SIST EN IEC 60947-7-4:2019

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Niederspannungsschaltgeräte - Teil 7-4: Hilfseinrichtungen - Leiterplatten-Anschlussklemmen für Kupferleiter (IEC 60947-7-4:2019)Appareillage à basse tension - Partie 7-4: Matériels accessoires - Blocs de jonction pour cartes de circuits imprimés pour conducteurs en cuivre (IEC 60947-7-4:2019)Low-voltage switchgear and controlgear - Part 7-4: Ancillary equipment - PCB terminal blocks for copper conductors (IEC 60947-7-4:2019)31.180SORãþHPrinted circuits and boards29.130.20Nizkonapetostne stikalne in krmilne napraveLow voltage switchgear and controlgearICS:Ta slovenski standard je istoveten z:EN IEC 60947-7-4:2019SIST EN IEC 60947-7-4:2019en01-maj-2019SIST EN IEC 60947-7-4:2019SLOVENSKI
STANDARDSIST EN 60947-7-4:20141DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN IEC 60947-7-4
March 2019 ICS 29.130.20
Supersedes
EN 60947-7-4:2013
English Version
Low-voltage switchgear and controlgear - Part 7-4: Ancillary equipment - PCB terminal blocks for copper conductors (IEC 60947-7-4:2019)
Appareillage à basse tension - Partie 7-4: Matériels accessoires - Blocs de jonction pour cartes de circuits imprimés pour conducteurs en cuivre (IEC 60947-7-4:2019)
Niederspannungsschaltgeräte - Teil 7-4: Hilfseinrichtungen - Leiterplatten-Anschlussklemmen für Kupferleiter (IEC 60947-7-4:2019) This European Standard was approved by CENELEC on 2019-02-22. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung CEN-CENELEC Management Centre: Rue de la Science 23,
B-1040 Brussels © 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60947-7-4:2019 E SIST EN IEC 60947-7-4:2019

This document supersedes EN 60947-7-4:2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice The text of the International Standard IEC 60947-7-4:2019 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60512-2-1 NOTE Harmonized as EN 60512-2-1 IEC 60512-5-1 NOTE Harmonized as EN 60512-5-1 IEC 60512-9-5:2010 NOTE Harmonized as EN 60512-9-5:2010 (not modified) IEC 60664-1:2007 NOTE Harmonized as EN 60664-1:2007 (not modified) IEC 60695-10-2 NOTE Harmonized as EN 60695-10-2 IEC 60695-11-5 NOTE Harmonized as EN 60695-11-5 IEC 60947-7-1:2009 NOTE Harmonized as EN 60947-7-1:2009 (not modified) IEC 60998-1:2002 NOTE Harmonized as EN 60998-1:2004
IEC 61984 NOTE Harmonized as EN 61984
Normative references to international publications with their corresponding European publications The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1
Where an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.
NOTE 2
Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu.
Publication Year Title EN/HD Year IEC 60068-2-20 -
Environmental testing - Part 2-20: Tests - Test T: Test methods for solderability and resistance to soldering heat of devices with leads EN 60068-2-20 -
IEC 60352-1 -
Solderless connections - Part 1: Wrapped connections - General requirements, test methods and practical guidance EN 60352-1 -
IEC 60352-2 -
Solderless connections - Part 2: Crimped connections - General requirements, test methods and practical guidance EN 60352-2 -
IEC 60352-3 -
Solderless connections - Part 3: Solderless accessible insulation displacement connections - General requirements, test methods and practical guidance EN 60352-3 -
IEC 60352-4 -
Solderless connections - Part 4: Solderless non-accessible insulation displacement connections - General requirements, test methods and practical guidance EN 60352-4 -
IEC 60352-5 -
Solderless connections - Part 5: Press-in connections - General requirements, test methods and practical guidance EN 60352-5 -
IEC 60352-6 -
Solderless connections - Part 6: Insulation piercing connections - General requirements, test methods and practical guidance EN 60352-6 -
IEC 60352-7 -
Solderless connections - Part 7: Spring clamp connections - General requirements, test methods and practical guidance EN 60352-7 -
IEC 60512-2-2 2003
Connectors for electronic equipment - Tests and measurements - Part 2-2: Electrical continuity and contact resistance tests - Test 2b: Contact resistance - Specified test current method EN 60512-2-2 2003
Connectors for electronic equipment - Tests and measurements - Part 4-1: Voltage stress tests - Test 4a: Voltage proof EN 60512-4-1 -
IEC 60512-5-2 2002
Connectors for electronic equipment - Tests and measurements - Part 5-2: Current-carrying capacity tests - Test 5b: Current-temperature derating EN 60512-5-2 2002
IEC 60512-11-7 -
Connectors for electronic equipment - Tests and measurements - Part 11-7: Climatic tests - Test 11g: Flowing mixed gas corrosion test EN 60512-11-7 -
IEC 60512-11-9 -
Connectors for electronic equipment - Tests and measurements - Part 11-9: Climatic tests - Test 11i: Dry heat EN 60512-11-9 -
IEC 60512-11-10 -
Connectors for electronic equipment - Tests and measurements - Part 11-10: Climatic tests - Test 11j: Cold EN 60512-11-10 -
IEC 60695-2-10 -
Fire hazard testing - Part 2-10: Glowing/hot-wire based test methods - Glow-wire apparatus and common test procedure EN 60695-2-10 -
IEC 60695-2-11 -
Fire hazard testing - Part 2-11: Glowing/hot-wire based test methods - Glow-wire flammability test method for end-products (GWEPT) EN 60695-2-11 -
IEC 60695-2-12 -
Fire hazard testing - Part 2-12: Glowing/hot-wire based test methods - Glow-wire flammability index (GWFI) test method for materials EN 60695-2-12 -
IEC 60695-2-13 -
Fire hazard testing - Part 2-13: Glowing/hot-wire based test methods - Glow-wire ignition temperature (GWIT) test method for materials EN 60695-2-13 -
IEC 60947-1 2007
Low-voltage switchgear and controlgear - Part 1: General rules EN 60947-1 2007
+ A1 2010
+ A1 2011
+ A2 2014
+ A2 2014
IEC 60998-2-3 -
Connecting devices for low-voltage circuits for household and similar purposes - Part 2-3: Particular requirements for connecting devices as separate entities with insulation-piercing clamping units EN 60998-2-3 -
IEC 60999-1 -
Connecting devices - Electrical copper conductors - Safety requirements for screw-type and screwless-type clamping units - Part 1: General requirements and particular requirements for clamping units for conductors from 0,2 mm2 up to 35 mm2 (included) EN 60999-1 -
IEC 60999-2 -
Connecting devices - Electrical copper conductors - Safety requirements for screw-type and screwless-type clamping units - Part 2: Particular requirements for clamping units for conductors above 35 mm2 up to 300 mm2 (included) EN 60999-2 -
IEC 61210 -
Connecting devices - Flat quick-connect terminations for electrical copper conductors - Safety requirements EN 61210 -
Carbonaceous materials for the production of aluminium - Pitch for electrodes - Determination of coking value - -
IEC 60947-7-4 Edition 2.0 2019-01 INTERNATIONAL STANDARD NORME INTERNATIONALE Low-voltage switchgear and controlgear –
Part 7-4: Ancillary equipment – PCB terminal blocks for copper conductors
Appareillage à basse tension –
Partie 7-4: Matériels accessoires – Blocs de jonction pour cartes de circuits imprimés pour conducteurs en cuivre
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE
ICS 29.130.20
ISBN 978-2-8322-6402-7
– 2 – IEC 60947-7-4:2019  IEC 2019 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope . 7 2 Normative references . 7 3 Terms and definitions . 9 4 Classification . 10 5 Characteristics . 10 5.1 Summary of characteristics . 10 5.2 Type of PCB terminal block . 10 5.3 Rated and limiting values . 10 5.3.1 Rated voltages . 10 5.3.2 Rated current . 11 5.3.3 Standard cross-sections . 11 5.3.4 Maximum cross-section . 12 5.3.5 Connecting capacity . 12 6 Product information . 13 6.1 Marking . 13 6.2 Additional information . 13 7 Normal service, mounting and transport conditions . 13 8 Constructional and performance requirements . 13 8.1 Constructional requirements . 13 8.1.1 Clamping units . 13 8.1.2 Mounting and installation . 14 8.1.3 Clearances and creepage distances . 14 8.1.4 Terminal identification and marking . 14 8.1.5 Resistance to abnormal heat and fire . 15 8.1.6 Maximum cross-section and connecting capacity . 15 8.2 Performance requirements . 15 8.2.1 Temperature-rise (current-temperature derating) . 15 8.2.2 Dielectric properties . 15 8.2.3 Short-time withstand current . 15 8.2.4 Contact resistance . 16 8.2.5 Ageing tests . 16 8.3 Electromagnetic compatibility (EMC) . 16 9 Tests . 16 9.1 Kinds of test . 16 9.2 General . 16 9.3 Verification of mechanical characteristics . 17 9.3.1 General . 17 9.3.2 Attachment of the PCB terminal block on its support . 17 9.3.3 Vacant . 18 9.3.4 Verification of the maximum cross-section and connecting capacity . 18 9.3.5 Verification of maximum cross-section (special test with gauges) . 18 9.4 Verification of electrical characteristics . 19 9.4.1 General . 19 SIST EN IEC 60947-7-4:2019

IEC 60947-7-4:2019  IEC 2019 – 3 –
9.4.2 Verification of clearances and creepage distances . 19 9.4.3 Dielectric tests . 19 9.4.4 Verification of contact resistance . 20 9.4.5 Temperature-rise test (current-temperature derating) . 22 9.4.6 Short-time withstand current test . 24 9.4.7 Ageing tests . 25 9.5 Verification of thermal characteristics. 29 9.6 Verification of EMC characteristics . 30 9.6.1 General . 30 9.6.2 Immunity . 30 9.6.3 Emission . 30 Annex A (informative)
Structure of a PCB terminal block . 31 Annex B (informative)
Additional information to be specified between the manufacturer and the user . 32 B.1 Additional information available on request of the user . 32 B.2 Information for testing in addition to those mentioned above . 32 Annex C (informative)
Examples of PCBs and PCB terminal blocks for high-current application . 33 C.1 Layout of high-current PCBs (schematic diagram) . 33 C.2 High-current PCB terminal blocks . 34 Bibliography . 35
Figure 1 – Test assembly for the measurement of contact resistance and temperature-rise . 22 Figure 2 – Example of wiring structure of a multi-tier PCB terminal block . 23 Figure 3 – Test assembly for the measurement
of short-time withstand current . 25 Figure 4 – Test sequence . 26 Figure 5 – Test sequence for PCB terminal blocks with contact pressure via insulating material . 27 Figure 6 – Current cycling ageing test procedure . 29 Figure A.1 – Structure of a PCB terminal block . 31 Figure C.1 – Structure of a high current PCB . 33 Figure C.2 – PCB terminal block with soldered connection to the PCB . 34 Figure C.3 – PCB terminal block with screwed connection to the PCB . 34
Table 1 – Standard cross-sections of copper conductors . 11 Table 2 – Relationship between maximum cross-section
and connecting capacity of PCB terminal blocks. 12 Table 3 – Standards for clamping units and connecting methods . 14 Table 4 – Tightening torques for PCB terminal blocks with screw-type clamping units . 18 Table 5 – Impulse withstand test voltages . 20 Table 6 – Dielectric test voltages corresponding to the rated insulation voltage . 20 Table 7 – Length of connectable conductors and conductor loops . 23 Table 8 – Examples of cross-sectional distribution
of interconnections on printed circuit boards . 24
– 4 – IEC 60947-7-4:2019  IEC 2019 INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 7-4: Ancillary equipment –
PCB terminal blocks for copper conductors
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. International Standard IEC 60947-7-4 has been prepared by subcommittee 121A: Low-voltage switchgear and controlgear, of IEC technical committee 121: Switchgear and controlgear and their assemblies for low voltage. This second edition cancels and replaces the first edition published in 2013. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) additional test for PCB terminal blocks with clamping units, where contact pressure is transmitted through insulating materials; b) tightening torques for screws now given in Table 4 of this document (previously given in Table 4 of IEC 60947-1:2007); tightening torques added for an additional type of screw; c) new criteria for verification of contact resistance introduced; SIST EN IEC 60947-7-4:2019

IEC 60947-7-4:2019  IEC 2019 – 5 –
d) clarification in the description of the temperature-rise test (current-temperature derating); corrections in the test sequence according to Figure 4. The text of this International Standard is based on the following documents: FDIS Report on voting 121A/255/FDIS 121A/265/RVD
Full information on the voting for the approval of this International Standard can be found in the report on voting indicated in the above table. This document has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts in the IEC 60947 series, published under the general title Low-voltage switchgear and controlgear, 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.
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.
– 6 – IEC 60947-7-4:2019  IEC 2019 INTRODUCTION This document covers not only the terminal block requirements in accordance with the IEC 60947-7 series but also takes into account the specifications of connectors in accordance with IEC 61984 as the requirements for both components are highly similar owing to equivalent applications.
IEC 60947-7-4:2019  IEC 2019 – 7 –
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 7-4: Ancillary equipment –
PCB terminal blocks for copper conductors
1 Scope This part of IEC 60947-7 specifies requirements for PCB terminal blocks primarily intended for industrial or similar use. Mounting and fixing on the printed circuit board is made by soldering, press-in or equivalent methods to provide electrical and mechanical connection between copper conductors and the printed circuit board. This document applies to PCB terminal blocks intended to connect copper conductors, with or without special preparation, having a cross-section between 0,08 mm2 and 300 mm2 (AWG 28-600 kcmil), intended to be used in circuits of a rated voltage not exceeding 1 000 V AC up to 1 000 Hz or 1 500 V DC. NOTE 1 Large-cross-section terminal blocks are dedicated to the specific design of high-current PCBs. The range up to 300 mm2 is kept to cover any possible application. Examples of high current PCBs and PCB terminal blocks are shown in Annex C. NOTE 2 AWG is the abbreviation of “American Wire Gage” (Gage (US) = Gauge (UK)). 1 kcmil = 1 000 cmil; 1 cmil = 1 circular mil = surface of a circle having a diameter of 1 mil; 1 mil = 1/1 000 inch. This document can be used as a guide for special types of PCB terminal blocks with components, such as disconnect units, integrated cartridge fuse-links and the like or with other dimensions of conductors. If applicable, in this document the term “clamping unit” is used instead of “terminal”. This is taken into account in the case of references to IEC 60947-1. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60068-2-20, Environmental testing – Part 2-20: Tests – Test T: Test methods for solderability and resistance to soldering heat of devices with leads IEC 60352-1, Solderless connections – Part 1: Wrapped connections – General requirements, test methods and practical guidance IEC 60352-2, Solderless connections – Part 2: Crimped connections – General requirements, test methods and practical guidance SIST EN IEC 60947-7-4:2019

– 8 – IEC 60947-7-4:2019  IEC 2019 IEC 60352-3, Solderless connections – Part 3: Solderless accessible insulation displacement connections – General requirements, test methods and practical guidance IEC 60352-4, Solderless connections – Part 4: Solderless non-accessible insulation displacement connections – General requirements, test methods and practical guidance IEC 60352-5, Solderless connections – Part 5: Press-in connections – General requirements, test methods and practical guidance IEC 60352-6, Solderless connections – Part 6: Insulation piercing connections – General requirements, test methods and practical guidance IEC 60352-7, Solderless connections – Part 7: Spring clamp connections – General requirements, test methods and practical guidance IEC 60512-2-2:2003, Connectors for electronic equipment – Tests and measurements –
Part 2-2: Electrical continuity and contact resistance tests – Test 2b: Contact resistance –Specified test current method IEC 60512-4-1, Connectors for electronic equipment – Tests and measurements – Part 4-1: Voltage stress tests – Test 4a: Voltage proof IEC 60512-5-2:2002, Connectors for electronic equipment – Tests and measurements –
Part 5-2: Current-carrying capacity tests – Test 5b: Current-temperature derating IEC 60512-11-7, Connectors for electronic equipment – Tests and measurements – Part 11-7: Climatic tests – Test 11g: Flowing mixed gas corrosion test IEC 60512-11-9, Connectors for electronic equipment – Tests and measurements – Part 11-9: Climatic tests – Test 11i: Dry heat IEC 60512-11-10, Connectors for electronic equipment – Tests and measurements –
Part 11-10: Climatic tests – Test 11j: Cold IEC 60695-2-10, Fire hazard testing – Part 2-10: Glowing/hot-wire based test methods – Glow-wire apparatus and common test procedure IEC 60695-2-11, Fire hazard testing – Part 2-11: Glowing/hot-wire based test methods – Glow-wire flammability test method for end-products (GWEPT) IEC 60695-2-12, Fire hazard testing – Part 2-12: Glowing/hot-wire based test methods – Glow-wire flammability index (GWFI) test method for materials IEC 60695-2-13, Fire hazard testing – Part 2-13: Glowing/hot-wire based test methods – Glow-wire ignition temperature (GWIT) test method for materials IEC 60947-1:2007, Low-voltage switchgear and controlgear – Part 1: General rules
IEC 60947-1:2007/AMD1:2010 IEC 60947-1:2007/AMD2:2014 IEC 60998-2-3, Connecting devices for low-voltage circuits for household and similar purposes – Part 2-3: Particular requirements for connecting devices as separate entities with insulation-piercing clamping units SIST EN IEC 60947-7-4:2019

IEC 60947-7-4:2019  IEC 2019 – 9 –
IEC 60999-1, Connecting devices – Electrical copper conductors – Safety requirements for screw-type and screwless-type clamping units – Part 1: General requirements and particular requirements for clamping units for conductors from 0,2 mm2 up to 35 mm2 (included) IEC 60999-2, Connecting devices – Electrical copper conductors – Safety requirements for screw-type and screwless-type clamping units – Part 2: Particular requirements for clamping units for conductors above 35 mm2 up to 300 mm2 (included) IEC 61210, Connecting devices – Flat quick-connect terminations for electrical copper conductors – Safety requirements ISO 6988, Metallic and other non-organic coatings – Sulfur dioxide test with general condensation of moisture 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp 3.1
printed circuit board PCB piece of insulating material with fixed metal traces to connect electronic components Note 1 to entry: Printed circuit boards are typically subdivided according to: • their structure (e.g. single- and double-sided, multilayers); • the nature of the base material (e.g. rigid, flexible). Note 2 to entry: This note applies to the French language only. 3.2
PCB terminal block part intended to be mounted on a printed circuit board and carrying one or more mutually insulated contact units and which provides an electrical and mechanical connection between copper conductor and printed circuit board 3.3
rated current current value assigned by the manufacturer, which the PCB terminal block can carry continuously (without interruption) and simultaneously through all its poles connected with the maximum cross-section, preferably at an ambient temperature of 40 °C, without the upper limiting temperature being exceeded 3.4
contact unit conductive part establishing the connection between printed circuit board and connectable conductor(s) Note 1 to entry: See Annex A for description of the structure of a PCB terminal block. SIST EN IEC 60947-7-4:2019

– 10 – IEC 60947-7-4:2019  IEC 2019 3.5
upper limiting temperature ULT maximum temperature assigned by the manufacturer in the PCB terminal block as outcome (sum) of the ambient temperature and the temperature-rise due to current flow, at which the PCB terminal block is intended to be still operable Note 1 to entry: This note applies to the French language only. 3.6
lower limiting temperature LLT minimum temperature of a PCB terminal block assigned by the manufacturer, at which a PCB terminal block is intended to operate Note 1 to entry: This note applies to the French language only. 4 Classification A distinction is made between various types of PCB terminal blocks, if applicable, as follows: a) type of clamping unit (see 8.1.1); b) ability to accept prepared conductors (see 2.3.28 of IEC 60947-1:2007/AMD1:2010); c) type of electrical contact to the printed circuit board; d) type of mechanical fastening to the printed circuit board; e) number of poles; f) pitch (centre to centre pin spacing); g) contact unit with identical or dissimilar clamping units; h) number of clamping units on each contact unit; i) service conditions. 5 Characteristics 5.1 Summary of characteristics The characteristics of a PCB terminal block are as follows: • type of PCB terminal block (see 5.2); • rated and limiting values (see 5.3). 5.2 Type of PCB terminal block The following shall be stated: • type of clamping units (see 8.1.1); • type of contacting on the printed circuit board; • number of clamping units. 5.3 Rated and limiting values 5.3.1 Rated voltages Subclauses 4.3.1.2 and 4.3.1.3 of IEC 60947-1:2007 apply. SIST EN IEC 60947-7-4:2019

IEC 60947-7-4:2019  IEC 2019 – 11 –
5.3.2 Rated current Verification of the rated current specified by the manufacturer is carried out in accordance with 9.4.5. If an ambient temperature other than 40 °C is used for the definition of the rated current, the manufacturer should state, in the technical documentation, the ambient temperature on which the rating is based, with reference, if appropriate, to the derating curve defined in IEC 60512-5-2. The derating curve is obtained by applying a reduction factor of 0,8 in accordance with IEC 60512-5-2. If another reduction factor is used, this shall be stated in the technical documentation. 5.3.3 Standard cross-sections The standard values for cross-sections of copper conductors to be used are given in Table 1. Table 1 – Standard cross-sections of copper conductors Metric size ISO Comparison between AWG/kcmil and metric sizes Size Equivalent metric area mm2 AWG/kcmil mm2 0,05 a 30 a 0,05 a 0,08 28 0,08 0,14 26 0,13 0,2 24 0,205 0,34 22 0,324 0,5 20 0,519 0,75 18 0,82 1 – – 1,5 16 1,3 2,5 14 2,1 4 12 3,3 6 10 5,3 10 8 8,4 16 6 13,3 25 4 21,2 35 2 33,6 50 0 53,5 70 00 67,4 95 000 85 – 0000 107,2 120 250 (kcmil) 127 150 300 (kcmil) 152 185 350 (kcmil) 177 240 500 (kcmil) 253 300 600 (kcmil) 304 a Outside the scope of this document and included for information only.
– 12 – IEC 60947-7-4:2019  IEC 2019 5.3.4 Maximum cross-section The maximum cross-section shall be selected from the standard cross-sections given
in Table 1. 5.3.5 Connecting capacity For PCB terminal blocks with a maximum cross-section between 0,08 mm2 and 35 mm2 inclusive, the minimum range contained in Table 2 applies. The conductors may be rigid (solid or stranded) or flexible. The manufacturer shall state the types and the maximum and minimum cross-sections of conductors that can be connected and, if applicable, the number of conductors simultaneously connectable to each clamping unit. The manufacturer shall also state any necessary preparation of the end of the conductor. Table 2 – Relationship between maximum cross-section
and connecting capacity of PCB terminal blocks Maximum cross-section Connecting capacity mm2 AWG/kcmil mm2 AWG 0,05 a 30 a 0,05 a 30 a 0,08 28
0,05 – 0,08
30 – 28 0,14 26 0,05 – 0,08 – 0,14 30 – 28 – 26 0,2 24 0,08 – 0,14 – 0,2 28 – 26 – 24 0,34 22 0,14 – 0,2 – 0,34 26 – 24 – 22 0,5 20 0,2 – 0,34 – 0,5 24 – 22 – 20 0,75 18 0,34 – 0,5 – 0,75 22 – 20 – 18 1 – 0,5 – 0,75 – 1
–
1,5 16 0,75 – 1 – 1,5 20 – 18 – 16 2,5 14 1 – 1,5 – 2,5 18 – 16 – 14 4 12 1,5 – 2,5 – 4 16 – 14 – 12 6 10 2,5 – 4 – 6 14 – 12 – 10 10 8 4 – 6 – 10 12 – 10 – 8 16 6 6 – 10 – 16 10 – 8 – 6 25 4 10 – 16 – 25 8 – 6 – 4 35 2 16 – 25 – 35 6 – 4 – 2 50 0 25 – 35 – 50 4 – 2 – 0 70 00 35 – 50 – 70 2 – 0 – 00 95 000 50 – 70 – 95 0 – 00 – 000 – 0000 – 00 – 000 – 0000 120 250 70 – 95 – 120 000 – 0000 – 250 150 300 95 – 120 – 150 0000 – 250 – 300 185 350 120 – 150 – 185 250 – 300 – 350 – 400 – 300 – 350 – 400 240 500 150 – 185 – 240 350 – 400 – 500 300 600 185 – 240 – 300 400 – 500 – 600 a Outside the scope of this document and included for information only.
IEC 60947-7-4:2019  IEC 2019 – 13 –
6 Product information 6.1 Marking A PCB terminal block shall be marked in a durable and legible manner with the following: a) the name of the manufacturer or a trade mark by which the manufacturer can be readily identified; b) a type reference permitting its identification in order to obtain relevant information from the manufacturer or their catalogue. Very small PCB terminal blocks with a surface that cannot be marked shall be marked only in accordance with a). In those cases, all specified information shall be marked on the smallest packing unit. 6.2 Additional information The following information shall be stated by the manufacturer, if applicable, e.g. in the manufacturer's data sheet or their catalogue or on the packing unit: a) IEC 60947-7-4, if the manufacturer claims compliance with this document; b) the maximum cross-section; c) the connecting capacity, if different from Table 2, including the number of conductors simultaneously connectable; d) the rated current and the reduction factor to determine the derating curve if different from 0,8; NOTE Unless otherwise specified, the rated current is preferably determined on four-pole contact units. e) the rated insulation voltage (Ui); f) the rated impulse withstand voltage (Uimp), when determined; g) service conditions, if different from those stated in Clause 7; h) special preparation of the end of the conductor; i) additional information to be specified stated in Annex B, if applicable. 7 Normal service, mounting and transport conditions Clause 6 of IEC 60947-1:2007/AMD2:2014 applies. 8 Constructional and performance requirements 8.1 Constructional requirements 8.1.1 Clamping units The clamping units shall allow the conductors to be connected by means ensuring that a reliable mechanical linkage and electrical contact is properly maintained. In addition, the test described in 9.4.7.3 shall be performed if contact pressure of the clamping unit is transmitted through insulating material. If this contact pressure is transmitted purely via ceramic or pure mica, the test according to 9.4.7.3 is not deemed necessary. Clamping units and connecting methods listed in Table 3 fulfil the mechanical requirements of this document. Additional requirements are given in this document. SIST EN IEC 60947-7-4:2019

– 14 – IEC 60947-7-4:2019  IEC 2019 Other terminations and connection methods shall be tested in accordance with the relevant standards. Table 3 – Standards for clamping units and connecting methods Ref. Clamping units and connecting methods Reference standards a) Screw-type clamping unit IEC 60999-1 or IEC 60999-2 b) Screwless-type clamping unit IEC 60999-1 or IEC 60999-2 or IEC 60352-7 c) Wrapped connection IEC 60352-1 d) Crimped connection IEC 60352-2 e) Insulation displacement connection (accessible) IEC 60352-3 or IEC 60998-2-3 f) Insulation displacement connection
(non accessible) IEC 60352-4 or IEC 60998-2-3 g) Press-in connection IEC 60352-5 h) Insulation piercing connection IEC 60352-6 or IEC 60998-2-3 i) Flat quick-connect termination IEC 61210 j) Soldered connection IEC 60068-2-20 a NOTE The relevant standard applies for the preconditioning of prepared conductors. a The test method selected shall be stated in the test report.
8.1.2 Mounting and installation PCB terminal blocks shall be so designed that safe mounting on a printed circuit board is possible by means of soldering, pressing-in, screwing, etc. The connection to the printed circuit board shall not be damaged by connecting the conductors. Tests shall be carried out in accordance with 9.3.2. 8.1.3 Clearances and creepage distances For PCB terminal blocks for which the manufacturer has stated values of rated impulse withstand voltage (Uimp) and rated insulation voltage (Ui), minimum values of clearances and creepage distances are given in Table 13 of IEC 60947-1:2007 and Table 15 of IEC 60947-1:2007/AMD1:2010. For PCB terminal blocks for which the manufacturer has not declared a value of rated impulse withstand voltage (Uimp), guidance for minimum values is given in Annex H of IEC 60947-1:2007. Electrical requirements are given in 8.2.2. 8.1.4 Terminal identification and marking Subclause 7.1.8.4 of IEC 60947-1:2007 applies with the following addition. A PCB terminal block shall have provision, or at least space, for identification marks or numbers for each clamping unit or contact unit related to the circuit of which it forms a part, except when such marking is not physically possible. Such provision may consist of separate marking items, such as marking tags, identification labels, etc. SIST EN IEC 60947-7-4:2019

IEC 60947-7-4:2019  IEC 2019 – 15 –
8.1.5 Resistance to abnormal heat and fire The insulation materials of PCB terminal blocks shall not be adversely affected by abnormal heat and fire. Compliance is checked by: a) the glow-wire test on the complete product in accordance with 9.5 or b) verification of the insulating material in accordance with 1) IEC 60695-2-12, method GWFI at a temperature of 850 °C, or 2) IEC 60695-2-13, method GWIT at a temperature of 775 °C. This verification is not necessary for small parts (see IEC 60695-2-11). NOTE 1 The relevant test method is specified by the manufacturer. NOTE 2 For some applications it can be mandatory to check compliance by the glow-wire test on the complete product in accordance with 9.5 only. The need is either defined in the end-product standard or by agreement between the manufacturer and the users. See Clause B.1. 8.1.6 Maximum cross-section and connecting capacity PCB terminal blocks shall be so designed that conductors of the maximum cross-section and the connecting capacity, if applicable, can be accepted. Compliance is checked by the test described in 9.3.4. The verification of the maximum cross-section may be performed by the special test in accordance with 9.3.5. 8.2 Performance requirements 8.2.1 Temperature-rise (current-temperature derating) PCB terminal blocks shall be tested in accordance with 9.4.5. The sum of ambient temperature and temperature-rise of the PCB terminal block shall not exceed the upper limiting temperature. 8.2.2 Dielectric properties If the manufacturer has declared a value of the rated impulse withstand voltage (Uimp)
(see 4.3.1.3 of IEC 60947-1:2007), the requ
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