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Email: emc@staffordaerotechnologies.co.uk 4 Chalk Hill House, 19 Rosary Road, Norwich, Norfolk, NR1 1SZ, UK |
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Home > Glossary of Terms |
Clearance & creepage distances
Clearance = Shortest distance in air (air insulation)
Creepage = shortest distance along the surface of the insulating material (material insulation)
Pollution degree |
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1 |
Nonconductive dry pollution |
2 |
Temporary condensation |
3 |
Expected condensation |
For simplicity the table shows the worst case material.
Voltage line to neutral a.c. r.m.s. or d.c. |
Values for clearance |
Values for minimum creepage distances |
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Pollution degree 1 |
Pollution degree 2 |
Pollution degree 3 |
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PCB |
Other material |
PCB |
Other |
Other material |
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V |
mm |
mm |
mm |
mm |
mm |
mm |
50-100 |
0.1 |
0.1 |
0.25 |
0.16 |
1.4 |
2.2 |
100-150 |
0.5 |
0.5 |
0.5 |
0.5 |
1.6 |
2.5 |
150-300 |
1.5 |
1.5 |
1.5 |
1.5 |
3.0 |
4.7 |
300-600 |
3.0 |
3.0 |
3.0 |
3.0 |
6.0 |
9.4 |
Note 1. Minimum values for clearance at different pollution degrees are: Note2. Values are for Basic insulation. For Reinforced insulation, they are twice the value. |
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UK specialists in emc & lvd testing and ce marking. Experts in aeronautical system design for over 25 years. |
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