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|  DSH 638' c: I& h6 {0 `4 K
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| Resistance to heat and fire* J7 w; E# a p" h3 \
| 30.2.3.1
# G7 E! E s3 P( Q$ @) a | 60335-1(ed.4)) q5 K" |; |2 r) A* K/ D
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Question:( E( P) W& V8 p8 ?! b
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"5 \* A# c4 a) ]5 M @3 U
Certain 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.
8 L, ^1 _. F, MShall the current in these periods of the motor be ignored, independently of its duration, in order to compare with the 0,2 A limit?
7 f. p b9 Y: D" t4 QDecision:
. X$ R/ c+ u) h; gThe current to be considered will be the average current in the relevant operating period.; r) [# M2 |4 F0 V9 y0 O, s2 z- `
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发表于 2012-9-8 15:38
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