|
|
60950-1中:
# x: W+ z& \% l* R+ }6 GPollution 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
: k0 n! k$ Z5 p6 U3 \# v8 ^, c$ v' O9 E1 |: d3 _! T9 j
Pollution 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 standard
: w, O2 f, v( [* l* b" d( v' ?0 ^& L$ q- Z5 U5 ?$ @: z
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. |
|