BS EN 50052:2016

European foreword
Introduction
1 General
2 Normal and special service conditions
3 Terms and definitions
4 Materials
5 Design
6 Manufacture and workmanship
7 Repair of casting defects
8 Thermal treatment
9 Inspection, testing and certification
10 Pressure relief devices
Annex A (informative) - A-deviations
Bibliography

Pertains to cast aluminium alloy enclosures pressurized with dry air, inert gases, for example sulphur hexafluoride or nitrogen or a mixture of such gases, used in indoor or outdoor installations of high-voltage switchgear and controlgear above 1 kV, where the gas is used principally for its dielectric and/or arc-quenching properties with rated voltages above 1 kV and up to and including 52 kV and with gas-filled compartments with design pressure higher than 300 kPa relative pressure (gauge); and with rated voltage above 52 kV.

This European Standard applies to cast aluminium alloy enclosures pressurized with dry air, inert gases, for example sulphur hexafluoride or nitrogen or a mixture of such gases, used in indoor or outdoor installations of high-voltage switchgear and controlgear above 1kV, where the gas is used principally for its dielectric and/or arc-quenching properties with rated voltages

• above 1kV and up to and including 52kV and with gas-filled enclosures with design pressure higher than 300kPa relative pressure (gauge);

• and with rated voltage above 52kV.

The enclosures comprise parts of electrical equipment not necessarily limited to the following examples:

• Circuit-breakers

• Switch-disconnectors

• Disconnectors

• Earthing switches

• Current transformers

• Voltage transformers

• Surge arrestors

• Busbars and connections

• etc.

The scope also covers enclosures of pressurized components such as the centre chamber of live tank switchgear, gas-insulated current transformers, etc.