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：
1 D% L( s0 N3 `, `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.
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The 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.
  y" K1 E! x9 f$ X4 d, D4 TA 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.
9 d- {; C; Y/ f6 \: zA single layer of internal wiring insulation does not provide reinforced insulation.

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3 L: F2 x6 \& [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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