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热爱学习 发表于 2015-8-13 17:07
/ v# _- k9 H k8 c; O; S6 z/ t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
& r3 g! y. b6 J( j4 t. S1 R! m7 Z7 v而且第三条就 ...
1 ?5 K0 X( ?$ f, ^4 \( G1 c8 N22.33 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
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0 n4 B/ {1 @/ VFor class II construction, conductive liquids that are or may become accessible in normal% a$ r$ y% J0 _' O' {0 i3 W) H* Q% Q
use and conductive liquids that are in contact with unearthed accessible metal parts shall1 l, @7 b# S9 Z% j% N3 @
not be in direct contact with basic insulation or reinforced insulation unless the reinforced! e. _9 t2 ^9 U% S- E c
insulation consists of at least 3 layers. |
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