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|  DSH 638
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6 o3 d! }) }/ ?. i9 `& @5 w | Resistance to heat and fire
/ E( J1 M* M. d& ]" }! i | 30.2.3.1
) i8 Y6 N' X/ Z4 ^7 O- ~ | 60335-1(ed.4)$ C7 U" m- Z" {+ ^" b4 Z4 S
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Question:% O* b1 ^+ k9 F4 A4 p8 U
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"
/ B0 U* J' u: E. oCertain 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.
* ~- b, w' M: z2 ?7 s1 l9 f- D" gShall the current in these periods of the motor be ignored, independently of its duration, in order to compare with the 0,2 A limit?
9 q: {# M. f8 C+ W, V/ |: j8 U& hDecision:
9 _1 }: j x( zThe current to be considered will be the average current in the relevant operating period.# Q: x- G6 ]; K: q( s7 d
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发表于 2012-9-8 15:38
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