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BSI PD IEC TS 60947-7-5:2021

BSI PD IEC TS 60947-7-5:2021

$167.15

Low-voltage switchgear and controlgear – Ancillary equipment. Terminal blocks for aluminium conductors

Published By Publication Date Number of Pages
BSI 2021 34
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This part of IEC 60947 specifies requirements for terminal blocks with screw-type or screwlesstype clamping units primarily intended for industrial or similar use and to be fixed to a support to provide electrical and mechanical connection. This document can be used for terminal blocks for connection between aluminium conductors or aluminium to copper conductors. It applies to terminal blocks intended to connect round conductors, with or without special preparation, having a cross-section between 2,5 mm2 and 300 mm2 (AWG 12 to 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.

This document can be used as a guide to qualify terminal blocks for conductors out of aluminium not complying with IEC 60228 (e.g. smaller than 10 mm2, flexible or other materials). This document can also be used as a guide to qualify other types of terminal blocks for conductors out of aluminium other than feed through terminal blocks (e.g. partially insulated terminal blocks).

NOTE 1 AWG is the abbreviation of “American Wire Gage” (Gage (US) = Gauge (UK)).

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 does not apply to clamping units:

  • dedicated to any other types of switchgear and controlgear;

  • for connection by crimping, brazing, soldering or welding;

  • for data and signalling circuits;

  • for flat quick-connect terminations, insulation-piercing connecting devices and twist-on connecting devices, for which separate parts are under consideration.

NOTE 2 In case of use of special types of conductors (e.g. cladded conductors) which require a special preparation, this document can be used as a guide.

NOTE 3 In some countries, national regulation for installation rules can allow different cross-sections. For internal wiring (inside enclosures), other rules or product standards can be applicable.

NOTE 4 For connections to copper conductors only, IEC 60947-7-1:2009 is applicable.

NOTE 5 In USA, UL 1059 applies and in Canada, CSA C22.2 No. 158 applies.

Where applicable in this document, the term “clamping unit” is used instead of the term “terminal”. This is taken into account in case of reference to IEC 60947-1:2020.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 English
CONTENTS
6 FOREWORD
8 INTRODUCTION
9 1 Scope
10 2 Normative references
3 Terms and definitions
11 4 Classification
12 5 Characteristics
5.1 Summary of characteristics
5.2 Type of terminal block
5.3 Rated and limiting values
5.3.1 Rated voltage
5.3.2 Short-time withstand current
5.3.3 Standard cross-sections
13 5.3.4 Nominal cross-section
5.3.5 Nominal connecting capacity
5.3.6 Nominal current
Tables
Table 1 – Standard cross-section of conductors
14 6 Product information
6.1 Marking
6.2 Additional information
15 7 Normal service, mounting and transport conditions
8 Constructional and performance requirements
8.1 Constructional requirements
8.1.1 Clamping units
8.1.2 Mounting
8.1.3 Clearances and creepage distances
16 8.1.4 Terminal identification and marking
8.1.5 Resistance to abnormal heat and fire
8.1.6 Nominal cross-section and nominal connection capacity
17 8.2 Performance requirements
8.2.1 General
Table 2 – Range for the nominal current for metric wire sizes
18 8.2.2 Temperature-rise
8.2.3 Dielectric properties
Table 3 – Range for the nominal current for AWG or kcmil wire sizes
19 8.2.4 Short-time withstand current
8.2.5 Voltage drop
8.2.6 Electrical performance after ageing (for screwless-type terminal blocks only)
8.2.7 Current-cycle ageing test
8.3 Electromagnetic compatibility
9 Tests
9.1 Kinds of test
9.2 General
20 9.3 Verification of mechanical characteristics
9.3.1 General
9.3.2 Attachment of the terminal block on its support
21 Figures
Figure 1 – Arrangement for test according to 9.3.2
Table 4 – Attachment test parameters
22 9.3.3 Mechanical properties of clamping units
23 9.4 Verification of electrical characteristics
9.4.1 General
9.4.2 Verification of clearances and creepage distances
24 9.4.3 Dielectric tests
9.4.4 Verification of the voltage drop
25 9.4.5 Temperature-rise test
Figure 2 – Arrangement for test according to 9.4.5and for the verification of voltage drop
26 9.4.6 Short-time withstand current test
9.4.7 Ageing test (for screwless-type terminal blocks only)
9.4.8 Current-cycle ageing test
27 Figure 3 – Three-step test for AC/ DC
28 Figure 4 – Arrangement for current-cycle ageing test according to 9.4.8
29 Figure 5 – Schematic of conductor preparation(cross-section greater than 25 mm2)
30 9.5 Verification of thermal characteristics
Figure 6 – Current-cycle ageing test procedure
31 Figure 7 – Arrangement for test according to 9.5
32 9.6 Verification of EMC characteristics
9.6.1 Immunity
9.6.2 Emission
9.7 Items subject to agreement between manufacturer and user
Figure 8 – Point of test flame contact
33 Bibliography

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