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楼主 |
发表于 2009-9-8 20:28
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怎么理解下面的意思(UL498-2001比较老了)
9 L! ?, L* I `5 l(8 Insulating Materials)
, w( k4 ~, n! |" `5 `6 n8.3 Electrical properties(条款里也有对绝缘材料厚度的要求)
7 s7 G' [8 f2 }$ h1 X8.4 Thermal properties
6 R9 |: G/ T& P, a8 M X+ I* D8.4.1 A polymeric material used for electrical insulation or enclosure of live parts shall have the relative
. p! }; O" a/ Pthermal index ratings shown in Table 8.2 for the specific application of the insulating material. For) m. x2 ~# B' n; J4 ^1 `
materials with other than VTM flammability classifications, the material shall be evaluated using the
& R% |0 x4 F! P3 w/ k4 Wspecimen thickness employed in the end product or nominal 1/8 inch (3.2 mm) thickness, whichever is0 `9 G- E1 h5 z2 D
greater.4 D) W0 y! Y$ i" G5 ?+ r1 M5 v* y
以上条款的绝缘材料的厚度要求是否对插头外围尺寸起限制作用.或者只是对材料测试时的一种要求. |
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