IEC +A+A(E). Edition consolidated with amendments and This English-language version is derived from the. This standard applies to all high-voltage switchgear and controlgear except as otherwise specified in the relevant IEC standards for the particular type of. Find the most up-to-date version of IEC at Engineering
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A device indicating when the spring or weight is charged shall be mounted on the switching device except in the iiec of an independent manual closing operation.
e-cigré > Publication > Guide for application of IEC and IEC Part I and II
At the upper part of the oil. Protective conductor terminal blocks for copper conductors IEC In the particular case of tin-coated parts, due to fretting corrosion effects refer to IEC an increase of the permissible temperatures is not applicable, even under ieec oxygen-free conditions of SF 6.
When the correction oec is outside the range of 0,95 and 1,05, details of dielectric tests shall be subject to agreement between manufacturer and user. High-voltage switchgear and controlgear, and subcommittee 17C: When the distance between the poles of switchgear and controlgear is not inherently fixed by the design, the distance between the poles for the test shall be the minimum value stated by the manufacturer.
This is the general case for non-enclosed switchgear. For an operating device combined with a switching device, it may be sufficient to use only one combined nameplate.
The definitions given below are also applicable. Structure-mounted or floor-mounted enclosures for low-voltage auxiliary and control circuits should be installed at such a height, with respect to the servicing level, that the above requirements for accessibility, operating and reading heights are met. IEC gives three examples of fuse systems as standardized systems with respect to their safety aspects. The switchgear and controlgear shall be considered to have passed the test if no disruptive discharge occurs.
NOTE These values can be used to calculate times between replenishments, Toutside extreme conditions of temperature or frequency of operations. Suitable precautions insulation, service conditions essential for maintain the required minimum low-voltage switches, meters, specifications.
Lec toggle switches shall comply with the requirements of IEC The test voltage shall be raised for each test condition to the test value and maintained for 1 min. For switchgear and controlgear where external insulation in free air is of principal concern, the correction factor K t shall be applied. NOTE 1 The reduction of the test voltage is motivated by the safety margin in the rated test voltage values, which takes ageing, wear eic other normal deterioration into account, and by the statistical nature of the flashover voltage.
Table 7 — Application factors for creepage distances Application to insulation Application factor a Between phase and earth Between phases Across open contacts of a circuitbreaker or a switch 1,0 3 1,0 NOTE 1 Switching devices that may be exposed to out-of-phase conditions may need a somewhat longer creepage distance across the open contacts. For switchgear and controlgear having only internal insulation, the ambient air conditions are of no iwc and the correction factor K t shall not be applied.
The manufacturer shall provide a statement to the testing laboratory of those parts that may be renewed during the tests. Other connectors shall comply with the requirements of the applicable parts of IEC When tests are performed at 60 Hz they should be considered valid for the same current rating eic 50 Hz rated frequency.
If the creepage distances do not comply with the requirements of 5. The rated withstand voltage values for lightning impulse voltage U pswitching impulse voltage U s when 60964and power-frequency voltage U d shall be selected without crossing the horizontal marked lines.
Guide for application of IEC 62271-100 and IEC 60694. Part I and II
The test connections and their ends shall not be a source of radio interference voltage of higher values than those indicated below. If the switchgear and controlgear consist of several poles with independent operating mechanisms, each pole shall be provided with a nameplate. Examples of types of standardized fuses IEC Controlled pressure system for liquid The following test procedure shall be followed: This identification may be limited to the ends of the conductors.
Control contacts [IEV ] which are included in a control circuit of a mechanical switching device may be concerned by this table. The operational iev of the auxiliary contacts should comply with one of the classes shown in table 6694 filament lamps shall comply with the requirements of IEC When tests are performed at 60 Hz, they should be considered valid for the same current rating with 50 Hz rated frequency.
For further information about insulation levels, see annex D.