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29.3 Supplementary insulation and reinforced insulation shall have adequate thickness,
$ ]5 z- f) Y& V& M' ?+ Bor have a sufficient number of layers, to withstand the electrical stresses that can be expected8 w, y, O# l8 i7 m: W- v Q5 v1 l
during the use of the appliance.- f, ~* ?2 ^, @% a: z
Compliance is checked
. R: U! S9 f z1 v* i6 ]% A* }– by measurement, in accordance with 29.3.1, or" s: [. ?, c) Q( G
– by an electric strength test in accordance with 29.3.2, if the insulation consists of more* `. c5 v- }/ o
than one separate layer, other than natural mica or similar flaky material, or
: e4 _, n: G) c U* E– by an assessment of the thermal quality of the material combined with an electric strength
2 |6 p3 O9 D4 T# e3 Q3 `test, in accordance with 29.3.3 and for accessible parts of reinforced insulation5 P8 c/ t; ]- G; g. ~ h: p
consisting of a single layer, by measurement in accordance with 29.3.4, or |
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