60335单层内部线绝缘是否一定不可以当加强绝缘？

安工

广东安规检测
有限公司提供：

小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

各种试验指现货

可程式恒温恒湿试验箱

水平垂直燃烧机

自动卷线器试验机

耐划痕试验机

各种灯头量规现货

灼热丝试验机现货

GB1002插头量规

IPX1-X7淋雨现货

IEC61347/UL935镇流器热试验箱

灯具防风罩

IK冲击试验机

UL498插头插座量规

VDE0620插头插座量规

稳定性试验台

家电温升测试角

针焰试验机现货

热电偶焊机现货

家电125mm试验指

E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

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.
9 `+ \/ Q: p! L
+ M1 ]1 O! s  ]: t0 MThe 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.
- ^2 K- |0 Y- k; t8 Y* o" o$ n$ MA 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.
6 H5 @4 q' ^+ O- E3 C. U+ eA single layer of internal wiring insulation does not provide reinforced insulation.
( @* Z6 Q: Q7 ^: ]" G

& ]4 o4 [# j, D# n7 b( t9 ~
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。
& Y) t, ?6 @. m: Z$ C

ylgc123

现在标准的说法是不行ed5.1之后就明文规定了~