- minimum and maximum ambient air temperature;
- unusual exposure to vapour;
- explosive gases;
- excessive dust or salt;
- thermal radiation;
- the risk of earth tremors or other vibrations due to causes external to the equipment to be delivered.
In short, any condition deviating from the normal service conditions or affecting the satisfactory operation of the equipment.
The passing of the following tests is obligatory in order to identify switchgear as type-tested:
Dielectric test to verify the insulation level of the switchgear (tests with rated lightning impulse withstand voltage and rated short-duration power frequency withstand voltage with the specified values depending on the respective rated voltage).
Temperature rise tests to verify the current carrying capacity with rated normal currents. Peak and short-time withstand current tests to verify the dynamic and thermal current carrying capacity of the main and earth circuits; the tests are performed with rated peak short-circuit current or rated short-circuit making current or rated shorttime current or rated short-circuit breaking current.
Switching capacity test to verify the making/breaking capacity of the installed switchgear.
Mechanical function test to verify the mechanical functions and interlocks.
Degree of protection tests to verify the protection against electric shock and foreign objects.
Pressure and strength tests to verify the gas tightness and pressure resistance for gas-filled switchgear.
There is also the possibility of voluntarily certifying switchgear for resistance to internal arc faults and for personal protection. Manufacturers and operators can select the criteria which are relevant to them from the following six criteria and have them tested.
Criterion 1: Doors and covers must not open.Covers and doors remain closed. Limited deformations are accepted.
Criterion 2: Parts of the switchgear must not fly off.No fragmentation of the enclosure, no projection of small parts above 60 g weight.
Criterion 3: Holes must not develop in the accessible sides of the Enclosure up to a height of 2 meters.
Criterion 4: Vertical indicators must not ignitedue to the effect of hot gases.
Criterion 5: Horizontal indicators must not ignite due to the effect of hot gases.
Criterion 6: Earth connections must remain effective& connected to its earthing parts.
The IEC 62271-200 defines the following possibilities as in the conditions and nomenclature as specified below:
And regarding accessibility to a compartment:
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