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如果从标准61558 字面意思来看,
: c3 T8 k; Z5 |9 \/ e- ?# n7 L19.17 Transformers having a protection index from IPX1 up to and including IPX6 shall
% ~( ^+ s+ L2 d8 ~* b) r& F$ vhave an effective drain hole at least 5 mm in diameter or 20 mm2 in area, with a width of at
. @# @; M$ h% y# J: [ C# n8 nleast 3 mm.
2 f% o7 H3 E9 M7 w/ }The drain hole is not required if the transformer, including its windings and core and all/ f8 S" H) g7 K; Q- U3 p( O
uninsulated live parts, are completely embedded in an appropriate potting material.! I; Q7 N: |2 H9 J' b/ D
8 A( O5 U7 u: r! E- L& {8 y9 I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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