Wrought steel enclosures for gas-filled high-voltage switchgear and controlgear
2 Scope and field of application
2.1 Type of equipment
This Standard applies to fusion welded wrought steel enclosures pressurized
with dry air, inert gases, eg, sulphur hexafluoride, carbon tetrafluoride, 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
(a) 1kV and up to and including 52kV and with gas-filled compartments with
design pressure greater than 3 bar (gauge); and
(b) 72.5 kV and above.
The enclosures comprise parts of electrical equipment not necessarily limited
to the following examples:
Busbars and connections
The scope also covers pressurized components such as the centre chamber of live
tank switchgear, gas-insulated current transformers, etc.
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. The 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
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 user's
inspectors shall not absolve the switchgear manufacturer from this
responsibility to exercise such quality assurance procedures as to ensure that
the requirements and intent of this standard are satisfied.
NOTE. The manufacturer should have a quality assurance program
registered to the applicable ISO 9000 series standards.