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IEVref:426-28-05ID:
Language:enStatus: Standard
Term: maximum surface temperature, <non-electrical equipment>
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Definition: highest temperature that can be attained in service under the most adverse operating conditions (but within the recognized tolerance) by any part or surface of the equipment, protective system or component that can produce an ignition of the surrounding explosive atmosphere

Note 1 to entry: The maximum surface temperature marked on the equipment includes safety margins depending on the EPL of the equipment.

Note 2 to entry: The surface temperature which is relevant can be internal or external depending upon the Type of Protection concerned.

Note 3 to entry: For Ex Equipment in an explosive dust atmosphere, this temperature occurs on the external surface of the enclosure and can include a defined dust layer condition.


Publication date:2020-03
Source:IEC 60079-0:2017, 3.57, modified – In the definition, "any part or surface of Ex Equipment" has been replaced by "any part or surface of the equipment, protective system or component that can produce an ignition of the surrounding explosive atmosphere"; the notes to entry have been added.
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