Metal Enclosed Switchgear Sample Clauses

Metal Enclosed Switchgear. The requirements of this section are intended to cover complete switchgear assemblies. Component parts such as circuit-breakers, current and voltage transformers and instruments, shall have already been submitted to separate tests as specified in the relevant IEC Recommendations. General Checks A general check of all the main switchgear and ancillary equipment shall be made and shall include a check of the completeness, correctness and condition of earth connections, labelling, arcing ring and horn gaps, painted surfaces, cables, wiring, pipework, valves, blanking plates and all other auxiliary and ancillary items. Checks shall be made for gas leaks and that insulators are clean and free from external damage. A check shall be made that loose items which are to be handed over to the Employer, e.g. blanking plates, tools, spares, are in order and are correctly stored or handed over. Routine Tests In accordance with the requirements of IEC 62271. The inter- changeability feature of identical units, together with the interlocking provided for preventing units of different ratings being interchanged shall be demonstrated. Supply voltage variations for auxiliary devices shall be in accordance with the requirements of this Specification. Fluid leakage tests shall be included for gas filled switchgear. Type Tests In accordance with the requirements of IEC 62271. A weather proofing test will not be required for completely indoor mounted equipment. 5.2.1 Circuit-Breakers a) Routine Tests In accordance with the requirements of IEC 62271, together with any tests carried out as a normal routine procedure by the Manufacturer. Contact resistance tests shall be carried out with not less than 15 amperes passing through the contacts. In the case of multi-interrupter circuit-breakers, resistance tests will be required at each interrupter or pair of interrupters as well as through the series of interrupters on each pole. Operational tests will include local and remote trip/close. In the case of gas type circuit-breakers, testing will be required on the gas system to prove the gas quantity, its dryness and its dielectric strength. The gas leakage shall also be measured.
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