60335单层内部线绝缘是否一定不可以当加强绝缘？

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IEC60335试验指甲

根据60335最新版标准条款23.5最后一句， 单层内部线绝缘不提供加强绝缘：
; L9 y9 c- r* r4 ?- y2 l( u23.5 The insulation of internal wiring that is subjected to the supply mains voltage shall withstand the electrical stress likely to occur in normal use.
9 {, n+ Z. U4 Z! D3 x
+ V7 \4 |! t/ ^8 ]3 B# s- m" L) A. gThe basic insulation shall be electrically equivalent to the basic insulation of cords complying with IEC 60227 or IEC 60245 or comply with the following electric strength test.
A voltage of 2 000 V is applied for 15 min between the conductor and metal foil wrapped around the insulation. There shall be no breakdown.
NOTE 1 If the basic insulation of the conductor does not fulfil one of these conditions, the conductor is considered to be bare.
NOTE 2 For class II construction, the requirements for supplementary insulation and reinforced insulation apply except that the sheath of a cord complying with IEC 60227 or IEC 60245 may provide supplementary insulation.
2 S( B( i) `, ~5 V& lA single layer of internal wiring insulation does not provide reinforced insulation.
6 ]* x( l5 R$ _1 h9 U  a; e

5 o' g/ V: V+ H; o5 X
- ?  m2 ~2 U& \1 X% Z$ R7 u, W假如单层内部线绝缘的厚度达到了2mm, 也不可以当加强绝缘吗？表示极度疑惑。
- e9 ^; a4 V) E) Z# ?7 R, l$ i

ylgc123

现在标准的说法是不行ed5.1之后就明文规定了~