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CTL DSH 928 Question:
( Q7 S k+ r O: |# O. N1) External parts of insulating material providing protection against electric shock or parts of
+ `, T. Q. S: \9 ?; H0 pinsulating material retaining current-carrying parts or SELV parts in position shall be subjected to: t( u% B+ Z; z4 u; O
the ball pressure test. Is the ball pressure test to be applied to soft thermoplastic parts which
8 d% }# m' Y, F% I/ ]provide reinforced insulation? If so, it would mean that soft thermoplastic material could never be7 A& k& P* R$ @. q2 X: L
used, because on this type of material the diameter of the ball impression always exceed 2 mm?
2 a( \) R: z! i9 {3 f* t# D) l8 x2) Is the test applied on connectors moulded on cable or end cap used as reinforced insulation of# A+ c. ^" i* l5 D& N' C
lighting chain like sealed tube and on connectors which retain SELV parts of class III lighting
/ p, C8 [" I/ [. E3 |4 W- f+ xchain?
3 r) v8 n9 o, s. z+ d3 G: YDecision:( N' _+ [' f7 w. i N1 w( [
1) If the results of the ball pressure tests do not comply with the requirement of the standard, soft3 Q$ k" }+ A d2 t: B
thermoplastic materials shall not be used as reinforced insulation.
- P# r+ j$ q: Y! I2) Yes. |
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