Table 10DV – Minimum creepage distances and clearances (in millimetres)
Between live parts and other metal parts
over reinforced insulation:
– if the live parts are lacquered or
enamelled windings
–
–
5,0
5,0
6,0
6,0
–
–
– for other live parts
–
–
8,0
5,0
8,0
8,0
–
–
The force is applied by means of the test finger of Figure 1, and has a value of:
– 2 N for bare conductors and for uninsulated capillary tubes of thermostats and similar
devices;
– 30 N for enclosures.
The way in which creepage distances and clearances are measured is indicated in Annex A.
If a barrier is interposed, clearances are measured over the barrier or, if the barrier is in two parts with
mating surfaces which are not cemented together, through the joint.
For tools having parts with double insulation where there is no metal between basic insulation and
supplementary insulation, the measurements are made as though a metal foil were present between the
two insulations.
When assessing creepage distances and clearances, the effect of insulating lining of metal enclosures or
covers is taken into consideration.
Means provided for fixing the tool to a support are considered to be accessible.
For conductive patterns on printed circuit boards, except at their edges, the values in the table between
parts of different potential may be reduced, as long as the peak value of the voltage stress does not
exceed:
– 150 V per mm with a minimum distance of 0,2 mm, if protected against the deposition of dirt;
– 100 V per mm with a minimum distance of 0,5 mm, if not protected against the deposition of
dirt.
When the limits mentioned above lead to higher values than those of the table, the values of the table
apply.
For peak voltages exceeding 50 V, the reduced creepage distances only apply if the Proof Tracking Index
(PTI) of the printed circuit board, measured as in Annex G, is greater than 175.
These distances may be reduced further, provided that the tool complies with the requirements of clause
18 when the distances are short-circuited in turn.
Creepage distances and clearances within optocouplers are not measured if the individual insulations are
adequately sealed, and if air is excluded between individual layers of the material.
For live parts of different polarity separated by basic insulation only, creepage distances and clearances
smaller than those specified in the table are allowed, provided the requirements of clause 18 are met if
these creepage distances and clearances are short-circuited in turn.
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