GB/T 20779.2-2007Rubber for electric power safety - Part 2: Rubber for cable accessories (English PDF)

1 Scope

This section GB/T 20779 specifies the silicone rubber cable accessories for insulating and semiconducting components or (Triad) ethylene-propylene rubber

Technology-based mixture requirements.

This section applies to electrical equipment and electrical work under an electric field safety insulation and semi-conductive rubber or rubber components

Products, but does not include wire and cable insulation and the semiconductive layer of a rubber material.

2 Normative references

The following documents contain provisions which, through reference GB/T 20779 in this section constitute provisions of this section. For dated reference documents

Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section

Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section.

GB/T 20779.1-2006 power protective rubber materials - Part 1. General

3 Classification Code

Cold shrink cable accessories rubber material L

Prefabricated cable accessories rubber material Y

4 Performance

2 Tear strength N/mm >=17 >=6 >=6 >=6 >=10 >=10

Hot air aging (135 °C × 168h) after tensile properties

Tensile strength change rate

Elongation at break change rate

- - - - -30 To + 30

-30 To 30

-30 To 30

-30 To 30

After 1008h artificial climate (xenon lamp) aging tensile properties

Tensile strength change rate

Elongation at break change rate

- - - - -30 To + 30

-30 To 30

-30 To 30

-30 To 30 […]