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CTL DSH 928 Question:/ X7 `# k9 ~3 }
1) External parts of insulating material providing protection against electric shock or parts of
" H8 A8 o6 B/ g9 ~- Binsulating material retaining current-carrying parts or SELV parts in position shall be subjected to
+ u5 t+ G' [- d0 J5 ^the ball pressure test. Is the ball pressure test to be applied to soft thermoplastic parts which) ?7 V" |4 O* W* L- a
provide reinforced insulation? If so, it would mean that soft thermoplastic material could never be
g. f3 v0 q& oused, because on this type of material the diameter of the ball impression always exceed 2 mm?
3 D) e' r# o( }( K0 }0 |4 o2) Is the test applied on connectors moulded on cable or end cap used as reinforced insulation of
6 ?, b- ^: B# u, klighting chain like sealed tube and on connectors which retain SELV parts of class III lighting
- B+ z# k+ w9 `chain?
5 s0 D/ W Z: e1 d: g! g! }5 {Decision:! n" @2 j6 c9 \4 L0 n1 Z" K
1) If the results of the ball pressure tests do not comply with the requirement of the standard, soft
8 h0 |3 R# J N7 i& cthermoplastic materials shall not be used as reinforced insulation.5 c. ^+ A: |' J5 \) W; j! A
2) Yes. |
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发表于 2014-6-27 11:26
