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CTL DSH 928 Question:
/ G2 z% y5 t: F' q) H, T1) External parts of insulating material providing protection against electric shock or parts of
7 b' }6 F" V7 J* vinsulating material retaining current-carrying parts or SELV parts in position shall be subjected to
% }3 J8 B2 A6 H, w3 Athe ball pressure test. Is the ball pressure test to be applied to soft thermoplastic parts which
C. I& _. G5 I5 Qprovide reinforced insulation? If so, it would mean that soft thermoplastic material could never be* M1 E2 v. r2 U) t, v; Q; j
used, because on this type of material the diameter of the ball impression always exceed 2 mm?% e7 ]/ N# ^3 \9 o+ U
2) Is the test applied on connectors moulded on cable or end cap used as reinforced insulation of, {6 L' Q- U" s% V; m/ G! W
lighting chain like sealed tube and on connectors which retain SELV parts of class III lighting; x/ u' S( E# F& G7 {/ D
chain?1 f% N0 w! U7 j' L
Decision:
4 P) J. w" }. h' j1 U4 ~5 ~1) If the results of the ball pressure tests do not comply with the requirement of the standard, soft
* m! Y5 f9 @3 _$ o1 X3 Z1 p# d7 \thermoplastic materials shall not be used as reinforced insulation.- s& q; P' j0 X, J# Y8 C+ c
2) Yes. |
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