Clearance & Creepage Calculator
Design-condition checklist
Review clearance and creepage design conditions with a safety engineer. Numeric distances are temporarily unavailable.
What this page can and cannot tell you
Clearance and creepage distances depend on the product standard and eight design conditions: working voltage and waveform; impulse voltage and transient conditions; pollution degree and environment; overvoltage category; insulation type; material group and verified cti from the laminate supplier (do not infer from fr-4); operating altitude; applicable product standard. This page does not compute a numeric result for this topic.
Assumptions
- Distances must come from the applicable standard text and your safety engineer.
Limits
- The earlier numeric model lacked verified IEC source text and a complete condition model, so it is switched off.
Clearance & Creepage — design-condition checklist (numeric calculator temporarily unavailable)
Numeric clearance and creepage results are temporarily unavailable. The previous model lacked verified IEC source text and a complete design-condition model, so it has been switched off pending review.
Prepare these design conditions for review by a qualified safety engineer:
- Working voltage and waveform
- Impulse voltage and transient conditions
- Pollution degree and environment
- Overvoltage category
- Insulation type
- Material group and verified CTI from the laminate supplier (do not infer from FR-4)
- Operating altitude
- Applicable product standard
Important Safety Notice
Consult the full applicable safety and product standards and have the design reviewed by a qualified safety engineer. This checklist does not determine required distances or establish compliance.
Related Safety Tools
Review current capacity separately from insulation and safety requirements.
Clearance & Creepage FAQ
Why are numeric distances unavailable?
Numeric clearance and creepage results are temporarily unavailable. The previous model lacked verified IEC source text and a complete design-condition model, so it has been switched off pending review.
Can FR-4 be assigned one material group?
No. Obtain the actual laminate CTI and material classification from the supplier and review it against the applicable standard.
Who should determine the required distances?
A qualified safety engineer should assess all design conditions against the applicable standards.
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