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2.10.5 Solid insulation
/ X4 o2 C( J0 _7 {2.10.5.1 General
1 T/ v% Z! X! W6 @In 2.10.5, the requirements for SOLID INSULATION (except those for thin sheet material) and for! J1 K/ d' L3 q3 E# u6 A% l3 ?0 \
insulating compound also apply to gel materials, used for this purpose.
8 s3 k% M9 T$ K8 ~+ ]SOLID INSULATION shall be:
9 X5 U1 R1 ?0 W5 e− so dimensioned that overvoltages, including transients, that enter the equipment, and- M# t! a% P* }0 _" y
peak voltages that may be generated within the equipment, do not break down the SOLID* h0 ]0 G1 B6 m6 ]' N/ l% ~* s
INSULATION; and9 U# w6 j% ?: M( `& U( R
− so arranged that the likelihood of breakdown occurring due to the presence of pinholes in9 R) k# R) q% H. S4 M
thin layers of insulation is limited.
1 C' L1 h8 x" A7 z* g) KSolvent-based enamel is accepted only on winding wire as described in 2.10.5.13.
( ~% e. J7 K& i3 T& k; t' IExcept for printed boards, SOLID INSULATION shall either
7 z: h D6 G6 l) q5 b2 L− comply with minimum distances through insulation in accordance with 2.10.5.2; or
* V8 W& w% ]5 x/ z: t( w− meet the requirements and pass the tests in 2.10.5.3 to 2.10.5.13, as applicable.1 E% | o- z$ ^* L7 K
NOTE 1 For printed boards, see 2.10.6.) E" E& L( `. P9 g1 b
NOTE 2 For SOLID INSULA TION on internal wiring, see 3.1.4.1 S* c' |) i3 y3 T2 L1 J
Compliance with the requirements of 2.10.5.2 to 2.10.5.14 for the adequacy of SOLID* d% Z- b" e, E( Q
INSULATION is verified by inspection and measurement, taking into account Annex F, by the! g% V( ~; }+ N7 e2 S1 n
electric strength tests of 5.2 and by any additional tests required in 2.10.5.4 to 2.10.5.14.
. B' p# X+ P1 H7 f/ e2.10.5.2 Distances through insulation1 M3 f+ [! e9 |/ r \, A
If a design is based on distances through insulation, these distances shall be dimensioned
' h* e' L" N& X' ^/ ?( H9 u% Zaccording to the application of the insulation (see 2.9) and as follows (see Figure F.14):/ {# @7 X" _! K0 U( c& i6 ~
− if the PEAK WORKING VOLTAGE does not exceed 71 V, there is no requirement for distance
3 u: }9 x1 a& L" M! j% O* Cthrough insulation;3 h) T/ L! S) _* @/ [# ?: U( E% l+ `1 b
− if the PEAK WORKING VOLTAGE exceeds 71 V, the f ollowing rules apply:
4 x2 t; F, O C1 P0 I$ N& X* E4 \" h• for FUNCTIONAL INSULATION and BASIC INSULATION there is no minimum distance through* P! F+ o |- Y x
insulation;+ u4 T$ x7 {# I4 F
• SUPPLEMENTARY INSULATION or REINFORCED INSULATION shall have a distance through S Y1 `2 F9 S3 q5 @
insulation that is 0,4 mm or greater, provided by a single layer.8 P( ~& u: s, L! ` q5 a5 M \6 e
For compliance criteria, see 2.10.5.1. |
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