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|  DSH 638
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], p) ?- t/ s | Resistance to heat and fire8 o! c" J4 g" G
| 30.2.3.1
/ Z# S# z" |. T' C | 60335-1(ed.4)
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" z6 ^' O+ Q9 W: KQuestion:1 F) {2 L3 {9 J0 L; Y8 d7 b$ h% c
Sub-clause 30.2.3.1 reads: "parts of insulating material supporting connections that carry a current exceeding 0,2 A during normal operation, and parts of insulating material within a distance of 3 mm of such connections, shall have a glow-wire flammability index of at least 850ºC according to IEC 60695-2-12, the test sample being no thicker than the relevant part"
/ v- z. Z1 b6 t. K8 q+ @! bCertain motors, have a nominal current around 0,2 A (for example, the pump of a washing machine), but during a certain time (for instance, because changes in the load, or the in-rush current) the current exceeds the limit of 0,2 A.
4 N+ a& ? H- \9 U. \! f7 M% ?Shall the current in these periods of the motor be ignored, independently of its duration, in order to compare with the 0,2 A limit?
N( |' R4 T) \3 u( b* {Decision:
, O/ E' l. e( b% Q) v$ h+ ?The current to be considered will be the average current in the relevant operating period.: w8 J$ n) ]" a. t* P' z! h( k
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发表于 2012-9-8 15:38
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