Direct current (DC) plugs and socket-outlets for information and communication technology (ICT) equipment installed in data centres and telecom central offices - Part 1: Plug and socket-outlet system for 2,6 kW

IEC TS 62735-1:2015(E) applies to plugs and fixed socket-outlets for class I equipment with two active contacts plus an earthing contact, a rated power of 2,6 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, products according to IEC 60950.

General Information

Status
Published
Publication Date
27-Aug-2015
Technical Committee
Current Stage
PPUB - Publication issued
Start Date
28-Aug-2015
Completion Date
28-Aug-2015
Ref Project

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IEC TS 62735-1:2015 - Direct current (DC) plugs and socket-outlets for information and communication technology (ICT) equipment installed in data centres and telecom central offices - Part 1: Plug and socket-outlet system for 2,6 kW
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IEC TS 62735-1
Edition 1.0 2015-08
TECHNICAL
SPECIFICATION
colour
inside
Direct current (DC) plugs and socket-outlets for information and communication
technology (ICT) equipment installed in data centres and telecom central offices
Part 1: Plug and socket-outlet system for 2,6 kW
IEC TS 62735-1:2015-08(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC TS 62735-1
Edition 1.0 2015-08
TECHNICAL
SPECIFICATION
colour
inside
Direct current (DC) plugs and socket-outlets for information and communication
technology (ICT) equipment installed in data centres and telecom central offices
Part 1: Plug and socket-outlet system for 2,6 kW
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.120; 29.120.30 ISBN 978-2-8322-2869-2

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC TS 62735-1:2015 © IEC 2015
CONTENTS

FOREWORD ........................................................................................................................... 6

1 Scope .............................................................................................................................. 8

2 Normative references ...................................................................................................... 9

3 Terms and definitions .................................................................................................... 10

4 General requirements .................................................................................................... 14

5 General notes on tests .................................................................................................. 14

6 Ratings .......................................................................................................................... 16

7 Classification ................................................................................................................. 16

7.1 Accessory classifications ...................................................................................... 16

7.1.1 Classification according to the method of connecting the cable ...................... 16

7.1.2 Classification according to the type of terminals ............................................ 16

7.2 Socket-outlet classifications .................................................................................. 16

7.2.1 Classification according to the degree of protection against electric

shock ............................................................................................................. 16

7.2.2 Classification according to the existence of shutters ...................................... 16

7.2.3 Classification according to the method of application/mounting of the

socket-outlet .................................................................................................. 16

7.2.4 Classification according to the method of installation ..................................... 17

8 Marking ......................................................................................................................... 17

8.1 General ................................................................................................................. 17

8.2 Symbols ................................................................................................................ 17

8.3 Visibility of markings ............................................................................................. 18

8.4 Marking for plugs .................................................................................................. 18

8.5 Marking of terminals ............................................................................................. 18

8.6 Durability of marking ............................................................................................. 19

9 Checking of dimensions ................................................................................................. 19

10 Protection against electric shock ................................................................................... 19

11 Provision for earthing .................................................................................................... 22

12 Terminals and terminations ............................................................................................ 23

12.1 General ................................................................................................................. 23

12.2 Terminals with screw clamping for external copper conductors ............................. 24

12.3 Screwless terminals for external copper conductors .............................................. 29

12.4 Flat quick-connect terminations ............................................................................. 35

12.4.1 General ......................................................................................................... 35

12.4.2 Constructional requirements .......................................................................... 35

12.4.3 Electrical requirements .................................................................................. 36

12.5 Permanent connections......................................................................................... 36

13 Construction of socket-outlets ....................................................................................... 36

14 Construction of plugs ..................................................................................................... 43

15 Interlocked socket-outlets .............................................................................................. 48

16 Resistance to ageing, protection provided by enclosures, and resistance to

humidity ......................................................................................................................... 48

16.1 Resistance to ageing ............................................................................................ 48

16.2 Protection provided by enclosures ........................................................................ 49

16.2.1 General ......................................................................................................... 49

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IEC TS 62735-1:2015 © IEC 2015 – 3 –
16.2.2 Protection against access to hazardous parts and against harmful

effects due to ingress of solid foreign objects ................................................ 49

16.3 Resistance to humidity .......................................................................................... 50

17 Insulation resistance and electric strength ..................................................................... 51

18 Operation of earthing contacts ....................................................................................... 52

19 Temperature rise ........................................................................................................... 53

20 Breaking capacity .......................................................................................................... 56

21 Normal operation ........................................................................................................... 57

22 Force necessary to withdraw the plug ............................................................................ 58

22.1 General ................................................................................................................. 58

22.2 Verification of the maximum withdrawal force for socket-outlets ............................ 59

22.3 Verification of the minimum withdrawal force ......................................................... 59

23 Flexible cables and their connection .............................................................................. 60

24 Mechanical strength ...................................................................................................... 63

25 Resistance to heat ......................................................................................................... 72

26 Screws, current-carrying parts and connections ............................................................. 73

27 Creepage distances, clearances and distances through sealing compound .................... 75

28 Resistance of insulating material to abnormal heat and to fire ....................................... 77

29 Resistance to rusting ..................................................................................................... 78

Annex A (normative) Safety-related routine tests for factory-wired accessories

(protection against electric shock and correct polarity) ........................................................ 107

A.1 General remarks ................................................................................................. 107

A.2 Polarized systems, “+” and “−” – correct connection ............................................ 107

A.3 Earth continuity ................................................................................................... 108

A.4 Short-circuit/wrong connection and reduction of creepage distance and

clearances between “+” and “−” to earth ( ) ..................................................... 108

Annex B (normative) Survey of specimens needed for tests ............................................... 109

Annex C (informative) Alternative gripping tests ................................................................. 110

C.1 Gripping test C1 .................................................................................................. 110

C.2 Gripping test C2 .................................................................................................. 112

Annex D (normative) Standard sheets and gauges ............................................................. 114

D.1 Standard sheets .................................................................................................. 114

D.2 Gauges for checking the dimensions of the entry holes ....................................... 118

Bibliography ........................................................................................................................ 121

Figure 1 – Examples of accessories ...................................................................................... 80

Figure 2 – Pillar terminals ..................................................................................................... 81

Figure 3 – Screw terminals and stud terminals ...................................................................... 82

Figure 4 – Saddle terminals .................................................................................................. 83

Figure 5 – Mantle terminals................................................................................................... 84

Figure 6 – Example of thread-forming screw ......................................................................... 84

Figure 7 – Example of thread-cutting screw .......................................................................... 84

Figure 8 – Arrangement for compression test of 10.2 and 24.6 ............................................. 85

Figure 9 – Gauge for checking non-accessibility of live parts, through shutters ..................... 86

Figure 10 – Gauge for checking non-accessibility of live parts, through shutters, and of

live parts of socket-outlets with increased protection............................................................. 87

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– 4 – IEC TS 62735-1:2015 © IEC 2015

Figure 11 – Arrangement for checking damage to conductors ............................................... 88

Figure 12 – Information for deflection test ............................................................................. 89

Figure 13 – Device for checking the resistance to lateral strain ............................................. 90

Figure 14 – Example of apparatus for breaking capacity and normal operation test .............. 91

Figure 15 – Circuit diagram for breaking capacity and normal operation tests ...................... 92

Figure 16 – Apparatus for verification of maximum withdrawal force ..................................... 92

Figure 17 – Apparatus for testing cord retention.................................................................... 93

Figure 18 – Apparatus for flexing test ................................................................................... 94

Figure 19 – Sketches showing the application of the blows according to Table 20................. 95

Figure 20 – Apparatus for impact test at low temperature of 24.5 .......................................... 96

Figure 21 – Example of test arrangement to verify the fixation of pins in the body of the

plug ...................................................................................................................................... 97

Figure 22 – Arrangement for test on covers or cover-plates .................................................. 97

Figure 23 – Gauge (thickness about 2 mm) for the verification of the outline of covers

or cover-plates ...................................................................................................................... 98

Figure 24 – Examples of application of the gauge of Figure 23 on covers fixed without

screws on a mounting surface or supporting surface ............................................................. 99

Figure 25 – Examples of application of the gauge of Figure 23 in accordance with the

requirements of 24.16 ......................................................................................................... 100

Figure 26 – Gauge for verification of grooves, holes and reverse tapers ............................. 101

Figure 27 – Sketch showing the direction of application of the gauge of Figure 26 .............. 101

Figure 28 – Ball pressure test apparatus ............................................................................. 101

Figure 29 – Apparatus for compression test for the verification of resistance to heat of

25.5 .................................................................................................................................... 102

Figure 30 – Test procedures for normal operation (see Clause 21) ..................................... 103

Figure 31 – Clamping unit for the temperature rise test of Clause 19 .................................. 104

Figure 32 – The profile of the inrush current for the test of Clause 20 ................................. 105

Figure 33 – Annex to Figure 32 with additional information on a possible circuit to

produce the inrush current as given in Figure 32 ................................................................. 105

Figure 34 – Circuit diagram for testing socket-outlets and plugs according to 18.2 .............. 106

Figure 35 – Possible test setup for the temperature rise test for Clauses 19 and 21 ............ 106

Figure C.1 – Reference plug for gripping test ...................................................................... 111

Figure C.2 – Example of the test apparatus for plug gripping test ....................................... 112

Figure D.1 – Standard sheet 1: 2,6 kW / 294 V to 400 V d.c. socket-outlet for class I

equipment ........................................................................................................................... 115

Figure D.2 – Standard sheet 2: 2,6 kW / 294 V to 400 V d.c. plug for class I equipment ...... 116

Figure D.3 – Standard sheet 3: positioning of the “+” and “−” pins/socket-contacts ............. 117

Figure D.4 – Minimum gauges for checking the dimensions of the entry holes: C1 .............. 118

Figure D.5 – Maximum gauges for checking the dimensions of the entry holes: C2 ............. 118

Figure D.6 – Gauge for checking the first point of contact: C3 ............................................. 119

Figure D.7 – Gauges for checking the minimum withdrawal force (see 22.3) ....................... 119

Figure D.8 – Gauge for checking the maximum withdrawal force: C4max (see 22.2) ........... 120

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

areas or American Wire Gauge (AWG) size of copper conductors ......................................... 24

Table 2 – Values for pull test for screw-type terminals .......................................................... 26

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IEC TS 62735-1:2015 © IEC 2015 – 5 –

Table 3 – Composition of conductors .................................................................................... 27

Table 4 – Tightening torques for the verification of the mechanical strength of screw-

type terminals ....................................................................................................................... 28

Table 5 – Relationship between rated power and connectable cross-sectional areas or

AWG size of copper conductors for screwless terminals ....................................................... 30

Table 6 – Value for pull test for screwless-type terminals ...................................................... 32

Table 7 – Values for flexing under mechanical load test for copper conductors .................... 32

Table 8 – Test current for the verification of electrical and thermal stresses in normal

use for screwless terminals ................................................................................................... 33

Table 9 – Nominal cross-sectional areas or AWG size of rigid copper conductors for

deflection test of screwless terminals .................................................................................... 34

Table 10 – Deflection test forces ........................................................................................... 35

Table 11 – Forces to be applied to tabs ................................................................................ 36

Table 12 – Relationship between tab size and maximum current ........................................... 36

Table 13 – Forces to be applied to covers, cover-plates or actuating members whose

fixing is not dependent on screws ......................................................................................... 38

Table 14 – External cable dimension limits for surface-type socket-outlets ........................... 40

Table 15 – Nominal cross-sectional areas of copper conductors and test currents for

the temperature rise test ....................................................................................................... 54

Table 16 – Maximum and minimum withdrawal force for plugs and socket-outlets ................. 60

Table 17 – External dimensions of flexible cables to be accommodated by cord

anchorages ........................................................................................................................... 60

Table 18 – Torque test values for cord anchorages ............................................................... 61

Table 19 – Maximum dimensions of flexible cables to be accommodated in rewirable

accessories .......................................................................................................................... 62

Table 20 – Height of fall for impact tests ............................................................................... 65

Table 21 – Torque test values for glands .............................................................................. 68

Table 22 – Resistance to heat of different types or parts of accessories ............................... 72

Table 23 – Creepage distances, clearances and distances through insulating sealing

compound ............................................................................................................................. 76

Table B.1 – Number of specimens needed for the tests according to 5.5 ............................. 109

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– 6 – IEC TS 62735-1:2015 © IEC 2015
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 1: Plug and socket-outlet system for 2,6 kW
FOREWORD

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

exceptional circumstances, a technical committee may propose the publication of a Technical

Specification when

• the required support cannot be obtained for the publication of an International Standard,

despite repeated efforts, or

• the subject is still under technical development or where, for any other reason, there is the

future but no immediate possibility of an agreement on an International Standard.

Technical Specifications are subject to review within three years of publication to decide

whether they can be transformed into International Standards.

IEC TS 62735-1, which is a Technical Specification, has been prepared by IEC technical

committee 23: Electrical accessories.
---------------------- Page: 8 ----------------------
IEC TS 62735-1:2015 © IEC 2015 – 7 –
In this standard, the following print types are used:
– compliance statements: in italic type
The text of this Technical Specification is based on the following documents:
Enquiry draft Report on voting
23/692/DTS 23/708A/RVC

Full information on the voting for the approval of this Technical Specification can be found in

the report on voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 62735 series, published under the general title Direct current (DC)

plugs and socket-outlets for information and communication technology (ICT) equipment

installed in data centres and telecom central offices, can be found on the IEC website.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• transformed into an International Standard,
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

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.
---------------------- Page: 9 ----------------------
– 8 – IEC TS 62735-1:2015 © IEC 2015
DIRECT CURRENT (DC) PLUGS AND SOCKET-OUTLETS FOR
INFORMATION AND COMMUNICATION TECHNOLOGY (ICT) EQUIPMENT
INSTALLED IN DATA CENTRES AND TELECOM CENTRAL OFFICES
Part 1: Plug and socket-outlet system for 2,6 kW
1 Scope

This part of IEC 62735, which is a Technical Specification, applies to plugs and fixed socket-

outlets for class I equipment with two active contacts plus an earthing contact, a rated power

of 2,6 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, products according to IEC 60950.

The accessories according to this part of IEC 62735 are intended to be used b
...

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