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CTL DSH 928 Question:" d4 x9 f8 [; w# p6 t- ]+ {
1) External parts of insulating material providing protection against electric shock or parts of& r) V; J( m9 E# |6 q0 Q/ q
insulating material retaining current-carrying parts or SELV parts in position shall be subjected to! K$ a v9 D6 a
the ball pressure test. Is the ball pressure test to be applied to soft thermoplastic parts which6 z( L. q9 T9 Z2 P; W
provide reinforced insulation? If so, it would mean that soft thermoplastic material could never be; q* O6 z0 g$ |- n: J, z% R
used, because on this type of material the diameter of the ball impression always exceed 2 mm?
0 z/ ^ a% b1 W; J; U2) Is the test applied on connectors moulded on cable or end cap used as reinforced insulation of7 B {( e- a& _! Z" z
lighting chain like sealed tube and on connectors which retain SELV parts of class III lighting
' L5 q' Z3 e4 y. Gchain?, \: N7 {& j5 b# [$ a/ w6 J7 P# L
Decision:
! I2 [4 d% n0 x8 Q4 Z N. g1) If the results of the ball pressure tests do not comply with the requirement of the standard, soft
3 r, P4 J8 ]/ C% N9 P' F9 Sthermoplastic materials shall not be used as reinforced insulation.0 t& C/ J% B" c& [2 D% p8 P: E1 W
2) Yes. |
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