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 mil
1 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 D2 Modification to add the following:
1.1DV.1 This standard 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, in accordance with Annex DVB, National Electrical Code, NFPA 70 (for
use in the USA), or CSA C22.1–15 Canadian Electrical Code, Part I (for use in Canada), and
NOM-001-SEDE, Electrical Installations (Utility) ([for use in Mexico]).
1.1DV.2 The wire range for terminal blocks covered by this standard include 0,051 mm2 to
1 010 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.3 The voltage range includes up to 1 500 Vac and 1 500 Vdc.
1.2 Normative references
The following referenced documents are indispensable for the application 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 60695-2-2:1991,
Fire hazard testing – Part 2: Test methods – Section 2: Needle-flame test
Amendment 1 (1994)
IEC 60947-1:1999,
Low-voltage switchgear and controlgear - Part 1: General rules
Amendment 1 (2000) Amendment 2 (2001)
ISO 4046:1978,
Paper, board, pulp and related terms – Vocabulary
1.2DV D1 Modification to add the following:
See Annex DVB for Canada, Mexico, and USA Standard References.