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4.9 Insulating linings and sleeves
$ l' Y" q( ?& L, m: j( L4.9.1 Insulating linings and sleeves shall be so designed that they are reliably retained in
_) A- o; N9 i7 ~3 d# ^position when switches, lampholders, terminals, wires or similar parts have been mounted.
) [4 p1 \3 T& F- gNOTE Self-hardening resins, such as epoxy resins, may be used to fix linings.
. s' Q2 O2 m' B6 |Compliance is checked by inspection and by manual test.$ I' f( J- e$ u* [
4.9.2 Insulated linings, sleeves and similar parts shall have adequate mechanical, electrical
5 S$ _5 Q" X; @/ M3 ?! A* H$ Wand thermal strength.! T b' Z S8 K* U
Compliance is checked by inspection, by manual test and by the electric strength test in
3 M4 v, \1 [. naccordance with Section 10. The thermal properties of wire and sleeve are checked in! m1 v8 M* y% [+ v' \' @- ]& F, q$ k
accordance with Section 12. Heat resistant sleeves used as covering for wires attaining a
, r) o6 b, \+ j. Z; ]5 ]/ ztemperature exceeding the values given in Table 12.2 of Section 12 shall comply with the
) t( d" Y( K" O( Z2 y, G; }requirements of IEC 60684, taking into account the temperature measured on the wire in' R: m/ M" J/ G3 ~* ^
question. The sleeve shall be resistant to a temperature exceeding the temperature measured
; }2 ]% s' R8 T/ t$ b+ Z9 i8 Bon the wire by 20 °C or withstand the following test:
! z0 q3 J4 y: ?) x3 M; m% E9 C T5 wa) Three test specimens of the sleeve, about 15 cm in length, are subjected to the humidity2 y0 U) A6 @, H, l* v7 X. `. T
test of 9.3 and subsequently to the insulation resistance and electric strength tests$ H _ l; s/ A5 h' K- D, T, K% Y( O
according to Section 10. A suitable uninsulated copper conductor or metal rod is passed
6 y( Z$ _+ u+ M+ o9 U- cthrough the specimens, and the outside is covered by a metal foil in such a way that no
/ t# N! @$ c5 f! I! m3 X5 H# j2 V1 Jflashover at the ends of the samples can occur. The measurement of the insulation9 Z6 M: {) l- N, @
resistance and the electric strength test is then made between the copper conductor/metal
6 U# O# Z* I4 I& R/ j/ grod and the metal foil.5 L6 K- Y" n) x, [8 A
b) After the copper conductors/metal rods and metal foils have been removed, the specimens N/ S/ K* o0 d) I7 Y* s& I
are placed in a heating cabinet for 240 h at a temperature of T + 20 °C, T being the
# t* l! r1 b; h7 |; v/ Pmeasured temperature of the wire.
K8 ?* |2 p. [8 [c) The specimens are allowed to cool to room temperature and are then prepared as indicated k; N4 j4 u+ m- ?
under item a) above.
* Z) a) z+ \& ?: dMeasurement of the insulation resistance and electric strength is then made between the
6 r8 @6 w, t, L8 Z4 Bcopper conductor/metal rod and the metal foil.9 {1 p3 \4 |8 v
Compliance is checked by the insulation resistance values and test voltages specified in
* ]% e9 {: U* J) h' ITables 10.1 and 10.2 in Section 10. |
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