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4.9 Insulating linings and sleeves! u) M. c7 \; t) X- B: x7 n: Q; }
4.9.1 Insulating linings and sleeves shall be so designed that they are reliably retained in7 B- L: Q- @6 K% Z- O
position when switches, lampholders, terminals, wires or similar parts have been mounted.
: z' Q. q* d& v1 l7 hNOTE Self-hardening resins, such as epoxy resins, may be used to fix linings.1 \+ I A% Y* y! z4 _9 h4 P( n
Compliance is checked by inspection and by manual test.
* B, f6 [' x! @9 j& P0 [9 ~, [2 ]1 B% P% ^; c4.9.2 Insulated linings, sleeves and similar parts shall have adequate mechanical, electrical: w1 \. P/ E7 g; c5 G
and thermal strength.- I9 L# A* A+ v
Compliance is checked by inspection, by manual test and by the electric strength test in7 P3 @* w1 z0 A( p; B
accordance with Section 10. The thermal properties of wire and sleeve are checked in! F. k' p' B" ]* ^) N! A
accordance with Section 12. Heat resistant sleeves used as covering for wires attaining a
8 }' x5 B3 H# Wtemperature exceeding the values given in Table 12.2 of Section 12 shall comply with the
; X: O* |" S, N: Arequirements of IEC 60684, taking into account the temperature measured on the wire in
/ N ], L9 R) v6 Iquestion. The sleeve shall be resistant to a temperature exceeding the temperature measured
/ v- V' ^* d# B- g7 [on the wire by 20 °C or withstand the following test:' e' {& d- U( g& ~; b v0 w8 D+ q
a) Three test specimens of the sleeve, about 15 cm in length, are subjected to the humidity% `! z0 C0 C/ X5 w
test of 9.3 and subsequently to the insulation resistance and electric strength tests5 r# N+ W) `! V7 M
according to Section 10. A suitable uninsulated copper conductor or metal rod is passed6 v B0 H$ W! ~8 f1 K+ }8 o1 Q
through the specimens, and the outside is covered by a metal foil in such a way that no6 Z- a: ~6 j- o5 s6 ~, f/ T
flashover at the ends of the samples can occur. The measurement of the insulation
, _4 \5 ~* H$ d3 Z$ fresistance and the electric strength test is then made between the copper conductor/metal
: L0 u% d5 }) n- [( Crod and the metal foil.
' J* D% ~: ^4 q" d# ]. N s! Db) After the copper conductors/metal rods and metal foils have been removed, the specimens- b; i0 ?; f, T8 t3 X$ K
are placed in a heating cabinet for 240 h at a temperature of T + 20 °C, T being the# t7 J P8 y/ g
measured temperature of the wire.* }) {- K' I+ F) E
c) The specimens are allowed to cool to room temperature and are then prepared as indicated: y' z. ]% b+ k: C, u5 o$ w1 n
under item a) above.9 e( y6 [1 E# V3 Y$ T" |: P% e
Measurement of the insulation resistance and electric strength is then made between the
7 E2 t# r B# }" vcopper conductor/metal rod and the metal foil.
0 s9 I$ Q. W( K; r+ j3 c! {Compliance is checked by the insulation resistance values and test voltages specified in) d" _% }. w0 M, d9 ^# z* \
Tables 10.1 and 10.2 in Section 10. |
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