Stafford Aero Technologies - CE marking - EMC and LVD testing specialists for UK imports Telephone: +44 (0)1603 760 629
Email: mail@staffordaerotechnologies.co.uk
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Clearance & creepage distances
Clearance = Shortest distance in air (air insulation)
Creepage = shortest distance along the surface of the insulating material (material insulation)

Pollution degree

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
(see
note 1)

Values for minimum creepage distances

Pollution degree 1

Pollution degree 2

Pollution degree 3

PCB

Other material

PCB

Other
Material

Other material

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:
Pollution degree 2: 0.2mm
Pollution degree 3: 0.8mm

Note2.  Values are for Basic insulation.  For Reinforced insulation, they are twice the value.

 

FULL TABLE


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UK specialists in emc & lvd testing and ce marking. Experts in aeronautical system design for over 25 years.