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热爱学习 发表于 2015-8-13 17:07 ' p7 d7 _6 ?0 ^' [0 m% e. y( I
固体绝缘29.3的三条是选择性的,只要满足其中一条即可,厚度仅仅是其中一条,并非必须满足
! z1 k: r q0 g; S9 q1 y/ ~而且第三条就 ... $ C: O/ q$ @& d& U, z
22.33 条款2的问题可以归结于对于可接触的导电液体单层绝缘是否可靠的问题,很明显,标准是认为不可靠的,水和金属应该考虑为一体,因为金属是导电没有绝缘的,做绝缘的只是单层的陶瓷体,就算陶瓷体可以做为加强绝缘,也是单层的,也就是说这种结构是绝对不允许的,考虑陶瓷体开裂的问题,还是直接包三层绝缘胶带比较靠谱) e3 v1 {6 O6 n. I7 e! H$ u
' k8 _" p1 m4 K `' n1 J3 G! R/ v$ iFor class II construction, conductive liquids that are or may become accessible in normal5 [/ i( c% U' I5 n# t# E
use and conductive liquids that are in contact with unearthed accessible metal parts shall
4 j, \8 z3 Z% f Onot be in direct contact with basic insulation or reinforced insulation unless the reinforced
# Y9 `, C3 Y0 n! N- W) Linsulation consists of at least 3 layers. |
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