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如果从标准61558 字面意思来看,
% ~0 U3 \# Q! y' y7 R2 X19.17 Transformers having a protection index from IPX1 up to and including IPX6 shall
* R9 m# [: n( I# o4 dhave an effective drain hole at least 5 mm in diameter or 20 mm2 in area, with a width of at$ h# B! I" I* |7 S6 U1 x; v! k
least 3 mm.
$ S4 v" P! [2 O% b: j( DThe drain hole is not required if the transformer, including its windings and core and all) Q5 V6 Z6 ]1 n# J! {
uninsulated live parts, are completely embedded in an appropriate potting material.
b5 R1 B: @0 {
+ U3 Z( E9 `: I' |" h1 _最后一段,线圈、铁心 和所有没绝缘的带电体,都要完整地覆盖 |
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