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2.10.5 Solid insulation0 i& p# L. K* {* H5 [( {& m
2.10.5.1 General: V. @$ _: z: `
In 2.10.5, the requirements for SOLID INSULATION (except those for thin sheet material) and for* L+ X& F* I! \( n' B* Y2 d" }
insulating compound also apply to gel materials, used for this purpose.
! R: \: b5 E# d* G* xSOLID INSULATION shall be:
4 C3 J+ p8 o* Z5 a6 d3 ~− so dimensioned that overvoltages, including transients, that enter the equipment, and
& D: N: w% D. S+ h) I v; npeak voltages that may be generated within the equipment, do not break down the SOLID. X. K9 T7 J8 Y2 c3 o1 Y7 b3 [9 y
INSULATION; and. L$ }, N/ j9 r2 G% q! A
− so arranged that the likelihood of breakdown occurring due to the presence of pinholes in
/ x% ~1 F, |5 x: k, l5 J/ O, l% G+ vthin layers of insulation is limited.6 D. L7 d; E3 J% D
Solvent-based enamel is accepted only on winding wire as described in 2.10.5.13.8 L6 @% T1 f, g3 A
Except for printed boards, SOLID INSULATION shall either
0 ~4 U* r7 Z' r e+ M7 `7 F; ?$ H− comply with minimum distances through insulation in accordance with 2.10.5.2; or
( o! Q. G. T! j6 c− meet the requirements and pass the tests in 2.10.5.3 to 2.10.5.13, as applicable.
% G) W+ l: D5 H. M5 t0 S8 nNOTE 1 For printed boards, see 2.10.6.
$ c. v- j" O0 xNOTE 2 For SOLID INSULA TION on internal wiring, see 3.1.4.' |& U) E; Q+ O( A! z3 h
Compliance with the requirements of 2.10.5.2 to 2.10.5.14 for the adequacy of SOLID H1 I, e: I% g# _: Z% ~ w
INSULATION is verified by inspection and measurement, taking into account Annex F, by the! a% F! H" b" g5 t h, p" z6 ~
electric strength tests of 5.2 and by any additional tests required in 2.10.5.4 to 2.10.5.14., K) C' I D6 a% D
2.10.5.2 Distances through insulation
- F7 \% ?3 D6 H6 C& I# G. Y7 HIf a design is based on distances through insulation, these distances shall be dimensioned8 I \; S: \' l; X" [
according to the application of the insulation (see 2.9) and as follows (see Figure F.14):
# z: |% a6 v% M+ S$ l/ r0 C− if the PEAK WORKING VOLTAGE does not exceed 71 V, there is no requirement for distance
: ~0 J6 R3 b: h% t1 i" wthrough insulation;1 w5 P( t5 z* ~& d
− if the PEAK WORKING VOLTAGE exceeds 71 V, the f ollowing rules apply: |/ v8 x( T& {( N/ x4 @( R
• for FUNCTIONAL INSULATION and BASIC INSULATION there is no minimum distance through! t/ O. |& Q1 k$ B9 ]9 m$ h
insulation;
x" S8 s" L+ o9 k# R• SUPPLEMENTARY INSULATION or REINFORCED INSULATION shall have a distance through) N8 ~; m: i; O' t
insulation that is 0,4 mm or greater, provided by a single layer.
+ T, d9 p; ?7 ?: uFor compliance criteria, see 2.10.5.1. |
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