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：
23.5 The insulation of internal wiring that is subjected to the supply mains voltage shall withstand the electrical stress likely to occur in normal use.

1 g0 s5 m" k6 a" w* qThe 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.
- C1 `4 k" q4 ~9 G/ f; aA 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.
A single layer of internal wiring insulation does not provide reinforced insulation.
  d* N; q1 o9 {7 B7 A8 ?3 B! B0 j
% h' |! D0 u2 A6 K% D) m
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9 @* Q8 m& h2 a9 h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。
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ylgc123

现在标准的说法是不行ed5.1之后就明文规定了~