Standards Development

Scope

This part of IEC 60947 specifies requirements for protective conductor terminal blocks (PE and PEN conductors) with screw-type or screw-less-type clamping units, primarily intended for industrial applications or similar use in circuits of a rated voltage not exceeding 1 000 V AC up to 1 000 Hz or 1 500 V DC, most commonly in conjunction with terminal blocks according to IEC 60947-7-1:2025.This document applies to:- protective conductor terminal blocks with PE function having a cross-section between 0,05 mm²/30 AWG and 150 mm²/300 kcmil and- protective conductor terminal blocks with PEN function having a cross-section between 10 mm²/ 8 AWG and 150 mm²/300 kcmil.Protective conductor terminal blocks are intended to form the electrical and mechanical connection between round copper conductors with or without special preparation and the fixing support.NOTE 1 AWG is the abbreviation of “American Wire Gage” [Gage (US) = Gauge (UK)]NOTE 1 kcmil = 1 000 cmilNOTE 1 1 cmil = 1 circular mil = surface area of a circle having a diameter of 1 milNOTE 1 1 mil = 1/1 000 inchNOTE 2 This standard can be used as a part of additional risk assessment for following product which are not covered by the scope of this standard:”NOTE 2 - protective conductor terminal blocks requiring the fixing of special devices to the conductors, for example quick connect terminations or wrapped connections, etc.;NOTE 2 - protective conductor terminal blocks providing direct contact to the conductors by means of edges or points penetrating the insulation, for example insulation displacement connections, 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 60947-1:2020.Where applicable in this standard, the term “protective conductor terminal blocks” replaces the term "terminal block" when referring to IEC 60947-7-1:2025