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60950-1中:
( m- O$ T7 J$ C9 xPollution degree 1 applies where there is no pollution or only dry, non-conductive pollution. the pollution has no influence.normally ,this is achieved by having components and subasssembilies adequately enclosed by enveloping or hermetic sealing so as to exclude dust and moistrue/ T8 [8 X8 z) E* J! r" I
3 i; r1 d* U) D4 v3 M; B0 hPollution degree 2 applies where there is only non-conductive pollution that might temporatily become conductive due to occasional condensation. it is generally appropriate for equipment covered by the scope of this standard9 g" i( ]9 e N' j; W6 J j
7 Q: k) t& d2 I* C' X! [Pollution degree 3 applies where a local environment within the equipment is subject to conductive pollution, or to dry non-conductive pollution that could become conductive due to expected condensation. |
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