3. Main test methods
It is not possible, within the scope of this article, to examine all test procedures, even for the products listed in table 1 . We shall therefore limit ourselves to indications for the most common tests.
3.1 Voltage tests
3.1.1 Standards and test conditions
Power-frequency, surge and direct-current voltage tests are defined in standards :
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Main test methods
Testing laboratories. Award of the NF mark
