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CTL DSH 928 Question:9 E: m4 [9 x5 N) D; a8 ^
1) External parts of insulating material providing protection against electric shock or parts of
- D# T" M5 }# u3 Iinsulating material retaining current-carrying parts or SELV parts in position shall be subjected to/ k1 O; d8 V- F1 r4 J) h
the ball pressure test. Is the ball pressure test to be applied to soft thermoplastic parts which$ j2 L8 V9 t% ]& T
provide reinforced insulation? If so, it would mean that soft thermoplastic material could never be
# P8 i. W3 R& g0 V9 J F3 tused, because on this type of material the diameter of the ball impression always exceed 2 mm?% v8 N" Y) i# n2 w
2) Is the test applied on connectors moulded on cable or end cap used as reinforced insulation of2 v; h( t, t* m! k8 Z, P6 l
lighting chain like sealed tube and on connectors which retain SELV parts of class III lighting6 `; g: ?( S2 ]9 _
chain?/ c0 W6 m2 e& y( }( h0 W1 ~2 |
Decision:% Y6 O4 c( G3 |& N7 U; l+ t' ^. p
1) If the results of the ball pressure tests do not comply with the requirement of the standard, soft8 ^* a" f# s2 E& b7 c
thermoplastic materials shall not be used as reinforced insulation." C7 N; ^( D8 W; z
2) Yes. |
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