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CTL DSH 928 Question:3 T7 }, B+ g8 Y5 n+ ?
1) External parts of insulating material providing protection against electric shock or parts of; j* S: [, `/ P+ }* b
insulating material retaining current-carrying parts or SELV parts in position shall be subjected to
; @, b; z3 g: Y; k& A# u2 C; pthe ball pressure test. Is the ball pressure test to be applied to soft thermoplastic parts which6 ?' Y# ]- y D7 u
provide reinforced insulation? If so, it would mean that soft thermoplastic material could never be3 `" K7 i8 G6 _% X! [; {
used, because on this type of material the diameter of the ball impression always exceed 2 mm?' i2 E6 x- I1 c: w
2) Is the test applied on connectors moulded on cable or end cap used as reinforced insulation of
2 D' {( ?( M* Flighting chain like sealed tube and on connectors which retain SELV parts of class III lighting
% c; f, B6 @ H' H/ T7 Ochain?
# n- k; `' n0 nDecision:
* h- \5 L. b8 L1 V, x0 `1) If the results of the ball pressure tests do not comply with the requirement of the standard, soft0 k1 C1 e! u- ]8 w3 ~8 G1 m
thermoplastic materials shall not be used as reinforced insulation.
! s/ D% ~( P8 R1 Q2) Yes. |
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