& u! b0 k3 m1 C5 X) r
已解决,见温升表的注3。作者: 520168 时间: 2013-4-10 12:00
是那个标准?我看UL的产品是按导热率来算的,作者: 520168 时间: 2013-4-10 12:44
UL1310表31.1 (c) 材料的导热系数大于2.419Btu/h/ft2/ft/℉ (0.01c/s/cm2/cm/℃)可被考虑为金属。. Y0 q6 o" a5 G Q% \% a
IEC标准产品塑料外壳有电镀层是不是也按金属来算限制温度。作者: Dan_Tan 时间: 2013-4-10 18:29
见CLause 11.8 of IEC 60335-1 A2006 note 作者: plmijb 时间: 2013-4-12 08:51
EN 60335-1 表3中 ZB,ZC,ZD 中有要求。1 l$ S$ h2 V' h2 E% W4 |: T; R
zb When the thickness of plastic coating does not exceed 0,3 mm, the temperature rise limits of coated metal or glass and ceramic apply. $ j3 v1 A& d: [" J6 q4 G Z8 C0 mzc Metal is considered coated when a coating having a minimum thickness of 80 μm made by enamel or non substantially plastic coating is used. : Y2 s) |* Z# q8 L" Z! Izd The temperature rise limit applies also for plastic material having a metal finish of thickness less than 0,1 mm.9 W: i7 D0 B4 o. W% S8 E- j
z0 m) S3 f: R9 F4 a
of bare metal 50; X1 @, T+ Z& I) g+ J
– of coated metal zc 60 7 q" N) q) O- L* b; ^6 d– of glass and ceramic 65 ( H% N5 H* ` w4 C& K9 ]4 F– of plastic having a thickness exceeding 0,3 mm zd 75 8 l) @5 S- O, I: X6 E- r作者: mikk 时间: 2013-4-12 12:43
可是,学习啦~作者: shinylee 时间: 2013-4-12 14:06
按模制材料作者: gazerx 时间: 2013-4-12 16:33
看标准看得头晕作者: 水中月 时间: 2013-4-13 08:39
有谁能给详细的解释下!拜托!作者: Jason020 时间: 2013-4-13 13:05