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如果从标准61558 字面意思来看,2 I& u0 ?/ B9 e, i5 @- H( J$ J+ ~
19.17 Transformers having a protection index from IPX1 up to and including IPX6 shall
( v: ]5 w# U5 M; Bhave an effective drain hole at least 5 mm in diameter or 20 mm2 in area, with a width of at6 N a: `# v, P3 r6 m2 R; |+ C
least 3 mm.
3 `: ?9 \4 V' m8 n; JThe drain hole is not required if the transformer, including its windings and core and all
8 I0 @" O8 V+ _uninsulated live parts, are completely embedded in an appropriate potting material. z6 k. a# G# B9 Z( I8 V
) e' W! c' K- {# H/ n* P
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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