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IEVref:426-11-25ID:
Language:enStatus: Standard
Term: maximum RMS AC or DC voltage
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Symbol: Um
Definition: maximum voltage that can be applied to the connection facilities of associated apparatus without invalidating intrinsic safety

Note 1 to entry: This additionally applies to the maximum voltage that can be applied to connection facilities of intrinsically safe apparatus when located in a non-hazardous area (for example, charging connections on battery operated apparatus, where charging is only done in the non-hazardous area).

Note 2 to entry: The value of Um can be different at different sets of connection facilities, and can be different for AC and DC voltages.


Publication date:2020-03
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