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29.3 Supplementary insulation and reinforced insulation shall have adequate thickness,
0 [6 j* j5 N4 b2 w; z0 }or have a sufficient number of layers, to withstand the electrical stresses that can be expected! e. D4 c8 o! i! h( z
during the use of the appliance.* L+ H/ i- }" \. l6 ~4 N
Compliance is checked
3 N2 l& F; r8 F. e) A+ Z* O9 u$ O– by measurement, in accordance with 29.3.1, or' C, O. E+ d, X5 ^
– by an electric strength test in accordance with 29.3.2, if the insulation consists of more; N3 z8 \# v# }* k0 K2 e) P
than one separate layer, other than natural mica or similar flaky material, or
% p% f: u& j3 T3 P– by an assessment of the thermal quality of the material combined with an electric strength& V8 w; T; s) K) j! l
test, in accordance with 29.3.3 and for accessible parts of reinforced insulation
" l/ F8 J4 ] E" }1 @$ ?! i; Rconsisting of a single layer, by measurement in accordance with 29.3.4, or |
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