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| IEVref: | 442-09-08 | | ID: 442-09-08 |
| Language: | en | | Status: Standard |
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| Term: | critical frequency
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| Synonym1: | | | |
| Synonym2: | | | |
| Synonym3: | | | |
| Symbol: | fcrit
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| Definition: | frequency at which the reduction of the breakdown voltage of a clearance occurs
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| Publication date: | 2014-11 |
| Source | IEC 60664-4:2005, 3.4 |
| Replaces: | |
| Internal notes: | 2014-12-10: <in ionospheric propagation> deleted in accordance with mail from VT 60050 convenor. JGO |
| CO remarks: |
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| TC/SC remarks: | |
| VT remarks: | |
| Domain1: | Electrical accessories |
| Domain2: | Insulation coordination for low voltage equipment |
| Domain3: | |
| Domain4: | |
| Domain5: | |