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CTL DSH 928 Question:
2 }+ J% u$ X4 x- ^4 }* b1) External parts of insulating material providing protection against electric shock or parts of5 ]# g$ ^' D9 `; G5 P' X y
insulating material retaining current-carrying parts or SELV parts in position shall be subjected to
! D I* ]6 d) B! x1 @2 R, D; Othe ball pressure test. Is the ball pressure test to be applied to soft thermoplastic parts which
% }( |; Z$ z- D4 N* fprovide reinforced insulation? If so, it would mean that soft thermoplastic material could never be% s2 V0 z+ F/ k, K% @( p
used, because on this type of material the diameter of the ball impression always exceed 2 mm?$ x5 [$ p) y! w8 p+ d) A/ _2 l& {
2) Is the test applied on connectors moulded on cable or end cap used as reinforced insulation of
, ], `; l9 i% F+ i" ]lighting chain like sealed tube and on connectors which retain SELV parts of class III lighting( k- \' e2 }- j' h* U6 Y
chain?$ ~! V( o+ E9 z" g; ^7 _& ]- [
Decision:
- U4 D8 I4 e' Y. e1) If the results of the ball pressure tests do not comply with the requirement of the standard, soft
. C7 Y: h, c: x" P1 ~8 d6 Mthermoplastic materials shall not be used as reinforced insulation.
6 F8 b8 i: c5 {5 {3 ^( J; s) q2) Yes. |
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发表于 2014-6-27 11:26
