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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). N9 r' A8 ^6 r" a
(8 Insulating Materials)
1 w7 n0 A! _. x( q8.3 Electrical properties(条款里也有对绝缘材料厚度的要求)
' M }: h' f! v/ a8.4 Thermal properties
9 F( g- r9 }' C" ^6 p8.4.1 A polymeric material used for electrical insulation or enclosure of live parts shall have the relative4 C' I: w! f6 q0 w7 g8 }2 U
thermal index ratings shown in Table 8.2 for the specific application of the insulating material. For8 n( q% v8 Q/ j! P
materials with other than VTM flammability classifications, the material shall be evaluated using the
" Z' n8 @, d# J& v9 @& bspecimen thickness employed in the end product or nominal 1/8 inch (3.2 mm) thickness, whichever is8 h1 l& h! [0 F' D6 T o
greater.2 w) p% y7 G) O& x
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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