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CTL DSH 928 Question:% n9 c a8 d1 j) @& G T r
1) External parts of insulating material providing protection against electric shock or parts of' q) F( n/ o. m& A2 t. l$ `
insulating material retaining current-carrying parts or SELV parts in position shall be subjected to
6 m' \; j }7 x# u, t8 ?the ball pressure test. Is the ball pressure test to be applied to soft thermoplastic parts which
9 r+ w* p: M2 T- Z6 x$ S; q% y8 kprovide reinforced insulation? If so, it would mean that soft thermoplastic material could never be
8 f" R* w0 r! b0 Zused, because on this type of material the diameter of the ball impression always exceed 2 mm?
9 p; j2 Z/ ^7 Z2) Is the test applied on connectors moulded on cable or end cap used as reinforced insulation of
% m2 t0 Z6 u; s6 u- z1 qlighting chain like sealed tube and on connectors which retain SELV parts of class III lighting
1 n' b" F/ T. |0 E4 Lchain?$ M2 I1 W6 |3 w$ ^' A; h
Decision:$ I, h+ R& s% Y; v. ?& K
1) If the results of the ball pressure tests do not comply with the requirement of the standard, soft5 m3 n; D7 S+ I9 G! @2 t
thermoplastic materials shall not be used as reinforced insulation.( G1 R) n8 }2 K0 D7 H+ c+ `# ]
2) Yes. |
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