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Full Description

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 a nd controlgear, where the gas is used principally for its dielectric and/or arc-quenching properties, with rated voltages (a) 1 kV and up to and including 52 kV 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:

Circuit-breakers Switch-disconnectors Disconnectors Earthing switches Current transformers Voltage transformers Surge arresters Busbars and connections

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

2.2

Production The production of the enclosures shall be in accordance with document ed 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 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 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 satisf ied.

NOTE - The manufacturer should have a quality assurance program registered to the applicable ISO 9000 series standards.

Canadian Deviations are included in this Standard.