IEC 60884-3-1:2021

IEC 60884-3-1 ®
Edition 1.0 2021-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Plugs and socket-outlets for household and similar purposes –
Part 3-1: Particular requirements for socket-outlets incorporating USB power
supply
Prises de courant pour usages domestiques et analogues –
Partie 3-1: Exigences particulières pour les socles de prise de courant qui
intègrent l'alimentation électrique par port USB

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.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

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.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Recherche de publications IEC - IEC online collection - oc.iec.ch
webstore.iec.ch/advsearchform Découvrez notre puissant moteur de recherche et consultez
La recherche avancée permet de trouver des publications IEC gratuitement tous les aperçus des publications. Avec un
en utilisant différents critères (numéro de référence, texte, abonnement, vous aurez toujours accès à un contenu à jour
comité d’études, …). Elle donne aussi des informations sur adapté à vos besoins.
les projets et les publications remplacées ou retirées.

Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
Le premier dictionnaire d'électrotechnologie en ligne au
Restez informé sur les nouvelles publications IEC. Just
monde, avec plus de 22 000 articles terminologiques en
Published détaille les nouvelles publications parues.
anglais et en français, ainsi que les termes équivalents dans
Disponible en ligne et une fois par mois par email.
16 langues additionnelles. Egalement appelé Vocabulaire

Electrotechnique International (IEV) en ligne.
Service Clients - webstore.iec.ch/csc

Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
sales@iec.ch.
IEC 60884-3-1 ®
Edition 1.0 2021-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Plugs and socket-outlets for household and similar purposes –

Part 3-1: Particular requirements for socket-outlets incorporating USB power

supply
Prises de courant pour usages domestiques et analogues –

Partie 3-1: Exigences particulières pour les socles de prise de courant qui

intègrent l'alimentation électrique par port USB

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.30 ISBN 978-2-8322-1029-0

– 2 – IEC 60884-3-1:2021 © IEC 2021
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 General requirements . 8
5 General remarks on tests . 8
6 Ratings . 10
7 Classification . 11
8 Marking . 11
9 Checking of dimensions . 12
10 Protection against electric shock . 12
11 Provision for earthing . 13
12 Terminals and terminations . 13
13 Construction of fixed socket-outlets . 14
14 Construction of plugs and portable socket-outlets . 14
15 Interlocked socket-outlets . 15
16 Resistance to ageing, protection provided by enclosures, and resistance to
humidity . 15
17 Insulation resistance and electric strength . 15
18 Operation of earthing contacts . 16
19 Temperature rise . 16
20 Breaking capacity . 18
21 Normal operation . 18
22 Force necessary to withdraw the plug . 19
23 Flexible cables and their connection . 19
24 Mechanical strength . 19
25 Resistance to heat . 20
26 Screws, current-carrying parts and connections . 21
27 Creepage distances, clearances and distances through sealing compound . 21
28 Resistance of insulating material to abnormal heat, to fire and to tracking . 21
29 Resistance to rusting . 21
30 Additional tests on pins provided with insulating sleeves . 21
31 EMC requirements . 21
32 Electromagnetic fields (EMF) requirements . 26
101 Abnormal conditions . 26
102 Particular requirements for the USB power supply circuit . 28
Annexes . 31
Annex AA (informative) Safety-related routine tests for electric strength test control –
Electric strength test of the USB power supply . 32
Bibliography . 34

Figure 101 – Minimum creepage and clearances on printed circuit boards . 27

Table 1 – Survey of specimens needed for tests . 9
Table 101 – Permissible temperature rise values . 17
Table 102 – Immunity tests (overview) . 22
Table 103 – Voltage dip and short-interruption test values . 23
Table 104 – Surge immunity test voltages . 23
Table 105 – Fast transient test values . 24
Table 106 – Values for radiated electromagnetic field test of IEC 61000-4-3 . 25
Table AA.1 – Test voltages . 32

– 4 – IEC 60884-3-1:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PLUGS AND SOCKET-OUTLETS
FOR HOUSEHOLD AND SIMILAR PURPOSES –

Part 3-1: Particular requirements for socket-outlets
incorporating USB power supply

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.
IEC 60884-3-1 has been prepared by subcommittee 23B: Plugs, socket-outlets and switches,
of IEC technical committee 23: Electrical accessories. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
23B/1360/FDIS 23B/1362/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.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
This document shall be used in conjunction with IEC 60884-1:— .
This document supplements or modifies the corresponding clauses in IEC 60884-1, so as to
convert that publication into the IEC International Standard: Particular requirements for socket-
outlets incorporating USB power supply.
Where this document states "addition", "modification" or "replacement", the relevant
requirement, test specifications or explanatory matter in IEC 60884-1 shall be adapted
accordingly.
Subclauses, figures, tables or notes which are additional to those in IEC 60884-1 are numbered
starting from 101. Additional annexes are lettered starting from AA.
A list of all parts in the IEC 60884 series, published under the general title Plugs and
socket-outlets for household and similar purposes, can be found on the IEC website.
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.
____________
Fourth edition under preparation. Stage at the time of publication: IEC FDIS 60884-1:2021.

– 6 – IEC 60884-3-1:2021 © IEC 2021
PLUGS AND SOCKET-OUTLETS
FOR HOUSEHOLD AND SIMILAR PURPOSES –

Part 3-1: Particular requirements for socket-outlets
incorporating USB power supply

1 Scope
IEC 60884-1:—, Clause 1 is applicable except as follows:
Replace the first paragraph by the following:
This part of IEC 60884 applies to fixed or portable socket-outlets for AC only, with or without
earthing contact, with a rated voltage greater than 50 V but not exceeding 440 V and a rated
current not exceeding 32 A, intended for household and similar purposes, either indoors or
outdoors, incorporating a USB power supply.
This document defines the safety and EMC requirements for socket-outlets incorporating a USB
power supply.
Specifications, performance and dimensional requirements of the USB technologies are not
covered by this document; these are defined in the relevant part(s) of IEC 62680.
2 Normative references
IEC 60884-1:—, Clause 2 is applicable except as follows:
Addition:
IEC 60317-0-1:2013, Specifications for particular types of winding wires – Part 0-1: General
requirements – Enamelled round copper wire
IEC 60317-0-1:2013/AMD1:2019
IEC 60884-1:— , Plugs and socket-outlets for household and similar purposes – Part 1: General
requirements
IEC 61000-3-2, Electromagnetic compatibility (EMC) – Part 3-2: Limits – Limits for harmonic
current emissions (equipment input current ≤16 A per phase)
IEC 61000-4-2, Electromagnetic compatibility (EMC) – Part 4-2: Testing and measurement
techniques – Electrostatic discharge immunity test
IEC 61000-4-3, Electromagnetic compatibility (EMC) – Part 4-3: Testing and measurement
techniques – Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-4, Electromagnetic compatibility (EMC) – Part 4-4: Testing and measurement
techniques – Electrical fast transient/burst immunity test
____________
Fourth edition under preparation. Stage at the time of publication: IEC FDIS 60884-1:2021.

IEC 61000-4-5, Electromagnetic compatibility (EMC) – Part 4-5: Testing and measurement
techniques – Surge immunity test
IEC 61000-4-6, Electromagnetic compatibility (EMC) – Part 4-6: Testing and measurement
techniques – Immunity to conducted disturbances, induced by radio-frequency fields
IEC 61000-4-8, Electromagnetic compatibility (EMC) – Part 4-8: Testing and measurement
techniques – Power frequency magnetic field immunity test
IEC 61000-4-11, Electromagnetic compatibility (EMC) – Part 4-11: Testing and measurement
techniques – Voltage dips, short interruptions and voltage variations immunity tests for
equipment with input current up to 16 A per phase
IEC 62368-1:2018, Audio/video, information and communication technology equipment – Part 1:
Safety requirements
IEC 62368-3:2017, Audio/video, information and communication technology equipment – Part 3:
Safety aspects for DC power transfer through communication cables and ports
CISPR 32, Electromagnetic compatibility of multimedia equipment – Emission requirements
3 Terms and definitions
IEC 60884-1:—, Clause 3 is applicable except as follows:
Replacement of NOTE 3:
NOTE 3 The term "accessory" is used as a general term covering socket-outlets and socket-outlets incorporating a
USB power supply; the term "portable accessory" covers portable socket-outlets and portable socket-outlets
incorporating a USB power supply.
Add the following terms and definitions:
3.101
universal serial bus
USB
standardized bus using serial transmission
[SOURCE: IEC 60050-171:2019, 171-04-48, modified – Note 1 to entry is deleted.]
3.102
USB port
IEC 62680 series female connector used to supply power to a connected portable device
3.103
USB power supply
electronic circuit, including connections to the socket-outlet, PCB, connectors, internal wiring
and similar that converts mains voltage into a lower voltage with smoothed direct current that
is delivered through one or more USB port
Note 1 to entry: USB connector types are defined in the IEC 62680 series.
3.104
SELV
electric system in which the voltage cannot exceed the value of extra-low voltage:
– under normal conditions and
– 8 – IEC 60884-3-1:2021 © IEC 2021
– under single fault conditions, including earth faults in other electric circuits
Note 1 to entry: SELV is the abbreviation for safety extra-low voltage.
[SOURCE: IEC 60050-826:2004, 826-12-31, modified – "SELV system" has been replaced with
"SELV".]
3.105
hazardous live part
live part with a voltage higher than 25 V AC or 60 V DC ripple free in dry conditions or 12 V AC
or 30 V DC in wet conditions
Note 1 to entry: Ripple free is conventionally an RMS ripple voltage not more than 10 % of the DC component.
Note 2 to entry: For the purpose of this document, parts of the USB ports delivering SELV are not considered to be
hazardous live parts as the output voltage of the USB remains below the limits of hazardous live parts.
3.106
rated output voltage
voltage assigned by the manufacturer to USB port
3.107
rated output current
current assigned by the manufacturer to USB port
3.108
rated output power
electric power output assigned by the manufacturer to USB port
Note 1 to entry: The rated output power is expressed in W.
3.109
maximum output power
highest output power attainable from the USB power supply
Note 1 to entry: The maximum output power can be different from the rated output power.
Note 2 to entry: The maximum output power can be shared or cumulated through several ports.
4 General requirements
IEC 60884-1:—, Clause 4 is applicable except as follows:
Add the following at the end of the clause:
Where reference to IEC 62368-1 and IEC 62368-3 is made in this document, the following
parameters are to be applied:
a) Overvoltage category:
Portable accessories: Minimum Cat II
Fixed accessories: Minimum Cat III
b) Pollution degree: 2
c) Material class: min. IIIa (CTI = 175)
d) Classification of use: By ordinary persons.
5 General remarks on tests
IEC 60884-1:—, Clause 5 is applicable except as follows.

5.4 Additional samples
IEC 60884-1:—, 5.4 is applicable except as follows:
Add the following before the last paragraph:
For the test of 17.2.1 b), 17.3, Clause 20, Clause 21 and Clause 22, additional specimens with
the USB power supply unit disconnected may be necessary.
For the tests of 24.101 a new set of specimens is required.
For the tests of Clause 101, additional specimens may be necessary.
For the tests of 102.3, additional specimens are required.
Replace Table 1 of IEC 60884-1:— with the following:
Table 1 – Survey of specimens needed for tests
Number of specimens
Fixed Portable
Clauses and subclauses of this document
socket- socket-
outlets outlets
6 Ratings A A
7 Classification A A
8 Marking A A
9 Checking of dimensions ABC ABC
a
10 Protection against electric shock ABC ABC
11 Provision for earthing ABC ABC
b, c
12 Terminals and terminations ABC
ABC
d, e
13 Construction of fixed socket-outlets –
ABC
d, e
14 Construction of plugs and portable socket-outlets –
ABC
15 Interlocked socket-outlets ABC ABC
f o f o
16 Resistance to ageing, to harmful ingress of water and to humidity
ABC GHI ABC GHI
g g
17 Insulation resistance and electric strength
ABC ABC
o o
17.2.1 b) Socket-outlets insulation resistance
GHI GHI
o o
17.3 Electric strength test GHI
GHI
18 Operation of earthing contacts ABC ABC
o o
Socket-outlets incorporating USB power supply temperature rise
19.101 a) GHI GHI
19.101 b) Socket-outlets incorporating USB power supply temperature rise ABC ABC
19.101 c) Socket-outlets incorporating USB power supply temperature rise ABC ABC
o o
20 Breaking capacity GHI GHI
o o
21 Normal operation GHI GHI
o o
22 Force necessary to withdraw the plug
GHI GHI
h
23 Flexible cables and their connection –
ABC
i, k
24 Mechanical strength ABC
ABC
q q
24.101 Mechanical tests of USB ports KLM KLM
i
25 Resistance to heat ABC ABC
– 10 – IEC 60884-3-1:2021 © IEC 2021
Number of specimens
Fixed Portable
Clauses and subclauses of this document
socket- socket-
outlets outlets
26 Screws, current-carrying parts and connections ABC ABC
Creepage distances, clearances and distances through sealing
27 ABC ABC
compound
29 Resistance to rusting ABC ABC
28.1 Resistance to abnormal heat and to fire DEF DEF
k
28.2 DEF DEF
Resistance to tracking
p p
31 EMC Requirements J J
q r r
101 Abnormal conditions NOP NOP
q t t
102.3
Application of the clauses of IEC 62368-1 and IEC 62368-3 QRS QRS
a
One extra set of specimens is required for the test of 10.6.
b
One extra set of specimens is needed for each type of conductor for 12.2.6.
c
One extra set of specimens can be required for the test of 12.3.10. Five extra screwless terminals are used for
the test of 12.3.11 and one extra set of specimens is used for the test of 12.3.12.
d
One extra set of membranes is required for each of the tests of 13.22 and 13.23.
e
One extra set of specimens can be required to verify that the mechanical strength of the pin does not depend
on the plastic material.
f
One extra set of specimens is needed for 16.1.
g
One extra set of specimens of socket-outlets fitted with pilot lamps may be used for the tests of Clause 17.
h
One extra set of specimens is required for the tests of 23.2 and 23.4 for non-rewirable accessories for each
type of cable and cross-sectional area.
i
One extra set of specimens is required for the tests of 24.9 for shuttered socket-outlets.
j
Void.
k
One extra set of specimens is required for the tests of 24.13.2 and 24.13.3.
l
One extra set of aged specimens can be used for the tests of 25.3 and 25.4.
m
One extra set of specimens can be used.
n
Void
o
One extra set of aged specimens can be used with the USB power supply disconnected. The set of specimens
ABC can be used if it is possible to easily disconnect the USB power supply.
p
New specimen can be used if the specimen is no longer working.
q
For these tests, additional specimens can be necessary.
r
For these tests, additional specimens can be necessary.
s
For these tests, additional specimens can be necessary.
t
For these tests, additional specimens are required.

6 Ratings
IEC 60884-1:—, Clause 6 is applicable except as follows.
Add the following new subclauses:
6.101 Rated voltage
The rated voltage of the accessory shall be selected by the manufacturer according to the
nominal voltage of the fixed electrical installation where the accessory is intended to be installed.

NOTE 101 In the following country the rated voltage of the USB – socket-outlet combination, shall be according to
IEC 60884-1 Table 1: ZA.
6.102 USB output ratings
The USB power supply shall have a rated output voltage and rated output current or rated output
power not exceeding the specifications of the USB connectors, as defined in the relevant part(s)
of IEC 62680.
Compliance is checked by inspection of the markings and/or the manufacturer's documentation.
7 Classification
IEC 60884-1:—, Clause 7 is applicable.
8 Marking
IEC 60884-1:—, Clause 8 is applicable except as follows:
8.1 General
IEC 60884-1:—, 8.1 is applicable except as follows:
Add the following paragraphs at the end of the subclause:
In addition, accessories shall be marked with:
– rated output power of USB port in Watt, unless the output rating is expressed in Volt and
Ampere;
– rated input frequency in Hertz, unless the power supply is designed for both 50 Hz and
60 Hz.
8.2 Symbols
Add the following items before Note 1:
(IEC 60417-5031 (2002-10))
Watt. W
Hertz . Hz
Add the following Note after Note 4:
NOTE 101 The following is an example of the marking for current, voltage and nature of USB output:
5𝑉𝑉
5V 2,1A, alternatively: , alternatively: 5V DC 2100mA
2.1𝐴𝐴
Add the following new subclause:
8.101 Particular requirements for socket-outlets incorporating a USB power supply
The following additional information is recommended to be marked on the accessory and/or
given in the manufacturer's documentation:
– nature of the output voltage;
– rated output voltage;
– rated output current;
– 12 – IEC 60884-3-1:2021 © IEC 2021
– rated output power.
The minimum conductor size used for the connection of a USB power supply with dedicated
terminals, according to Clause 12 of this document, shall be marked on the accessories and/or
mentioned in the manufacturer’s documentation.
Compliance is checked by inspection.
NOTE 101 In the following country, USB outlets that are incorporated into fixed socket-outlets are to be fitted with
a disconnector switch that interrupts the live pole to the USB power supply: ZA.
Accessories incorporating a USB power supply are not class II equipment and shall not be
marked with the symbol for class II construction.
9 Checking of dimensions
IEC 60884-1:—, Clause 9 is applicable except as follows:
9.1 General
Add the following paragraph at the end of 9.1:
Relevant mechanical dimensions of the USB connectors are given in the associated drawings
in the relevant part(s) of IEC 62680.
Mechanical interference between either the relevant plug(s) and the USB port(s) preventing
their normal insertion and withdrawal or causing a partial insertion condition shall be prevented
when considering basic plugs, and as far as possible when considering the wide diversity of
adaptors and plugs shape.
Compliance is checked by inspection and measurement in reference to the relevant standard
sheet or USB connectors' design.
9.3 Permitted deviations
9.3 is not applicable to USB connectors.
10 Protection against electric shock
IEC 60884-1:—, Clause 10 is applicable except as follows:
10.1 General
Replace the first paragraph with the following:
Socket-outlets shall be so designed and constructed that when they are mounted and/or wired
as for normal use, hazardous live parts are not accessible, even after removal of parts which
can be removed without the use of a tool.
10.2 Accessibility of live parts during normal use
Add the following paragraph at the end of 10.2:
10.2 is not applicable to the accessible metal parts of USB ports.

10.4 Single pole insertion
Add the following paragraphs after the Note:
It shall not be possible to introduce a plug making contact between a hazardous live part of the
socket-outlet and a conductive part of the USB port(s).
Compliance is checked by inspection using plugs compatible with the socket-outlet. In case of
doubt, an electrical indicator supplied with a voltage between 40 V and 50 V is used.
NOTE 101 Standardized configurations of existing systems are described in IEC/TR 60083.
10.7 Socket-outlets with increased protection
Replace the first paragraph as follows:
Socket-outlets with or without lid, classified according to 7.2.1.2, shall be so constructed that,
when mounted and wired as in normal use, hazardous live parts shall not be accessible with a
steel gauge according to Figure 8 (1 mm gauge).
Add the following new subclauses:
10.101 Metal parts of the USB ports
Metal parts of the USB ports shall not be earthed.
Compliance is checked by inspection and by the test of Clause 27.
10.102 Output voltage protective measure
To ensure protection against electric shock, the USB power supply output voltage shall be SELV.
Compliance is check by the tests of Clause 17, Clause 27, Clause 101, and Clause 102.
11 Provision for earthing
IEC 60884-1:—, Clause 11 is applicable.
12 Terminals and terminations
IEC 60884-1:—, Clause 12 is applicable except as follows:
Add the following paragraphs at the end of 12.1:
Dedicated terminals for a USB power supply shall accept at least one conductor of the same
type and size as the socket-outlet in which it is incorporated.
If socket-outlet terminals are used for the connection of a USB power supply, the terminal
connection capacity requirements of IEC 60884-1:— still apply after connection.
In addition, the minimum size of the conductor to be used shall be marked on the accessories
and/or mentioned in the manufacturer's documentation.

– 14 – IEC 60884-3-1:2021 © IEC 2021
13 Construction of fixed socket-outlets
IEC 60884-1:—, Clause 13 is applicable except as follows:
Add the following new subclause:
13.101 Conductors used in a USB power supply
Internal wiring that is accessible during and/or after installation, if any, shall be secured in such
a way that it cannot become loose or detached and impair the safety of the accessory.
Conductor terminations using solder shall be mechanically secured. Hooking the conductor
through a hole of the conductive termination and affixing conductors in thermal tubing, sealing
compound or glue are examples of acceptable securement.
This requirement is not applicable to internal wiring that cannot be so displaced such that
clearances or creepage distances are reduced below the specified values or such that, if it
becomes loose, it cannot create hazardous connections between primary and secondary
circuits.
Compliance is checked by inspection.
The insulation of conductors shall provide sufficient resistance to the foreseeable temperatures
inside the device and/or the enclosure when installed in normal use. In addition, the insulation
of conductors running between circuits of different voltage bands shall meet the insulation
requirement of the highest voltage present.
The means used for securing the conductor in place shall be selected according to the
foreseeable temperature conditions present inside the device/enclosure.
The means used to secure the conductor shall not reduce the clearances and creepage
distances.
Compliance is checked by the tests of Clause 25 and Clause 27.
14 Construction of plugs and portable socket-outlets
IEC 60884-1:—, Clause 14 is applicable except as follows:
14.22 Components incorporated in accessories
This subclause is not applicable.
Add the following new subclause:
14.101 Conductors used in a USB power supply
Internal wiring, if any, shall be secured in such a way that it cannot become loose or detached
and impair the safety of the product.
Conductor terminations using solder shall be mechanically secured. Hooking the conductor
through a hole of the conductive termination and affixing conductors in thermal tubing, sealing
compound or glue are examples of acceptable securement.

This requirement is not applicable to internal wiring that cannot be so displaced such that
clearances or creepage distances are reduced below the specified values or such that, if it
becomes loose, it cannot create hazardous connections between primary and secondary
circuits.
Compliance is checked by inspection.
The insulation of conductors shall provide sufficient resistance to the foreseeable temperatures
inside the device and/or the enclosure when installed in normal use. In addition, the insulation
of conductors running between circuits of different voltage bands shall meet the insulation
requirement of the highest voltage present.
Means used for the method to secure the conductor in place shall be selected according to the
foreseeable temperature conditions present inside the device enclosure.
Means used to secure the conductor shall not reduce the clearances and creepage distances.
Compliance is checked by the tests of Clause 25 and Clause 27.
15 Interlocked socket-outlets
IEC 60884-1:—, Clause 15 is applicable.
16 Resistance to ageing, protection provided by enclosures, and resistance to
humidity
IEC 60884-1:—, Clause 16 is applicable.
17 Insulation resistance and electric strength
IEC 60884-1:—, Clause 17 is applicable except as follows:
17.2.1
Replace b) as follows:
b) between each pole in turn and all others, these being connected to the body with a plug in
engagement; during this test the USB power supply shall be disconnected;
NOTE 101 For these tests, additional specimens can be necessary.
17.3 Electric strength test
Add the following sentence after the first paragraph:
For this test, the USB power supply shall be disconnected.
NOTE 101 For these tests, additional specimens can be necessary.
Add the following new subclauses:

– 16 – IEC 60884-3-1:2021 © IEC 2021
17.101 Insulation resistance test with the USB power supply connected
The test of 17.2.1 is repeated between the following parts with the USB power supply connected,
having:
– 7 MΩ between SELV circuits and other circuit(s) having a higher voltage than SELV;
– 5 MΩ between SELV circuits.
17.102 Electric strength test with the USB power supply connected
The test of 17.3 is repeated between the following parts with the USB power supply connected,
having:
– 3 750 V between SELV circuits and other circuit(s) having a higher voltage than SELV, for
accessories having a rated voltage exceeding 130 V;
– 3 000 V between SELV circuits and other circuit(s) having a higher voltage than SELV, for
accessories having a rated voltage up to and including 130 V;
– 500 V between SELV circuits.
17.103 Internal wiring insulation
Internal wiring shall not reduce the insulation resistance as defined in Clause 17.
Compliance is checked by inspection with the conductors in the most onerous position.
18 Operation of earthing contacts
IEC 60884-1:—, Clause 18 is applicable.
19 Temperature rise
IEC 60884-1:—, Clause 19 is applicable except as follows:
Add a new dash to the end of the list in the second paragraph, as follows:
– accessory for which 19.101 applies.
Add the following new subclause:
19.101 Temperature rise test for socket-outlets incorporating a USB power supply
Socket-outlets are tested according to the tests described in a), b) and c) below:
a) according to IEC 60884-1:—, 19.1 with the USB power supply connected but not loaded.
NOTE 101 For these tests, additional specimens can be necessary.
For b) and c), the earthing circuit, if any, is not tested.
b) according to IEC 60884-1:—, 19.1 with the socket-outlet loaded at rated voltage and rated
current applied until the temperature rise reaches a steady state condition or for 4 h,
whichever is shorter. A steady state condition being where the temperature rise does not
exceed 1 K/h. The USB power supply is loaded with the most onerous combination of rated
output voltage and current.
The test in c) is performed only if the USB power supply has a temperature protection that
operates during test b).
c) the test in b) is repeated with the socket-outlet not loaded and the USB power supply loaded
with the most onerous combination of rated output voltage and current; the temperature
protection shall not operate.
During the tests in b) and c) the temperature rise shall be measured and shall not be higher
than the values given in the column concerning 19.101 in Table 101.
After these tests, the accessory shall be in operating condition.
Table 101 – Permissible temperature rise values
Permissible temperature
rise
Parts of the socket-outlet incorporating USB power supply K
Subclause Clause
19.101 101
External accessible parts when installed during normal use which can be touched

with test probe B of IEC 61032 when the plug and USB plug are inserted as in
normal use.
Metal parts  Rocker, cover or cover-plate, etc. 40 75
a
50 75
Enclosure
b
60 75
Non-metallic parts Rocker, cover or cover-plate, etc.
a, b
Enclosure 70 75
c c
Inside of enclosures of insulating material

d
Windings
Class A 75 115
Class E 90 130
Class B 95 140
Class F 115 155
Class H 140 175
Class 200 160 195
Class 220 180 215
Class 250 210 245
Core laminations As for relevant windings
d, g
Other insulations except thermoplastic
Non-impregnated paper 65 80
Non-impregnated cardboard 70 90
Impregnated cotton, silk, paper and textile, urea resins 80 100
Laminates bonded with phenol-formaldehyde resins, phenol-formaldehyde
95 120
mouldings with cellulose fillers
Phenol-formaldehyde mouldings with mineral fillers 105 140
i h
Laminates bonded with epoxy resins
130 160
Natural rubber 55 110
e
f
Thermoplastic materials
j
Terminals
45 110
Parts which can come into contact with cable insulation when installed 55 110

– 18 – IEC 60884-3-1:2021 © IEC 2021
The values of the permissible temperature rises are based on an ambient temperature of 25 °C, but the
measurements are made under normal conditions.
a 2
For areas not exceeding 5 cm and which are not likely to be touched in normal use, temperature rises up to
75 K are allowed under normal operating conditions.
b
If these temperature rises are higher than those allowed by the class of the relevant insulating material, the
nature of the material is the governing factor.
c
The permissible temperature rises for the inside of enclosures of insulating material are those indicated for
the relevant materials.
d
For the purpose of this document, the permissible temperature rises are based on the recommendations in
IEC 60085. The materials quoted above are shown only as examples. If materials other than those listed in
IEC 60085 are used, the maximum temperatures shall not exceed those which have been proved to be
satisfactory.
e
Natural and synthetic rubbers are not considered as being thermoplastic materials.
f
Owing to the wide variety of thermoplastic materials, it is not possible to specify permissible temperature rises
for them. While the matter is under consideration, the following method shall be used.
1) The softening temperature of the material is determined on a separate specimen, under the conditions
specified in ISO 306, modified as follows:
– the depth of penetrati
...