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CTL DSH 928 Question:
6 D, m2 v, i% z8 u: d0 o9 a1) External parts of insulating material providing protection against electric shock or parts of# t' B3 y0 l/ N; d9 {" M* k
insulating material retaining current-carrying parts or SELV parts in position shall be subjected to* O8 i0 P- c7 x S5 U
the ball pressure test. Is the ball pressure test to be applied to soft thermoplastic parts which
* P1 y+ F L+ {) C u* C; ?2 Jprovide reinforced insulation? If so, it would mean that soft thermoplastic material could never be2 d; Q0 F- d" T6 w$ y8 J' w
used, because on this type of material the diameter of the ball impression always exceed 2 mm?1 I& H7 W0 H- m; a
2) Is the test applied on connectors moulded on cable or end cap used as reinforced insulation of1 M" {1 w1 B0 z3 z4 N3 t2 J
lighting chain like sealed tube and on connectors which retain SELV parts of class III lighting8 K2 i @- T! o k& t) l8 B3 |
chain?
( N, X/ ~7 {) Z5 ]& S; t% A$ J1 KDecision:1 d6 V. C. A# o6 j! o# O
1) If the results of the ball pressure tests do not comply with the requirement of the standard, soft6 `+ h1 M2 [* y: n
thermoplastic materials shall not be used as reinforced insulation.5 J5 f; q$ b8 _" {6 ]
2) Yes. |
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