Low-voltage switchgear and controlgear - Part 7-1: Ancillary equipment - Terminal blocks for copper conductors

UL 60947-7-1

1.1 Scope

This part of IEC 60947 specifies requirements for terminal blocks with screw-type or screw-less-type clamping units primarily intended for industrial or similar use and to be fixed to a support to provide electrical and mechanical connection between copper conductors. It applies to terminal blocks intended to connect round copper conductors, with or without special preparation, having a cross-section between 0,2 mm2 and 300 mm2 (AWG 24/600 kcmil), intended to be used in circuits of a rated voltage not exceeding 1 000 V a.c. up to 1 000 Hz or 1 500 V d.c.NOTE AWG is the abbreviation of "American Wire Gage" (Gage (US) = Gauge (UK))kcmil = 1000 cmil;1 cmil = 1 circular mil = surface of a circle having a diameter of 1 mil1 mil = 1/1000 inch

This standard may be used as a guide for- terminal blocks requiring the fixing of special devices to the conductors, for example quick connect terminations or wrapped connections, etc.;- terminal blocks providing direct contact to the conductors by means of edges or points penetrating the insulation, for example insulation displacement connections, etc.;- special types of terminal blocks, for example disconnect terminal blocks, etc.

Where applicable in this standard, the term "clamping unit" has been used instead of the term "terminal". This is taken into account in case of reference to IEC 60947-1.

1.1DV.1 Modification by adding the following:

1.1DV.1.1 This standard also applies to terminal blocks that have insulation piercing or displacement clamping units.

1.1DV.1.2 The wire range for terminal blocks covered by this standard include 0,051 mm2 to 1 1010 mm2 (30 AWG to 2 000 kcmil) copper conductors and 3,31 mm2 to 1 010 mm2 (12 AWG to 2 000 kcmil) aluminum conductors. See Annex dva for aluminum requirements.In Mexico, 3,31 mm2 (12 AWG), 5,26 mm2 (10 AWG), and 8,37 mm2 (8 AWG) aluminum conductors are not allowed.

1.1DV.1.3 The voltage range includes up to 1 500 V ac and 1 500 V dc.

1.1DV.2 Modification (Applicable for the United States):

These requirements do not cover field installed power distribution blocks intended to distribute power in a building to separate units such as apartments, separate heaters, and air conditioning units. Power distribution blocks are investigated in accordance with the Outline of Investigation for Power Distribution Blocks, Subject 1953.