|
60335-1里面30.2.3中750℃在GWFI和GWIT两个条件下可以不进行测试讨论。; m6 w9 M3 A2 m
/ b$ M$ F( h* r8 J
However, the glow-wire test with a test severity of 750 °C or 650 °C as appropriate, is not% t) A4 Z9 t8 ~; @9 E) a
carried out on parts of material fulfilling both or either of the following classifications:, r3 o/ g" ^" t/ t
– a glow-wire ignition temperature (GWIT) according to IEC 60695-2-13 of at least;
/ T/ C& }! n% H. {• 775 °C, for connections that carry a current exceeding 0,2 A during normal operation,3 \0 {* D3 y1 j$ U9 C, }% R
• 675 °C, for other connections.! U( F, @7 n- u) m/ |
– a glow-wire flammability index (GWFI) according to IEC 60695-2-12 of at least;% R6 f0 t5 k$ v. w4 z: U7 P1 a
• 750 °C, for connections that carry a current exceeding 0,2 A during normal operation,; U. _+ f2 Y' l1 N
• 650 °C, for other connections.
- ?- S \" v/ O) V% `& z5 M* I! k, s: X/ a9 R4 z
9 b. Y5 c' ^/ S% I7 l3 E
5 @0 d; r( a% |! x1 D
GWIT——glow-wire ignition temperature
. K/ B7 T. H9 u+ M# R8 P; \比“连续三次试验均不会引起规定厚度的试验样品起燃的灼热丝顶部最高温度高25K(900℃~960℃之间高30K)”的温度。灼热丝可燃性指数GWFI( e' @3 j$ ^/ x1 E8 ~5 h* q; N
GWFI——glow-wire flammability index8 H. ?& [" U7 H, ~( p
一个规定厚度的试验样品在连续三次试验中的最高试验温度,应满足以下条件之一:
; @# ] b5 v' o8 d% `a) 在移开灼热丝后的30秒内试验样品的火焰或灼热熄灭,并且放置在试验样品下面的包装绢纸没有起燃;
0 ]; }+ b4 L5 B4 |6 ib) 试验样品没有起燃。
9 |/ V7 F( j, z, O) Q讨论:GWFI貌似比GWIT更容易满足?GWFI是三种试验中的最高试验温度?是不是代表我的样品三次试验700、725、750,可以写GWFI 750?- O! }- F5 R& [. m# {
|
|