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BSI PD IEC/TS 62735-1:2015

BSI PD IEC/TS 62735-1:2015

$215.11

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

Published By Publication Date Number of Pages
BSI 2015 126
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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 by ordinary persons in data centres only where the value of the d.c. voltage distribution system is defined as follows:

  • 380 V with a tolerance of ±20 V for installations with no backup battery or with a voltage regulation system;

  • 380 V with a voltage range of 294 V to 400 V for installations with a backup battery where voltage regulation is not guaranteed;

  • the voltage value between each live conductor and earth does not exceed 200 V d.c. during normal operation;

  • there are two abnormal voltage ranges (duration below 10 min):

    • 260 V up to 294 V, and

    • above 400 V to 410 V.

The maximum current of the plug and the socket-outlet is

  • 6,5 A when the voltage between live contacts is 400 V d.c.,

  • 8,8 A when the voltage between live contacts is 294 V d.c.

and can rise up to 10 A when the voltage between live contacts decreases to 260 V d.c. for 10 min maximum.

The voltage between live conductors can fall down to 260 V d.c. when the voltage discharge value of the battery reaches the disconnecting level. The consequence is that the current increases accordingly.

The accessories according to this part of IEC 62735 do not require maintenance.

Plugs and socket-outlets covered by this part of IEC 62735 are intended for use in circuits where

  • basic protection,

  • an overcurrent protection (of 8,8 A or less for each socket-outlet or multiple socket-outlet),

  • the fault protection (indirect contact protection), and

  • additional protection

are already assured.

This part of IEC 62735 does not cover requirements for flush mounting boxes: however, it covers only those requirements for surface-type mounting boxes which are necessary for the tests on the socket-outlet.

NOTE 1 General requirements for mounting boxes are given in IEC 60670.

This part of IEC 62735 also applies to

  • plugs incorporated in cord sets,

  • plugs and socket-outlets incorporated in cord extension sets for data centres to be fixed to a wall or a rack,

  • the cord extension set and multiple socket-outlets for data centres intended to be fixed to a wall or a rack, and

  • socket-outlets which are a component of an assembly,

unless otherwise stated in the standard for the relevant assembly.

This part of IEC 62735 does not apply to

  • single or multiple portable socket-outlets not fixed to a wall or a rack;

  • plugs, socket-outlets and couplers for industrial purposes;

  • plugs, socket-outlets and vehicle couplers for electric vehicles according to the IEC 61851 and IEC 62196 series;

  • plugs and socket-outlets for household;

  • appliance couplers;

  • plugs, fixed and portable socket-outlets for extra-low voltage (ELV);

    NOTE 2 ELV values are specified in IEC 60364-4-41.

  • fixed socket-outlets combined with fuses, automatic switches, etc.

Socket-outlets with pilot lights are allowed provided that pilot lights comply with the relevant standard, if any.

Plugs and socket-outlets complying with this part of IEC 62735 are only suitable for use at ambient temperatures not normally exceeding +40 °C, but their average over a period of 24 h does not exceed +35 °C, with a lower limit of the ambient air temperature of −5 °C.

Socket-outlets complying with this part of IEC 62735 are only suitable for incorporation or mounting in equipment in such a way and in such a place that it is unlikely that the surrounding temperature exceeds 35 °C.

PDF Catalog

PDF Pages PDF Title
4 CONTENTS
8 FOREWORD
10 1 Scope
11 2 Normative references
12 3 Terms and definitions
16 4 General requirements
5 General notes on tests
18 6 Ratings
7 Classification
7.1 Accessory classifications
7.2 Socket-outlet classifications
19 8 Marking
8.1 General
8.2 Symbols
20 8.3 Visibility of markings
8.4 Marking for plugs
8.5 Marking of terminals
21 8.6 Durability of marking
9 Checking of dimensions
10 Protection against electric shock
24 11 Provision for earthing
25 12 Terminals and terminations
12.1 General
26 12.2 Terminals with screw clamping for external copper conductors
Tables
Table 1 – Relationship between rated power and connectable nominal cross-sectional areas or American Wire Gauge (AWG) size of copper conductors
28 Table 2 – Values for pull test for screw-type terminals
29 Table 3 – Composition of conductors
30 Table 4 – Tightening torques for the verification of the mechanical strength of screw-type terminals
31 12.3 Screwless terminals for external copper conductors
32 Table 5 – Relationship between rated power and connectable cross-sectionalareas or AWG size of copper conductors for screwless terminals
34 Table 6 – Value for pull test for screwless-type terminals
Table 7 – Values for flexing under mechanical load test for copper conductors
35 Table 8 – Test current for the verification of electrical and thermal stressesin normal use for screwless terminals
36 Table 9 – Nominal cross-sectional areas or AWG size of rigid copper conductors for deflection test of screwless terminals
37 12.4 Flat quick-connect terminations
Table 10 – Deflection test forces
38 12.5 Permanent connections
13 Construction of socket-outlets
Table 11 – Forces to be applied to tabs
Table 12 – Relationship between tab size and maximum current
40 Table 13 – Forces to be applied to covers, cover-plates or actuating members whose fixing is not dependent on screws
42 Table 14 – External cable dimension limits for surface-type socket-outlets
45 14 Construction of plugs
50 15 Interlocked socket-outlets
16 Resistance to ageing, protection provided by enclosures, and resistance to humidity
16.1 Resistance to ageing
51 16.2 Protection provided by enclosures
52 16.3 Resistance to humidity
53 17 Insulation resistance and electric strength
54 18 Operation of earthing contacts
55 19 Temperature rise
56 Table 15 – Nominal cross-sectional areas of copper conductorsand test currents for the temperature rise test
58 20 Breaking capacity
59 21 Normal operation
60 22 Force necessary to withdraw the plug
22.1 General
61 22.2 Verification of the maximum withdrawal force for socket-outlets
22.3 Verification of the minimum withdrawal force
62 23 Flexible cables and their connection
Table 16 – Maximum and minimum withdrawal force for plugs and socket-outlets
Table 17 – External dimensions of flexible cables to be accommodated by cord anchorages
63 Table 18 – Torque test values for cord anchorages
64 Table 19 – Maximum dimensions of flexible cables to be accommodated in rewirable accessories
65 24 Mechanical strength
67 Table 20 – Height of fall for impact tests
70 Table 21 – Torque test values for glands
74 25 Resistance to heat
Table 22 – Resistance to heat of different types or parts of accessories
75 26 Screws, current-carrying parts and connections
77 27 Creepage distances, clearances and distances through sealing compound
78 Table 23 – Creepage distances, clearances and distances throughinsulating sealing compound
79 28 Resistance of insulating material to abnormal heat and to fire
80 29 Resistance to rusting
82 Figures
Figure 1 – Examples of accessories
105 Figure 30 – Test procedures for normal operation (see Clause 21)
106 Figure 31 – Clamping unit for the temperature rise test of Clause 19
107 Figure 32 – The profile of the inrush current for the test of Clause 20
Figure 33 – Annex to Figure 32 with additional information on a possiblecircuit to produce the inrush current as given in Figure 32
108 Figure 34 – Circuit diagram for testing socket-outlets and plugs according to 18.2
Figure 35 – Possible test setup for the temperature rise test for Clauses 19 and 21
109 Annex A (normative) Safety-related routine tests for factory-wired accessories (protection against electric shock and correct polarity)
A.1 General remarks
A.2 Polarized systems, “+” and “−” – correct connection
110 A.3 Earth continuity
A.4 Short-circuit/wrong connection and reduction of creepage distanceand clearances between “+” and “−” to earth ()
111 Annex B (normative) Survey of specimens needed for tests
Table B.1 – Number of specimens needed for the tests according to 5.5
112 Annex C (informative) Alternative gripping tests
C.1 Gripping test C1
113 Figure C.1 – Reference plug for gripping test
114 C.2 Gripping test C2
Figure C.2 – Example of the test apparatus for plug gripping test
116 Annex D (normative) Standard sheets and gauges
D.1 Standard sheets
117 Figure D.1 – Standard sheet 1: 2,6 kW / 294 V to 400 V d.c. socket-outlet for class I equipment
118 Figure D.2 – Standard sheet 2: 2,6 kW / 294 V to 400 V d.c. plug for class I equipment
119 Figure D.3 – Standard sheet 3: positioning of the “+” and “−” pins/socket-contacts
120 D.2 Gauges for checking the dimensions of the entry holes
Figure D.4 – Minimum gauges for checking the dimensions of the entry holes: C1
Figure D.5 – Maximum gauges for checking the dimensions of the entry holes: C2
121 Figure D.6 – Gauge for checking the first point of contact: C3
Figure D.7 – Gauges for checking the minimum withdrawal force (see 22.3)
122 Figure D.8 – Gauge for checking the maximum withdrawal force: C4max (see 22.2)
123 Bibliography

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BSI PD IEC/TS 62735-1:2015
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