| Test specimen | ≥20 mm x ≥20 mm x ≥3 mm |
| Test voltage | Between 100 V and 600 V (50 Hz) in 25 V steps |
| IEC Test solution | 395 Ωcm |
| Drop volume | 20 mm³ |
| Failure criteria | Current on breaking ≥0,5 A >2,0 s or material burns |
Results of the test method:
| Insulating material group | CTI |
|---|---|
| I | 600 ≤ CTI |
| II | 400 ≤ CTI < 600 |
| IIIa | 175 ≤ CTI < 400 (FR4) |
| IIIb | 100 ≤ CTI < 175 |
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