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如果从标准61558 字面意思来看,! p" W4 p# j! d" \& |9 v
19.17 Transformers having a protection index from IPX1 up to and including IPX6 shall
/ B6 R- R' @: C" q; T* Khave an effective drain hole at least 5 mm in diameter or 20 mm2 in area, with a width of at, C' o% H' v$ i2 _
least 3 mm.! O7 K7 ]8 u }7 u% @" ~ ^
The drain hole is not required if the transformer, including its windings and core and all$ R% Q8 s) N; f, Z8 a7 P
uninsulated live parts, are completely embedded in an appropriate potting material.+ E& l( @, j% I) c/ ~' l( d1 b) B
$ S) q4 s. |9 F6 c% l" _( j/ ?
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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