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CTL DSH 928 Question:
* N |& p4 l5 W' l, x1) External parts of insulating material providing protection against electric shock or parts of5 Z! [' B/ `# T
insulating material retaining current-carrying parts or SELV parts in position shall be subjected to
- u5 Z& u1 D6 P* v5 }! f3 tthe ball pressure test. Is the ball pressure test to be applied to soft thermoplastic parts which
; v5 x* S. \4 K" s& ~! Y" Z2 Dprovide reinforced insulation? If so, it would mean that soft thermoplastic material could never be* T; p0 m* I, w6 X
used, because on this type of material the diameter of the ball impression always exceed 2 mm?
. \7 a) b: W6 b9 s! P% V2) Is the test applied on connectors moulded on cable or end cap used as reinforced insulation of* m# y8 U) k7 z' n' `3 L7 K
lighting chain like sealed tube and on connectors which retain SELV parts of class III lighting4 y; s; e; l/ T9 i! Q
chain?
2 {% l5 w& J7 PDecision:& ? T2 y3 R8 W+ M4 h* a
1) If the results of the ball pressure tests do not comply with the requirement of the standard, soft7 G J7 L, `" f9 X) j. u2 X
thermoplastic materials shall not be used as reinforced insulation.
8 P1 p! f0 n! [( f# D# b: c9 N" l2) Yes. |
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