Clearance Creepage: supplementary
Minimum electrical clearance and creepage distances per IEC 60664-1:2020 (insulation coordination for low-voltage equipment up to 1000V AC / 1500V DC) and IPC-2221B (PCB conductor spacing). Indexed by insulation type (functional, basic, supplementary, reinforced, double, ipc_pcb), pollution degree (1–3), overvoltage category (I–IV), and working voltage (V). Clearance is shortest air-path distance; creepage is shortest surface-path distance. Critical for PCB layout, enclosure design, and product safety compliance (CE, UL, CSA).
| insulation type | record id | altitude correction factor | application note | clearance mm (mm) | creepage mm (mm) | material group | overvoltage category | pollution degree | standard | working voltage V (V) |
|---|---|---|---|---|---|---|---|---|---|---|
| supplementary | supp_pd2_ovc2_150 | 1 | Supplementary insulation; PD2; OVC II; 150V | 0.5 | 0.8 | I | II | 2 | IEC60664-1 | 150 |
| supplementary | supp_pd2_ovc2_250 | 1 | Supplementary insulation; PD2; OVC II; 250V | 1 | 1.25 | I | II | 2 | IEC60664-1 | 250 |
| supplementary | supp_pd2_ovc2_50 | 1 | Supplementary insulation; same distances as basic for same pollution/OVC; combined with basic to form double insulation | 0.2 | 0.6 | I | II | 2 | IEC60664-1 | 50 |
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