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| IEVref: | 442-09-09 | | ID: 442-09-09 |
| Language: | en | | Status: Standard |
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| Term: | critical relative humidity
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| Definition: | value of the relative humidity when the impulse withstand voltage of a creepage distance has dropped to 95 % of the value that was measured at 70 % relative humidity
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| Publication date: | 2014-11 |
| Source | IEC 60664-5:2007, 3.2 |
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| Domain1: | Electrical accessories |
| Domain2: | Insulation coordination for low voltage equipment |
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