Residual current operated circuit-breakers for household and similar use - Part 3-3: Specific requirements for RCDs with screw-type terminals for external untreated aluminium conductors and with aluminium screw-type terminals for use with copper or with aluminium conductors

IEC 62873-3-3:2016(E) applies to RCDs equipped with screw-type terminals of copper - or of alloys containing at least 58 % of copper (if worked cold) or at least 50 % of copper (if worked otherwise), or of other metal or suitably coated metal, no less resistant to corrosion than copper and having mechanical properties no less suitable - for use with untreated aluminium conductors, or with screw-type terminals of aluminium material for use with copper or aluminium conductors.

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Status
Published
Publication Date
06-Sep-2016
Current Stage
PPUB - Publication issued
Start Date
07-Sep-2016
Completion Date
07-Sep-2016
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IEC 62873-3-3:2016 - Residual current operated circuit-breakers for household and similar use - Part 3-3: Specific requirements for RCDs with screw-type terminals for external untreated aluminium conductors and with aluminium screw-type terminals for use with copper or with aluminium conductors
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IEC 62873-3-3
Edition 1.0 2016-09
INTERNATIONAL
STANDARD
Residual current operated circuit-breakers for household and similar use –
Part 3-3: Specific requirements for RCDs with screw-type terminals for external
untreated aluminium conductors and with aluminium screw-type terminals for
use with copper or with aluminium conductors
IEC 62873-3-3:2016-09(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62873-3-3
Edition 1.0 2016-09
INTERNATIONAL
STANDARD
Residual current operated circuit-breakers for household and similar use –
Part 3-3: Specific requirements for RCDs with screw-type terminals for external
untreated aluminium conductors and with aluminium screw-type terminals for
use with copper or with aluminium conductors
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.120.50 ISBN 978-2-8322-3615-4

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 62873-3-3:2016 © IEC 2016
CONTENTS

FOREWORD ......................................................................................................................... 3

INTRODUCTION ................................................................................................................... 5

1 Scope ............................................................................................................................ 6

2 Normative references..................................................................................................... 6

3 Terms and definitions .................................................................................................... 6

4 Classification ................................................................................................................. 7

5 Characteristics of RCDs ................................................................................................. 7

6 Marking and other product information ........................................................................... 7

7 Standard conditions for operation in service and for installation ...................................... 8

8 Requirements for construction and operation .................................................................. 8

9 Tests ............................................................................................................................. 9

9.1 General ................................................................................................................. 9

9.2 Test conditions .................................................................................................... 10

9.3 Current cycling test ............................................................................................. 10

9.3.1 General ....................................................................................................... 10

9.3.2 Preparation .................................................................................................. 11

9.3.3 Test arrangement ......................................................................................... 11

9.3.4 Temperature measurement .......................................................................... 12

9.3.5 Test method and acceptance criteria ............................................................ 12

Bibliography ....................................................................................................................... 17

Figure 1 – General arrangement for the test ........................................................................ 14

Figure 2 – Test specimen example 1 ................................................................................... 15

Figure 3 – Test specimen example 2 ................................................................................... 16

Figure 4 – Test specimen example 3 ................................................................................... 16

Figure 5 – Test specimen example 4 ................................................................................... 16

Figure 6 – Test specimen example 5 ................................................................................... 16

Table 1 – Marking for terminals ............................................................................................. 8

Table 2 – Connectable cross-sections of aluminium conductors for screw-type

terminals .............................................................................................................................. 8

Table 3 – List of tests according to the material of conductors and terminals .......................... 9

Table 4 – Connectable conductors and their theoretical diameters ....................................... 10

Table 5 – Cross-sections (S) of aluminium test conductors corresponding to the rated

currents .............................................................................................................................. 10

Table 6 – Test conductor length .......................................................................................... 11

Table 7 – Equalizer and busbar dimensions ......................................................................... 12

Table 8 – Test current as a function of rated current ............................................................ 13

Table 9 – Example of calculation for determining the average temperature deviation D ....... 14

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IEC 62873-3-3:2016 © IEC 2016 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RESIDUAL CURRENT OPERATED CIRCUIT-BREAKERS
FOR HOUSEHOLD AND SIMILAR USE –
Part 3-3: Specific requirements for RCDs with screw-type terminals for
external untreated aluminium conductors and with aluminium screw-type
terminals for use with copper or with aluminium conductors
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

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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 62873-3-3 has been prepared by subcommittee 23E: Circuit

breakers and similar equipment for household use, of IEC technical committee 23: Electrical

accessories.
The text of this standard is based on the following documents:
FDIS Report on voting
23E/966/FDIS 23E/984/RVD

Full information on the voting for the approval of this standard 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.

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– 4 – IEC 62873-3-3:2016 © IEC 2016

A list of all parts of the IEC 62873 series published under the general title Residual current

operated circuit-breakers for household and similar use 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
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
---------------------- Page: 6 ----------------------
IEC 62873-3-3:2016 © IEC 2016 – 5 –
INTRODUCTION

This document is part of the series described in the outline document IEC 62873-1.

---------------------- Page: 7 ----------------------
– 6 – IEC 62873-3-3:2016 © IEC 2016
RESIDUAL CURRENT OPERATED CIRCUIT-BREAKERS
FOR HOUSEHOLD AND SIMILAR USE –
Part 3-3: Specific requirements for RCDs with screw-type terminals for
external untreated aluminium conductors and with aluminium screw-type
terminals for use with copper or with aluminium conductors
1 Scope

This part of IEC 62873 applies to RCDs equipped with screw-type terminals of copper – or of

alloys containing at least 58 % of copper (if worked cold) or at least 50 % of copper (if worked

otherwise), or of other metal or suitably coated metal, no less resistant to corrosion than

copper and having mechanical properties no less suitable – for use with untreated aluminium

conductors, or with screw-type terminals of aluminium material for use with copper or

aluminium conductors.

This part of IEC 62873 cannot be used alone but it is intended to be applied together with an

RCD product standard (IEC 61008-1 or IEC 61009-1) if an RCD is equipped with screw-type

terminals for external untreated aluminium conductors and with aluminium screw-type

terminals for use with copper or with aluminium conductors.

In this part of IEC 62873, copper-clad and nickel-clad aluminium conductors are considered

as aluminium conductors.

NOTE In AT, AU and DE, the use of aluminium screw-type terminals for use with copper conductors is not

allowed.
– In AT and DE, terminals for aluminium conductors only are not allowed;

– In ES, the use of aluminium conductors is not allowed for final circuits in household and similar installations

e.g. offices, shops;
– In DK, the minimum cross-sectional area for aluminium conductors is 16 mm .
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any
amendments) applies.

IEC 61008-1, Residual current operated circuit-breakers without integral overcurrent

protection for household and similar uses (RCCBs) – Part 1: General rules

IEC 61009-1, Residual current operated circuit-breakers with integral overcurrent protection

for household and similar uses (RCBOs) – Part 1: General rules

IEC 62873-2, Residual current operated circuit-breakers for household and similar use –

Part 2: Residual current devices (RCDs) – Vocabulary
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 62873-2 and the

following apply.
---------------------- Page: 8 ----------------------
IEC 62873-3-3:2016 © IEC 2016 – 7 –
3.1
treated conductor

contact area of a conductor that has had its oxide layer on the outside strands scraped away

and/or has had a compound added to improve connectability and/or prevent corrosion

3.2
untreated conductor
unprepared conductor

conductor which has been cut and the insulation of which has been removed for insertion into

a terminal

Note 1 to entry: A conductor, the shape of which is arranged for introduction into a terminal or the strands of

which are twisted to consolidate the end, is considered to be an unprepared conductor.

[SOURCE: IEC 60050-442:1998, 442-01-26]
3.3
equalizer

arrangement used in the test loop to ensure an equipotentiality point and uniform current

density in a stranded conductor, without adversely affecting the temperature of the

conductor(s)
3.4
reference conductor

continuous length of the same type and size conductor as that used in the terminal unit under

test and connected in the same series circuit, which enables the reference temperature and,

if required, reference resistance to be determined
3.5
stability factor

measure of temperature stability of a terminal unit during the current cycling test

4 Classification
Clause 4 of the RCD product standard applies.
5 Characteristics of RCDs
Clause 5 of the RCD product standard applies.
6 Marking and other product information

In addition to Clause 6 of the RCD product standard, the following requirements apply.

The terminal marking defined in Table 1 shall be marked on the RCD, near the terminals.

The other information concerning the number of conductors, the screw torque values (if

different from Table 11 of the RCD product standard) and the cross-sections
...

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