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4.9 Insulating linings and sleeves
1 O5 J- q- i/ D% f/ G: o4.9.1 Insulating linings and sleeves shall be so designed that they are reliably retained in
3 o3 k6 k2 g; K2 J6 T6 ~1 Zposition when switches, lampholders, terminals, wires or similar parts have been mounted.
+ q' M. n& R9 o7 A& _7 UNOTE Self-hardening resins, such as epoxy resins, may be used to fix linings.) {2 l' x/ k5 i( d
Compliance is checked by inspection and by manual test.
" d( d- q, q; h" N! o/ L4.9.2 Insulated linings, sleeves and similar parts shall have adequate mechanical, electrical& V5 T) o3 ?% Y8 H6 g
and thermal strength.4 s4 q) B. J7 w6 _# ?
Compliance is checked by inspection, by manual test and by the electric strength test in; q3 y( T5 g. V: m( O6 H) r
accordance with Section 10. The thermal properties of wire and sleeve are checked in
3 e/ `1 D1 N* N7 Q. Saccordance with Section 12. Heat resistant sleeves used as covering for wires attaining a" [4 Y: Q8 U/ x) @2 c
temperature exceeding the values given in Table 12.2 of Section 12 shall comply with the9 p* A H6 _% [+ Y& t, C' s4 U
requirements of IEC 60684, taking into account the temperature measured on the wire in7 T6 T4 c. l, d& A( a3 P2 I
question. The sleeve shall be resistant to a temperature exceeding the temperature measured8 T# u/ h$ t0 [- K9 m3 g
on the wire by 20 °C or withstand the following test:
3 W1 i: I' Y, u( @& j& m* R6 Fa) Three test specimens of the sleeve, about 15 cm in length, are subjected to the humidity/ v1 ]+ Y* A* W6 U/ x; e5 t
test of 9.3 and subsequently to the insulation resistance and electric strength tests0 k! i; X6 p# q" W
according to Section 10. A suitable uninsulated copper conductor or metal rod is passed5 u) u( x+ t) D9 y
through the specimens, and the outside is covered by a metal foil in such a way that no$ ^ k" \6 w) G+ S
flashover at the ends of the samples can occur. The measurement of the insulation2 T7 F+ R e3 u) P8 T
resistance and the electric strength test is then made between the copper conductor/metal! P9 X9 |2 g& h# F0 f {3 r
rod and the metal foil." [6 ~& V" F3 I3 t" N9 q
b) After the copper conductors/metal rods and metal foils have been removed, the specimens& O. Q, s7 b0 ? |6 X/ A% R
are placed in a heating cabinet for 240 h at a temperature of T + 20 °C, T being the
# g* E" w& _6 Vmeasured temperature of the wire. Y5 ~5 y) M; s" H+ e. U2 w
c) The specimens are allowed to cool to room temperature and are then prepared as indicated3 a$ V K$ P& m: {1 n* I
under item a) above.
4 k& a0 E4 @, X+ v; m& BMeasurement of the insulation resistance and electric strength is then made between the( s' O9 l! f! |/ p; o# v
copper conductor/metal rod and the metal foil.
3 N* m1 d$ P, o* @- K$ \Compliance is checked by the insulation resistance values and test voltages specified in, E, r7 x) [4 s6 J4 U. K7 g( {
Tables 10.1 and 10.2 in Section 10. |
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