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4.9 Insulating linings and sleeves9 m- h2 J; t' X7 a% w
4.9.1 Insulating linings and sleeves shall be so designed that they are reliably retained in
- J' K/ {. r4 X! n: J3 e9 \" ?" Y, }position when switches, lampholders, terminals, wires or similar parts have been mounted.% u8 y+ q- C7 u- C3 |5 k. k' H
NOTE Self-hardening resins, such as epoxy resins, may be used to fix linings.
/ `9 z; b) a3 z/ G) p1 q; U3 }# p, YCompliance is checked by inspection and by manual test.
3 q( l+ X: ]# s, L4.9.2 Insulated linings, sleeves and similar parts shall have adequate mechanical, electrical, I0 Q: g9 f* q. a
and thermal strength.
. q$ k* ?& `" u8 S; l! t* B3 K' z5 bCompliance is checked by inspection, by manual test and by the electric strength test in! G$ s) G/ f/ _" Y, e2 ~
accordance with Section 10. The thermal properties of wire and sleeve are checked in
2 ]: m7 a) T; T; Xaccordance with Section 12. Heat resistant sleeves used as covering for wires attaining a
4 f+ V5 U" Q3 U1 \% Gtemperature exceeding the values given in Table 12.2 of Section 12 shall comply with the3 G8 g; _; t5 `3 X' e9 k7 V8 T4 p4 w
requirements of IEC 60684, taking into account the temperature measured on the wire in
( {6 v. b- u# Q/ \0 h; Q6 Fquestion. The sleeve shall be resistant to a temperature exceeding the temperature measured+ a7 j0 W- a/ ]2 J% I' R& T! S; F2 m
on the wire by 20 °C or withstand the following test:
/ G6 b/ n0 F4 S" z0 [" b( fa) Three test specimens of the sleeve, about 15 cm in length, are subjected to the humidity% w4 d/ ^6 N. h5 h3 O% }7 S
test of 9.3 and subsequently to the insulation resistance and electric strength tests
5 k! Q! C1 n( Kaccording to Section 10. A suitable uninsulated copper conductor or metal rod is passed
6 z# h7 W9 L+ a' F8 z: v& xthrough the specimens, and the outside is covered by a metal foil in such a way that no3 m" c5 w( _% M. U# z: k
flashover at the ends of the samples can occur. The measurement of the insulation
9 A7 \9 v1 A8 N* r2 w* iresistance and the electric strength test is then made between the copper conductor/metal- _9 v% ?/ o( w9 A ]8 C: j7 Z* e
rod and the metal foil.
1 n6 B2 U. K5 n# ]8 Ab) After the copper conductors/metal rods and metal foils have been removed, the specimens
4 Z8 n% ~5 z Y2 F# S/ h$ s# xare placed in a heating cabinet for 240 h at a temperature of T + 20 °C, T being the
! O0 I8 l* r% p) G& k8 ?measured temperature of the wire.
( n$ E- b' o2 j6 A0 P% C: Dc) The specimens are allowed to cool to room temperature and are then prepared as indicated
; Q+ o3 O* I! \' B% Gunder item a) above.( A, U: f o& u
Measurement of the insulation resistance and electric strength is then made between the* \2 H1 t* k$ u& w- ~; j
copper conductor/metal rod and the metal foil.
# h ]6 w E5 S: s& \ y$ GCompliance is checked by the insulation resistance values and test voltages specified in, |/ \) l, Y }" N
Tables 10.1 and 10.2 in Section 10. |
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