the end the sample shall not be bent back to the vertical
position. The sample shall be maintained in the bent position for 5 min, after which it shall be
placed in such a position that the straight portions are at an angle of (45 ± 5)° to the vertical,
one end of the sample pointing upwar
...
IEC 61386-22 ®
Edition 2.0 2021-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Conduit systems for cable management –
Part 22: Particular requirements – Pliable conduit systems
Systèmes de conduits pour la gestion du câblage –
Partie 22: Exigences particulières – Systèmes de conduits cintrables
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IEC 61386-22 ®
Edition 2.0 2021-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Conduit systems for cable management –
Part 22: Particular requirements – Pliable conduit systems
Systèmes de conduits pour la gestion du câblage –
Partie 22: Exigences particulières – Systèmes de conduits cintrables
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.10 ISBN 978-2-8322-1061-8
– 2 – IEC 61386-22:2021 © IEC 2021
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General requirements . 5
5 General conditions for tests . 5
6 Classification . 5
7 Marking and documentation . 5
8 Dimensions. 6
9 Construction . 7
10 Mechanical properties. 7
11 Electrical properties . 9
12 Thermal properties . 9
13 Fire hazard . 9
14 External influences . 9
15 Electromagnetic compatibility . 9
Annex A (normative) Classification coding for conduit systems . 13
Annex B (normative) Determination of material thickness . 13
Annex C (normative) Additional test requirements for conduit systems already
complying with IEC 61386-1:2008 . 13
Annex AA (informative) Calculation for minimum and maximum rate of increase of
force for 10.2.4 . 14
Figure 101 – Bending test apparatus . 10
Figure 102 – Gauge for checking the minimum inside diameter of the conduit system
after impact, bending, and resistance to heat tests . 11
Figure 103 – Assembly of conduit and terminating conduit fitting for bonding test . 12
Figure AA.1 – Graph showing force against time for 750 N force. 14
Table 101 – Thread lengths . 6
Table 102 – Maximum entry diameter and minimum entry length details . 7
Table AA.1 – Minimum and maximum rate of increase of force for 10.2.4 . 15
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CONDUIT SYSTEMS FOR CABLE MANAGEMENT –
Part 22: Particular requirements – Pliable conduit systems
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-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
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
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
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
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
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.
International Standard IEC 61386-22 has been prepared by subcommittee 23A: Cable
management systems, of IEC technical committee 23: Electrical accessories:
This second edition cancels and replaces the first edition published in 2002. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Annex AA has been added to provide guidance on the application of a constantly
increasing force.
– 4 – IEC 61386-22:2021 © IEC 2021
The text of this International Standard is based on the following documents:
FDIS Report on voting
23A/951/FDIS 23A/956/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts in the IEC 61386 series, published under the general title Conduit
systems for cable management, can be found on the IEC website.
This document is to be used in conjunction with IEC 61386-1:2008 and
IEC 61386-1:2008/AMD1:2017.
This document supplements or modifies the corresponding clauses of IEC 61386-1:2008 and
IEC 61386-1:2008/AMD1:2017. Where a particular clause or subclause of IEC 61386-1:2008
and IEC 61386-1:2008/AMD1:2017 is not mentioned in this document, that clause or
subclause applies as far as is reasonable. Where this document states "addition",
"modification" or "replacement", the relevant text of IEC 61386-1:2008 and
IEC 61386-1:2008/AMD1:2017 is to be adapted accordingly.
Subclauses, tables and figures which are in addition to those in IEC 61386-1:2008 and
IEC 61386-1:2008/AMD1:2017 are numbered starting with 101. Annexes which are additional
to those in IEC 61386-1:2008 and IEC 61386-1:2008/AMD1:2017 are lettered AA, BB, etc.
In this document, the following print types are used:
– Requirements proper: in roman type.
– Test specifications: in italic type.
– Explanatory matter: in smaller roman type.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
CONDUIT SYSTEMS FOR CABLE MANAGEMENT –
Part 22: Particular requirements – Pliable conduit systems
1 Scope
Clause 1 of IEC 61386-1:2008 is applicable, except as follows:
Addition:
This part of IEC 61386 specifies the requirements for pliable conduit systems including
self-recovering conduit systems.
2 Normative references
Clause 2 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable, except as
follows:
Addition:
IEC 61386-1:2008, Conduit systems for cable management – Part 1: General requirements
IEC 61386-1:2008/AMD1:2017
3 Terms and definitions
Clause 3 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable.
4 General requirements
Clause 4 of IEC 61386-1:2008 is applicable.
5 General conditions for tests
Clause 5 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable.
6 Classification
Clause 6 of IEC 61386-1:2008 is applicable, except as follows:
Classifications 6.1.1, 1; 6.1.2, 1; 6.1.3, 1; 6.1.3, 4; 6.1.4, 1 and 6.1.5, 1 are not applicable.
NOTE Pliable conduit systems according to 6.1.1, 2 and 6.1.2, 2 and classification 1 from 6.2.1, Table 1 are not
allowed in France.
7 Marking and documentation
Clause 7 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable, except as
follows:
– 6 – IEC 61386-22:2021 © IEC 2021
Addition:
7.1.101 The conduit shall be marked in accordance with 7.1 along its entire length at regular
intervals of preferably 1 m but not longer than 3 m. Where this is technically impractical, the
mark shall be on a label attached to the product at each end or on the packaging.
Compliance is checked by inspection.
7.1.102 The manufacturer shall document, for the conduit system, the minimum inside
diameter and the classification in accordance with Clause 6.
Compliance is checked by inspection of the manufacturer's documentation.
8 Dimensions
Replacement:
8.1 Threads shall comply with IEC 60423.
Outside diameters of non-metallic conduit shall comply with IEC 60423.
Outside diameters of metallic and composite conduits need not comply with IEC 60423,
provided that they are designed to be installed only with terminating conduit fittings having
threads complying with IEC 60423.
Compliance is checked by means of the gauges specified in IEC 60423.
8.2 Threadable conduits and threadable conduit fittings, except terminating conduit fittings,
shall comply with Table 101. Non-threadable conduit fittings, except fittings which are part of
a conduit system declaring tensile strength, shall comply with Table 102. The minimum inside
diameter of the conduit system shall be as declared by the manufacturer.
Compliance is checked by measurement.
Table 101 – Thread lengths
Size External thread Internal thread
Minimum length Minimum length
mm mm mm
6 05,5 06,5
8 06,5 07,5
10 08,5 09,5
12 10,5 11,5
16 12,5 13,5
20 14,0 15,0
25 17,0 18,0
32 19,0 20,0
40 19,0 20,0
50 19,0 20,0
63 19,0 20,0
75 19,0 20,0
Table 102 – Maximum entry diameter and minimum entry length details
Size Maximum entry Minimum entry
diameter length
mm mm mm
6 06,5 06,0
8 08,5 08,0
10 10,5 10,0
12 12,5 12,0
16 16,5 16,0
20 20,5 20,0
25 25,5 25,0
32 32,6 30,0
40 40,7 32,0
50 50,8 42,0
63 63,9 50,0
75 75,9 50,0
9 Construction
Clause 9 of IEC 61386-1:2008 is applicable.
10 Mechanical properties
Clause 10 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable, except
as follows:
10.2 Compression test
Subclause 10.2 is applicable with the following addition:
10.2.4 Add the following note at the end of Subclause 10.2.4:
NOTE In order to achieve a uniformly increasing compression force, the force indicated in Table 4 is divided by
time; this value is the required rate per second to fulfil the requirement.
Example: For a test force of 750 N an increase of the test force of 25 N/s is required (750 divided by 30 equals 25).
Informative Annex AA gives detailed calculations including tolerances for time and force.
For self-recovering conduits, replace Subclauses 10.2.4, 10.2.5, 10.2.6, 10.2.7 and 10.2.8,
with the following:
10.2.101 The intermediate steel piece shall be subjected to a uniformly increasing
compression force (N) reaching the force indicated in Table 4 after (30 ± 3) s. The sample
shall flatten by between 25 % and 50 % of its initial outside diameter.
If the sample flattens by less than 25 %, an additional test is carried out whereby the
intermediate steel piece is lowered onto the sample at constant speed until the sample is
flattened by (30 ± 3) % after (30 ± 3) s and the resultant force is measured.
A new sample is subjected to the uniformly increasing force (N) reaching the force measured
above after (30 ± 3) s. The sample shall flatten by between 25 % and 50 % of its initial outside
diameter.
– 8 – IEC 61386-22:2021 © IEC 2021
The force and the intermediate steel piece shall then be removed. Fifteen minutes after
removal, the outside diameter of the sample, where it has flattened, shall be measured again.
After the test, the difference between the initial outside diameter and the outside diameter of
the flattened sample shall not exceed 10 % of the outside diameter, as measured before the
test, and the sample shall show no cracks visible to normal or corrected vision without
magnification.
10.4 Bending test
Replacement:
10.4.101 Conduits shall be subjected to a bending test by means of the apparatus as shown
in Figure 101.
10.4.102 The test shall be made on six samples of conduit, the length of each sample being
at least:
a) 30 times the nominal outside diameter for plain conduits;
b) 12 times the nominal outside diameter for corrugated conduits.
Three of the samples shall be tested at ambient temperature; the other three shall be tested
at the minimum declared temperature for transport, application and installation according to
Table 1, with a tolerance of ±2 °C.
10.4.103 For the test at ambient temperature, the sample shall be clamped vertically in the
bending apparatus as shown in Figure 101. The sample shall be slowly bent by hand to the
left through an angle of (90 ± 5)°, then back to the vertical position, then to the right through
an angle of (90 ± 5)°, and then back to the vertical position. This sequence of operations shall
be repeated three more times but at the end the sample shall not be bent back to the vertical
position. The sample shall be maintained in the bent position for 5 min, after which it shall be
placed in such a position that the straight portions are at an angle of (45 ± 5)° to the vertical,
one end of the sample pointing upwards and the other downwards.
For the test at the minimum declared temperature for transport, application and installation
according to Table 1, the sample clamped in the bending apparatus as shown in Figure 101
shall be conditioned before the test for 2 h in a cold chamber at the aforementioned minimum
declared temperature with a tolerance of ±2 °C.
After the test, the sample shall show no cracks visible to normal or corrected vision without
magnification and it shall be possible to pass the appropriate gauge, as shown in Figure 102,
through the sample under its own weight and without any initial speed.
10.5 Flexing test
Subclause 10.5 of IEC 61386-1:2008 is not applicable.
10.6 Collapse test
Subclause 10.6 of IEC 61386-1:2008 is not applicable.
10.7 Tensile test
Subclause 10.7 of IEC 61386-1:2008 is applicable, except as follows:
10.7.3 Not applicable.
11 Electrical properties
Clause 11 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable, except
as follows:
11.2 Bonding test
Replacement:
A sample of a conduit and terminating conduit fitting shall be assembled in accordance with
the manufacturer's instructions and mounted as shown in Figure 103. A current of 25 A,
having a frequency of 50 Hz to 60 Hz, derived from an AC source having a no-load voltage
+5
not exceeding 12 V, shall be passed through the assembly for 1 min s. Then the voltage
drop shall be measured between the points as shown in Figure 103 and the resistance
calculated from the current and this voltage drop.
The resistance shall not exceed 0,05 Ω.
12 Thermal properties
Clause 12 of IEC 61386-1:2008 is applicable, except as follows:
12.3 Replacement:
The load is then removed and immediately after its removal it shall be possible to pass the
appropriate gauge, as shown in Figure 102, through the conduit under its own weight and
without any initial speed, with the sample in the vertical position.
13 Fire hazard
Clause 13 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable.
14 External influences
Clause 14 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable.
15 Electromagnetic compatibility
Clause 15 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable.
– 10 – IEC 61386-22:2021 © IEC 2021
Addition:
Key
1 Sample
2 Centre
3 Guide for conduit
4 Support
Size Radius r
mm mm
Corrugated
Plain conduits
conduits
6 40 20
8 50 25
10 60 30
12 80 40
16 96 48
20 120 60
25 150 75
32 192 96
40 300 160
50 480 200
63 600 252
75 720 300
NOTE This drawing is not intended to govern design except as regards the dimensions shown.
Figure 101 – Bending test apparatus
D: 80 % of the manufacturer's declared minimum inside diameter of the conduit
system
Material: Steel, hardened and polished, edges slightly rounded
Manufacturing tolerance:
+0,05
mm
Tolerance and axial dimension: ±0,2 mm
Admissible wear: 0,01 mm
NOTE The drawing is not intended to govern design except as regards the dimensions shown.
Figure 102 – Gauge for checking the minimum inside diameter of the conduit
system after impact, bending, and resistance to heat tests
– 12 – IEC 61386-22:2021 © IEC 2021
Key
X = 12 mm ± 2 mm
1 3 mm steel plate
2 Optional locknut
3 Terminating conduit fitting secured to plate by tapped hole or by locknut on fitting thread
4 Conduit
Figure 103 – Assembly of conduit and terminating conduit fitting for bonding test
Annex A
(normative)
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