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CTL DSH 928 Question:
( M& x2 L4 \+ C b4 e+ e1) External parts of insulating material providing protection against electric shock or parts of
2 `* c7 N* H7 J) J! K: v$ t. Oinsulating material retaining current-carrying parts or SELV parts in position shall be subjected to
& O, ?7 s/ {9 g( T% r4 v# {4 kthe ball pressure test. Is the ball pressure test to be applied to soft thermoplastic parts which
4 k7 P0 Q/ B+ q% m4 K1 Uprovide reinforced insulation? If so, it would mean that soft thermoplastic material could never be
4 ?. _" v+ d% Q r9 l3 y6 ]9 xused, because on this type of material the diameter of the ball impression always exceed 2 mm?
+ ~$ T& H$ A0 W8 Y& X) |* X2 g2) Is the test applied on connectors moulded on cable or end cap used as reinforced insulation of& q u! g7 F: L
lighting chain like sealed tube and on connectors which retain SELV parts of class III lighting4 U2 s& k: _+ M. ~3 u( Q# s# }% B% d
chain?: C/ d3 ^6 u& J9 ]2 V9 X
Decision:
. X4 ^2 c, R; M4 p8 s1) If the results of the ball pressure tests do not comply with the requirement of the standard, soft3 q/ p# n2 P" L4 {0 X$ V3 Q- Z
thermoplastic materials shall not be used as reinforced insulation.
2 d2 T9 \. g/ f" t1 D7 \* P) u2) Yes. |
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发表于 2014-6-27 11:26
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