25
2 1
3 1. width
X [mm]
1 0.
For the design clearances and
creepage distances, application
of the regulations for insulation
coordination produces the following
interrelationships:
Clearances
Clearances are rated accordance
with the following factors:
• Anticipated overvoltage
rated impulse withstand voltage
• Used overvoltage protection
precaution
• Measures prevent pollution
pollution severity
Creepage distances
Creepage distances are rated in
accordance with the following factors:
• Planned rated voltage
• Insulation materials used
insulation group
• Measures prevent pollution
pollution severity
Slots are taken into account when
measuring creepage distances their
minimum width dimensioned
according the following table:
Pollution severity min.16 1282250000 2012/2013
.5
If the associated clearance air is
less than mm, the minimum slot
width can reduced 1/3 the
clearance.Electrical data
Since April 1997 the sizing of
clearances and creepage distances
has been covered IEC 60664-1
“Insulation coordination for electrical
equipment low-voltage systems”.
The design data resulting from these
provisions applicable specified
in this catalogue for each product.
Design the clearances and creepage distances
in electrical equipment general
W
Technicalappendix
W.5
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