To make sure that we continue to meet your needs, your feedback is essential. The committee has decided that the contents of this publication will remain unchanged until A suitable fume extraction system shall be provided to allow safe venting of the enclosure after the test.
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NOTE 1 It may be impossible to determine the CTI of some materials because a valid failure cannot be achieved, the characteristic behaviour moving directly from withstanding the test period at one voltage to exhibiting air arcs at the next highest test voltage. Please help to improve this article by introducing more precise citations.
In terms of clearance, a higher CTI value means a lower minimum creepage distance required, and the closer two conductive parts can be. Major changes since the previous edition are the following: Test results cannot be used directly for the evaluation of safe creepage distances when designing electrical apparatus.
Where the direction of the electrodes relative to any feature of the material is significant, measurements shall be made in the direction of the feature and orthogonal to it. The surface between the electrodes is subjected to a succession of drops of electrolyte either until the over-current device operates, or until a persistent flame occurs, or until the test period has elapsed.
If none of the above occurred and at least 25 s elapsed after the fiftieth drop had fallen without the over-current device operating, the test was valid and the test specimen is considered to have passed.
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NOTE 1 The proof tracking index is used as an acceptance criterion as well as a means for the quality control of materials and fabricated parts. Small plates ISO The object of the IEC is to promote international co-operation on all questions concerning standardization in the electrical and jec fields. The thickness of the test specimen shall be 3 mm or more. August - Bottisham Medical Practice.
Preview Abstract IEC Vertebrate Paleontology Term Project Learning. Ensure freedom from visual contamination and ensure that the solution to be used conforms to the conductivity requirements either by regular testing, or by measurement immediately before the test. Reference number IEC The individual tests are of short duration less than 1 h with up to 50 or drops of about 20 mg of electrolyte falling at 30 s intervals between platinum electrodes, 4 mm apart on the test specimen surface.
If this is impossible, the results shall be reported together with a statement describing the surface of the specimen because certain characteristics on the surface of the specimen could add to the dispersion of the results.
INTERNATIONAL STANDARD IEC
Operation of the over-current device by air arcs does not constitute a tracking failure. Any divergence between the IEC Standard and the corresponding national or regional standard shall be clearly indicated in the latter.
If the over-current device operated due to the occurrence of an air arc above the test specimen, the test was invalid. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation.
Consolidated editions The IEC is now publishing consolidated versions of its publications.
For example, edition numbers 1. Flushing through some 10 to 20 drops depending upon the delay between tests will normally remove any non-conforming liquid.
NOTE 2 It is preferable to use separate test specimens for each test. If the over-current device operated due to the passage of an excessive current across the surface of the test specimen, or if a persistent flame occurred, the specimen failed the test at that voltage.
There's no CTI requirement for glass, ceramic, and other inorganic material which don't breakdown on surface. Where a hole developed through the specimen, its formation shall be reported together with an indication of its depth specimen or stack thickness. NOTE 3 With most, but not all designs of apparatus, if the electrodes move during a test due to softening or erosion of the specimen, their tips will prescribe an arc and the electrode gap will change.
Comparative Tracking Index
Languages Deutsch Italiano Suomi Edit links. Differences in design could give rise to differences in inter-apparatus results. Pass or fail at the specified voltage with an indication of the type of solution if Type B, and 6012 maximum depth of erosion. Pass or fail at the specified voltage with an indication of the type of solution if Type B. To make sure that we continue to meet your needs, your feedback is essential. The sharp edge shall 6011 removed to produce an approximately flat surface, 0,01 mm to 0,1 mm wide.