IEC TS 62735-2:2016

Direct current (DC) plugs and socket-outlets for information and communication technology (ICT) equipment installed in data centres and telecom central offices - Part 2: Plug and socket-outlet system for 5,2 kW

IEC TS 62735-2: 2016(E) applies to plugs and fixed socket-outlets for class I equipment with two active contacts plus an earthing contact, a rated power of 5,2 kW and a rated voltage range from 294 V to 400 V d.c. They are intended to power d.c. information and communication technology equipment only. The 2,6 kW system complying with Part 1 is safely compatible with the system complying with this part as it is possible to insert the 2,6 kW plug in the 5,2 kW socket-outlet but it is not possible to insert the 5,2 kW plug into the 2,6 kW socket-outlet.
This publication is to be read in conjunction with IEC TS 62735-1:2015

General Information

• Status: Published
• Publication Date: 13-Dec-2016
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.120.01 - Electrical accessories in general
• ICS: 29.120.30 - Plugs, socket-outlets, couplers
• Technical Committee: TC 23 - Electrical accessories
• Drafting Committee: WG 19 - TC 23/SC 23B/WG 19
• Current Stage: PPUB - Publication issued
• Start Date: 06-Jan-2017
• Completion Date: 14-Dec-2016

Standards Content (Sample)

IEC TS 62735-2 ®
Edition 1.0 2016-12
TECHNICAL
SPECIFICATION
Direct current (DC) plugs and socket-outlets for information and communication
technology (ICT) equipment installed in data centres and telecom central
offices –
Part 2: Plug and socket-outlet system for 5,2 kW
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.: [phone]
3, rue de Varembé Fax: [phone]
CH-1211 Geneva 20 [e-mail]
Switzerland www.iec.ch
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 corrigenda or an amendment might have been published.

IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 15 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.

IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and

CISPR.
IEC Just Published - webstore.iec.ch/justpublished

Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: [e-mail].
IEC TS 62735-2 ®
Edition 1.0 2016-12
TECHNICAL
SPECIFICATION
Direct current (DC) plugs and socket-outlets for information and communication

technology (ICT) equipment installed in data centres and telecom central

offices –
Part 2: Plug and socket-outlet system for 5,2 kW

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.120.01; 29.120.30 ISBN 978-2-8322-3708-3

– 2 – IEC TS 62735-2:2016 © IEC 2016
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General requirements . 7
5 General notes on tests . 7
6 Ratings . 7
7 Classification . 7
8 Marking . 7
9 Checking of dimensions . 8
10 Protection against electric shock . 8
11 Provision for earthing . 8
12 Terminals and terminations . 8
13 Construction of socket-outlets . 11
14 Construction of plugs . 11
15 Interlocked plug and socket-outlet systems . 12
16 Resistance to ageing, protection provided by enclosures, and resistance to
humidity . 12
17 Insulation resistance and electric strength . 12
18 Operation of earthing contacts . 13
19 Temperature rise . 13
20 Breaking capacity . 14
21 Normal operation . 14
22 Force necessary to withdraw the plug . 14
23 Flexible cables and their connection . 15
24 Mechanical strength . 16
25 Resistance to heat . 16
26 Screws, current-carrying parts and connections . 16
27 Creepage distances, clearances and distances through sealing compound . 16
28 Resistance of insulating material to abnormal heat and to fire . 16
29 Resistance to rusting . 16
Annexes . 16
Annex AA (normative) Standard sheets and gauges . 17
Bibliography . 21

Figure AA.1 – Standard sheet 4: 5,2 kW / 294 V to 400 V d.c. socket-outlet for class I
equipment . 18
Figure AA.2 – Standard sheet 5: 5,2 kW / 294 V to 400 V d.c. plug for class I
equipment . 19
Figure AA.3 – Standard sheet 6: positioning of the “+” and “−” pins/socket-contacts . 20

Table 1 – Relationship between rated power and connectable nominal cross-sectional

areas or American Wire Gauge (AWG) size of copper conductors . 9

Table 2 – Values for pull test for screw-type terminals . 9
Table 3 – Composition of conductors for plugs . 9
Table 5 – Relationship between rated power and connectable cross-sectional areas or
AWG size of copper conductors for screwless terminals . 10
Table 6 – Value for pull test for screwless-type terminals . 10
Table 7 – Values for flexing under mechanical load test for copper conductors . 10
Table 8 – Test current for the verification of electrical and thermal stresses in normal
use for screwless terminals . 10
Table 9 – Nominal cross-sectional areas or AWG size of rigid copper conductors for
deflection test of screwless terminals . 11
Table 10 – Deflection test forces . 11
Table 14 – External cable dimension limits for surface-type socket-outlets . 11
Table 15 – Nominal cross-sectional areas of copper conductors and test currents for
the temperature rise test . 13
Table 16 – Maximum and minimum withdrawal force for plugs and socket-outlets . 15
Table 17 – External dimensions of flexible cables to be accommodated by cord
anchorages . 15
Table 18 – Torque test values for cord anchorages . 15
Table 19 – Maximum dimensions of flexible cables to be accommodated in rewirable
accessories . 16

– 4 – IEC TS 62735-2:2016 © IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIRECT CURRENT (DC) PLUGS AND SOCKET-OUTLETS FOR
INFORMATION AND COMMUNICATION TECHNOLOGY (ICT) EQUIPMENT
INSTALLED IN DATA CENTRES AND TELECOM CENTRAL OFFICES –

Part 2: Plug and socket-outlet system for 5,2 kW

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.
The main task of IEC technical committees is to prepare International Standards. In
exceptional circumstances,
...