|
|
CTL DSH 928 Question:" x! r4 l [, g" \
1) External parts of insulating material providing protection against electric shock or parts of1 i' m# n$ {, A) X( z
insulating material retaining current-carrying parts or SELV parts in position shall be subjected to
+ |2 f3 p$ u8 q3 o/ Zthe ball pressure test. Is the ball pressure test to be applied to soft thermoplastic parts which
- `2 L) p2 R: a( Sprovide reinforced insulation? If so, it would mean that soft thermoplastic material could never be
+ w* y; V2 w6 Y) U# hused, because on this type of material the diameter of the ball impression always exceed 2 mm?. X, \. \4 o) O8 `' {( C
2) Is the test applied on connectors moulded on cable or end cap used as reinforced insulation of7 F& t" E5 j. ^, _
lighting chain like sealed tube and on connectors which retain SELV parts of class III lighting1 t& Y' W9 g' U8 h+ n7 C
chain?* Y, j& M5 T* p3 _
Decision:+ x# p8 k* R5 I
1) If the results of the ball pressure tests do not comply with the requirement of the standard, soft& y+ G% }) o1 R' s$ V! c. x
thermoplastic materials shall not be used as reinforced insulation.
1 E/ C7 c& n/ ~/ \7 Y8 S; M2) Yes. |
|