GB/T 3956-1997 in English

1 Scope

This standard specifies the standardized nominal cross-sectional areas from 0.5 mm2 to 2000 mm2, as well as numbers and diameters of wires and resistance values for conductors in electric cables and fiexible cords.

It does not apply to conductors for telecommunication purposes, and it applies to conductors of special design only when stated in the specification for the type of cable. Conductors of special design are, for example, conductors for pressure cables, conductors in extra-flcxible welding cables or in special types of flexible cables having the cores twisted together with unusually short lays.

2 Classlflcatlon

The conductors have been divided into four classes: 1, 2, 5 and 6

Those in Classes 1 and 2 are intended for use in cables for fixed installations, Class 1 being solid conductors and Class 2 stranded conductors.

Classes 5 and 6 are intended for use in flexible cables and cords, Class 6 bcing more flexible than Class 5.

3 Materials

The conductors may consist of:

— plain or metal-coated annealed copper; or

— plain aluminium or aluminium alloy

as specified for the different types of conductor in Clauses 4 and 5 of this standard.

The term "metal-coated”means coated with a thin layer of suitable metal, such as tin, tin alloy or lead alloy.

4 Cables for Fixed InstalIations

Foreword II
IEC Foreword III
IEC Introduction V
1 Scope
2 Classlflcatlon
3 Materials
4 Cables for Fixed InstalIations
5 Flexible Conductors (Classes 5 and 6)
6 Cheek of Compliance with Clauses 4 and 5
Annex A (Normative) Guide to the Dimensional Limits of Circular Conductors