BS EN 50069:1991+A1:1993 Specification for welded composite enclosures of cast and wrought aluminium alloys for gas-filled high- voltage switchgear and controlgear
This standard applies to welded composite
enclosures of cast and wrought aluminium and
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, where the gas is used
principally for its dielectric and/or arc-quenching
properties, with rated voltages.
— 1 kV and up to and including 52 kV and with
gas-filled compartments with design pressure
— and with rated voltage 72,5 kV and above.
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.
The scope covers also pressurized components such
as the centre-chamber of live tank switchgear and
controlgear, gas-insulated current transformers,
etc.
2.2 Production
The production of the enclosures shall be in
accordance with documented welding procedures
which shall be carried out by well trained and
supervised welding personnel. Where International
Standards (ISO or CEN) are not available, National
Standards may be used.
NOTE This standard will be revised as soon as possible when
ISO or CEN standards covering the various aspects are available.
2.3 Quality assurance
It is the intention of this standard, that the
switchgear manufacturer shall be responsible for
achieving and maintaining a consistent and
adequate quality of product.
Sufficient examinations shall be made by the
enclosure manufacturer to ensure that the
materials, production and testing comply in all
respects with the requirements of this standard and
ISO 6213:1983. Inspection by the user’s inspectors
shall not absolve the switchgear manufacturer from
his responsibility to exercise such quality assurance
procedures as to ensure that the requirements and
the intent of this standard are satisfied.
NOTE Reference should be made to the ISO 9000 series of
standards for quality assurance systems.
BS EN 50069:1991+A1:1993 history
2018BS EN 50069:2018 High-voltage switchgear and controlgear. Gas-filled welded composite enclosures of cast and wrought aluminium alloys
1991BS EN 50069:1991+A1:1993 Specification for welded composite enclosures of cast and wrought aluminium alloys for gas-filled high- voltage switchgear and controlgear