I. Determination and Testing Methods for External Conductive Parts Attached to the Appliance
External conductive parts that are attached to or form part of a non-metallic enclosure and have a ground resistance exceeding 1 GΩ when measured at (500 ± 25) V d.c., and parts that are susceptible to static charges that may become ignition sources, such as nameplates, etc.
The capacitance of such components shall be determined in accordance with the test methods specified in the relevant clauses.
II. Requirements for Other Devices Except Portable or Individual Devices
If the measured capacitance of any conductive part exceeds the values shown in Table 11, the equipment shall be marked with the appropriate symbol “X” and the special conditions of use shall specify the measured capacitance value so that the user can determine the applicability in specific applications. External conductive parts located in such a position that they are not expected to discharge to approaching grounded objects need not be tested.
Note: ① It is generally believed that the capacitance of ungrounded metal fasteners such as cover screws will not exceed 3 pF. ② For Class III equipment intended for use in pipes where rapidly moving dust may occur, a lower capacitance limit is under consideration.
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