Heavy-duty Connector Devices Of Overvoltage Category
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111 Equipment belonging to overvoltage category Ill:
222 Equipment belonging to overvoltage category Ill is 333 equipment installed in the power distribution device, and 444 equipment whose use safety {working reliability} and 555 applicability must meet special requirements.
Note: This type of 666 equipment includes switching devices installed in the power distribution device and industrial 777 equipment permanently connected to the power distribution device.
