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4.9 Insulating linings and sleeves
5 g1 M: a5 _3 I/ K$ J4.9.1 Insulating linings and sleeves shall be so designed that they are reliably retained in
6 w m1 Y' `/ |$ Z% Q3 s9 F9 x) Lposition when switches, lampholders, terminals, wires or similar parts have been mounted.0 B" M- E( V. D, t, B
NOTE Self-hardening resins, such as epoxy resins, may be used to fix linings.. N' v& E- V; u8 I
Compliance is checked by inspection and by manual test.
# I3 y8 L2 |+ i9 F# F. D4.9.2 Insulated linings, sleeves and similar parts shall have adequate mechanical, electrical
' l9 v# f4 {- l! h% b$ S- zand thermal strength.+ N) r7 b1 k& x0 w
Compliance is checked by inspection, by manual test and by the electric strength test in
1 }9 b, `% i/ V" paccordance with Section 10. The thermal properties of wire and sleeve are checked in' @( X, Z1 p4 I7 s
accordance with Section 12. Heat resistant sleeves used as covering for wires attaining a
7 T9 P; O2 Y- o+ t8 k+ ]0 Jtemperature exceeding the values given in Table 12.2 of Section 12 shall comply with the6 c( N% Y* _! M; V( Z
requirements of IEC 60684, taking into account the temperature measured on the wire in% L/ i1 I y' d- X% b( l' N5 q7 ]
question. The sleeve shall be resistant to a temperature exceeding the temperature measured
1 M4 b9 V' P9 k' O& O* C' ?. \on the wire by 20 °C or withstand the following test:: w$ u5 G( F. y6 O( @0 p* f' E( \7 j
a) Three test specimens of the sleeve, about 15 cm in length, are subjected to the humidity0 U; N" |6 J9 w. T
test of 9.3 and subsequently to the insulation resistance and electric strength tests# t- _* b- H$ }7 c! p+ D& A) C: t" F" G
according to Section 10. A suitable uninsulated copper conductor or metal rod is passed5 `, ^4 \# H, p
through the specimens, and the outside is covered by a metal foil in such a way that no
; ^/ N9 C, A# N8 J2 jflashover at the ends of the samples can occur. The measurement of the insulation
/ c- a( Z' j6 L+ u' cresistance and the electric strength test is then made between the copper conductor/metal
7 \+ H6 _" Y0 \! R) L8 ~7 Urod and the metal foil.
0 z$ E1 S2 t' k& W3 b4 @# G2 Ib) After the copper conductors/metal rods and metal foils have been removed, the specimens
' n3 S6 H7 E7 C2 G: `8 M- _are placed in a heating cabinet for 240 h at a temperature of T + 20 °C, T being the' |0 {9 k4 L; S: S+ X1 o
measured temperature of the wire.
. m1 C: u. U# e P; Y2 g! s0 A7 W& [; Yc) The specimens are allowed to cool to room temperature and are then prepared as indicated1 m( V+ x5 B' M3 a+ M
under item a) above.# ?8 r- h p6 Q
Measurement of the insulation resistance and electric strength is then made between the
, a; X- t! D. [9 \+ F0 j1 ccopper conductor/metal rod and the metal foil.
- O+ ^$ E( W( c; qCompliance is checked by the insulation resistance values and test voltages specified in
f- A. d: t e& O+ xTables 10.1 and 10.2 in Section 10. |
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