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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)2 Y( b3 E y4 `7 N# P& A7 p% ]* S
(8 Insulating Materials)
! a p. |$ B' Y* p8.3 Electrical properties(条款里也有对绝缘材料厚度的要求)
Q- g7 A+ e, `8.4 Thermal properties
( j) H! `4 e! B6 r8 b8.4.1 A polymeric material used for electrical insulation or enclosure of live parts shall have the relative
' [+ m9 k8 m) P G0 u4 Nthermal index ratings shown in Table 8.2 for the specific application of the insulating material. For, A! r4 w4 L3 p3 h/ O
materials with other than VTM flammability classifications, the material shall be evaluated using the7 r% [) f3 j: }1 a
specimen thickness employed in the end product or nominal 1/8 inch (3.2 mm) thickness, whichever is
% h6 A$ Q+ Z" T% l" ugreater.: F6 p4 ]9 S2 ?8 C
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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