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CTL DSH 928 Question:
, S) Z" ^# |8 f [4 h# A* h4 j1) External parts of insulating material providing protection against electric shock or parts of5 Z5 L/ u( n* F6 ~
insulating material retaining current-carrying parts or SELV parts in position shall be subjected to( J1 a: m; q/ T$ J- y' R' u
the ball pressure test. Is the ball pressure test to be applied to soft thermoplastic parts which
) ^' h; [( Z2 |4 Rprovide reinforced insulation? If so, it would mean that soft thermoplastic material could never be2 p' @9 ^; J% T9 b
used, because on this type of material the diameter of the ball impression always exceed 2 mm?0 n% w1 S u/ h
2) Is the test applied on connectors moulded on cable or end cap used as reinforced insulation of/ m5 I" t4 ~1 X2 @$ s
lighting chain like sealed tube and on connectors which retain SELV parts of class III lighting1 n0 |5 E0 P: V+ F
chain?6 s Y6 g) A3 Q3 O
Decision:3 X; g1 H9 ?. g# |( d0 s
1) If the results of the ball pressure tests do not comply with the requirement of the standard, soft+ H4 P6 W2 \$ n
thermoplastic materials shall not be used as reinforced insulation.
: @& |( M7 ]6 }& Z, v3 X8 t2) Yes. |
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