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29.3 Supplementary insulation and reinforced insulation shall have adequate thickness,' D, a8 h* B2 X4 {" o. Z
or have a sufficient number of layers, to withstand the electrical stresses that can be expected t2 ]/ [" x; w* C8 U; A5 U$ W
during the use of the appliance.
8 t5 G1 ]8 y% WCompliance is checked X+ ^7 K% {. y n5 H& w5 k0 M
– by measurement, in accordance with 29.3.1, or
. d& G/ h5 \& u- b X- r; t– by an electric strength test in accordance with 29.3.2, if the insulation consists of more
' [9 l/ n2 J/ U; Lthan one separate layer, other than natural mica or similar flaky material, or
% O# y# n; i3 n) Y" G& k– by an assessment of the thermal quality of the material combined with an electric strength
+ \6 m. f$ ]0 ^test, in accordance with 29.3.3 and for accessible parts of reinforced insulation( _. }- V+ r! O3 S/ x5 s: z# U6 |
consisting of a single layer, by measurement in accordance with 29.3.4, or |
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