关于UL线缆测试的讨论贴!

李云峰

广东安规检测
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引用第47楼dzxtt于2007-08-12 13:24发表的  :
热延伸是否是线材老化后的伸长率呢？标准里有规定的啊

热延伸是针对材料的测试,不是老化后的伸长率,他是要求在一定的温度下对试样施加一定的机械负荷,等到规定的时间以后测量负荷下的伸长和撤去负荷的伸长,与原试样的长度之比!

xiaoxiangtongzi

有的也叫加热变形试验-----实际与楼上李兄说的是一样的;
例如--UL62规定:
: T3 ^8 @0 ^* w) VNMX-J-191
% p- i- D) a; K7 |9 rHeat Deformation of Semiconductive Shielding, Insulations and Protective Coverings of Electrical
  I! Q& ^( q3 w1 CConductors – Test Method

5.1.3 Deformation
5.1.3.1 Insulation
The insulation on single-conductor wires, and on the individual conductors (separated, in the case of
2 N% _4 U& @, i8 [  U( c9 dparallel cords), shall not decrease by more than 50% in thickness when subjected to a force caused by a
mass as shown in Table 40, and while maintained at the temperature shown in Table 40 for 1 h.
, Z; r. d- t2 f6 H0 Y5.1.3.2 Jacket
Smoothed specimens of jackets from finished cords and cables shall not decrease by more than 50% in
& C6 p% _' w$ L& R. Y( B- n8 A7 [thickness when subjected to a force caused by a mass of 2000 g, and while maintained at the temperature
shown in Table 40 for 1 h.
5.1.3.3 Method
Compliance with Clauses 5.1.3.1 and 5.1.3.2 shall be determined in accordance with the method
, g! D. H' R8 Y) U6 k) Q2 t" vdescribed in CSA C22.2 No. 0.3, Clause 4.3.6.1; UL 1581, Section 560; or NMX-J-191-ANCE.

wangrang

有沒有誰比較了解HPN線材的耐電弧測試的呢?說說吧!

xiaoxiangtongzi

引用第53楼wangrang于2007-08-29 13:28发表的  :
有沒有誰比較了解HPN線材的耐電弧測試的呢?說說吧!

参照UL62 第 5.2.5~5.2.6条.UL62-2006版第49页.~呵呵~
8 S1 p: h/ ^# G" n  M6 D$ z5.2.5 Standard arcing test for Type HPN
5.2.5.1 General
4 q: N: v- H8 S9 b3 Q, GType HPN cord shall not arc when a specimen of finished cord is connected at one end to a 120 V (rms)
source of supply through a 15 A fuse or circuit breaker and subjected to a standard test flame applied 13
. E' t5 [# \0 ?0 _2 M0 m) q: hmm (0.5 in) from the other end of the specimen for 2 min. Compliance shall be determined in accordance
with the method described in Clause 5.2.5.2; CSA C22.2 No. 0.3, Clause 4.28.12; or UL 1581, Section 1670.
5.2.5.2 Test method
# `* u; M' ~2 K4 wThe specimen for test shall be of any suitable length. One end shall be cut off square, care being taken
% t# S8 X: ^# _( @5 sthat the conductor ends are flush with the cut end of the cord. The cord shall be laid across a
  v- T0 Y4 x6 T) Pnonconductive surface, the square cut end protruding approximately 0.1 m (4.0 in) beyond the surface
edge. The opposite end shall be connected to the voltage source between the conductors of a
5 Y6 K8 s. F- Otwo-conductor cord and between the circuit conductors joined together and the grounding conductor of a
three-conductor cord. Using a Tirrill, Bunsen, or similar appropriate gas burner, a standard test flame (as
described in Clause 5.1.5.1) shall be obtained. With its barrel vertical, the burner shall be placed under
5 K, x1 x( E1 K7 U7 v4 \. Z. Hthe free end of the cord with the tip of the inner blue cone touching the flat underside of the specimen
3 _& Q6 \4 w+ S, |( g. emidway between the conductors and 13 mm (0.5 in) from the square end for a 2 min period. The cord
& m& i' t3 h, f8 s3 `0 jdoes not comply if arcing occurs between the conductors during application of the flame or if the fuse or circuit breaker opens.
) [& X& S/ L! k. A7 [; |=======================
: U2 |' j" F& n7 M7 B/ v5.2.6 Flex arcing test for Type HPN
===========================
5.2.6.2 Procedure
  t; {9 D6 _1 A3 v0 w: H3 ^0 L" sThe procedure shall be as follows:~

wangrang

標準有看過，其實只是沒有看過具體的測試，有點抽象...

& m1 |" v9 _4 T9 F6 z& d+ O) j呵呵，謝謝拉!

jack123456

我搞PVC电缆料，不知有什么可以帮上忙

李云峰

只要与UL电源线有关的测试疑问和经验,大家都可以在这里交流的!但是最重要的还是讨论实际测试方法和手段与标准的理解 !

yezi2008ltk

引用第43楼cableyzf于2007-08-10 14:31发表的  :
对，是最小截面积（最小厚度乘以宽度），平时都没注意。虽然UL1581没说，我查了一下JIS有规定最小厚度（JIS要求至少要测五个值）乘以宽幅得出截面积。检测标准这部分真的是越抠越细，所以这部分的讨论太重要了。谢谢版主！

" p9 r: q& f0 [2 P9 UＵＬ１５８１中有规定的：在标志线处，标志线内６ＭＭ及１９ＭＭ处共测试４点取最小值－－440.24 The thickness of the specimen is to be taken as the smallest of four measurements to 0.001 inchor 0.01 mm, two of which are to be made at 1/2-inch or 13-mm intervals between the bench marks on oneedge beginning 1/4 inch or 6 mm from either mark, with the other two measurements being made at　corresponding points on the opposite edge.

maq88

对于UL 可能是我最熟悉不过的,我们公司实验室申请的UL758,UL62,UL1581的目击测试已于2008年9月15日完成.是全球唯一一家可以做目击测试的公司.刚来公司,希望和大家交流交流.

雨花石

学习学习，我才作过两个电线的案子。