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CTL DSH 928 Question:
' }: |$ a: A3 _, c4 y5 G i1) External parts of insulating material providing protection against electric shock or parts of
2 K- A9 e1 d9 w/ L% R. T$ V9 |0 kinsulating material retaining current-carrying parts or SELV parts in position shall be subjected to
: \: X* a. Z6 }& ~+ @the ball pressure test. Is the ball pressure test to be applied to soft thermoplastic parts which
* f4 f o* c$ Z* M! k. q& g: eprovide reinforced insulation? If so, it would mean that soft thermoplastic material could never be D) O7 ^/ }* [; Y
used, because on this type of material the diameter of the ball impression always exceed 2 mm?( G7 v2 h- m/ J2 y/ _# x4 W1 }
2) Is the test applied on connectors moulded on cable or end cap used as reinforced insulation of
; r0 U6 G$ b, Zlighting chain like sealed tube and on connectors which retain SELV parts of class III lighting
1 O4 V( P) I3 [+ ~' p! E" x8 |chain?1 o' u7 j" k0 {: P
Decision:# M: |. D. B( f8 s4 l$ H& u
1) If the results of the ball pressure tests do not comply with the requirement of the standard, soft
. V, b# M: H; b+ d7 ?+ x% p# B4 Fthermoplastic materials shall not be used as reinforced insulation." \( U" J) u( C- T& b% J2 t: H
2) Yes. |
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