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给出结论要有理有据。下面是引用UL标准中的一段话：
7 B1 ^% I. x4 _' c# M* }electrical (prevention of dielectric breakdown and7 C* z- g5 Z& k$ X/ ~8 o
excessive leakage current), mechanical without impact (functional support of electrical conductors and# [! M \( x% N4 `$ S8 [
supporting members), mechanical with impact (for prevention of accessibility to live parts and for
( d/ t( w" D4 j$ P; u( f) o( r% \+ lcontinued maintenance of electrical spacings)
6 Y1 `9 E) k+ W" a8 |4 X+ z下面的是引用UL网站的：+ X( o( @6 ^) {8 G A4 p
Relative temperature index (RTI)
7 Z& B( [0 `) a7 E9 z
5 Z9 M& d( E$ J, z# UMaximum service temperature for a material where a class of critical property will not be unacceptably compromised through chemical thermal degradation. This spans over the reasonable life of an electrical product, relative to a reference material having a confirmed, acceptable corresponding performance defined RTI.3 p1 f2 T# _- S' j C2 f
RTI electrical( w T! _$ _. r! A
+ ]& G& C, n W( e; ZThe electrical RTI is associated with critical electrical insulating properties.8 k. {# q) p% v4 y
RTI mechanical impact
7 S0 ~% u+ H5 i" g
5 A, _- O; C# z8 l" u* lThe mechanical impact RTI is associated with critical impact resistance, resilience and flexibility properties.! D, g6 ]- |7 \% o2 L
RTI mechanical strength
) q9 g1 x& q, Z2 }7 u
' r" t6 p9 h6 v9 F& A; G8 Y; R# fThe mechanical strength (mechanical without impact) RTI is associated with critical mechanical strength where impact resistance, resilience and flexibility are not essential. |
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发表于 2010-10-20 17:31
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