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4.9 Insulating linings and sleeves
0 f- y+ L- Q8 T" x* N4.9.1 Insulating linings and sleeves shall be so designed that they are reliably retained in
& _, u$ V1 ~9 c; j0 M* qposition when switches, lampholders, terminals, wires or similar parts have been mounted.
& k" U1 d' {; k/ `, G6 v- JNOTE Self-hardening resins, such as epoxy resins, may be used to fix linings.4 E% f9 ]! _0 a. E& J
Compliance is checked by inspection and by manual test.
2 E6 `3 e4 C6 R: t% @5 R+ s4.9.2 Insulated linings, sleeves and similar parts shall have adequate mechanical, electrical
5 m2 f6 N+ a# T" m. p- ^) y6 a: t$ Fand thermal strength.+ ~, F; Y/ ~4 `1 e# c
Compliance is checked by inspection, by manual test and by the electric strength test in
# H/ _3 |6 c) b3 d' |( qaccordance with Section 10. The thermal properties of wire and sleeve are checked in3 }7 `5 X* P# m) b$ Q# H. `
accordance with Section 12. Heat resistant sleeves used as covering for wires attaining a
8 m' Y- |! D3 D, m% Vtemperature exceeding the values given in Table 12.2 of Section 12 shall comply with the6 |. k1 @! c0 ?% F
requirements of IEC 60684, taking into account the temperature measured on the wire in% [6 \) N" C- g6 f/ o( L8 ^
question. The sleeve shall be resistant to a temperature exceeding the temperature measured0 p% e4 H6 X* A2 }( |% ]
on the wire by 20 °C or withstand the following test:. ?) k+ z: g) q- `4 f+ W& V4 U
a) Three test specimens of the sleeve, about 15 cm in length, are subjected to the humidity
H K+ X5 Q$ x5 K: i; T0 I Rtest of 9.3 and subsequently to the insulation resistance and electric strength tests! {- m0 p4 o# f4 w4 K
according to Section 10. A suitable uninsulated copper conductor or metal rod is passed5 T- p5 l' b, i5 U6 P
through the specimens, and the outside is covered by a metal foil in such a way that no
) u, }1 X3 }: {2 O( [flashover at the ends of the samples can occur. The measurement of the insulation
( V; ]3 Y+ H- A3 Y( h, Qresistance and the electric strength test is then made between the copper conductor/metal
% }# U2 a: M/ y" ~' g7 krod and the metal foil.: z0 D; }# \2 {' A
b) After the copper conductors/metal rods and metal foils have been removed, the specimens1 P6 g; D* T3 ^" n+ T9 s Y
are placed in a heating cabinet for 240 h at a temperature of T + 20 °C, T being the- R7 m: Q$ }; D, V+ B
measured temperature of the wire.# ~4 Y } ` e
c) The specimens are allowed to cool to room temperature and are then prepared as indicated
- R5 v( M' `: Y8 w- [under item a) above.' F! ?8 z/ n! q4 ^4 u
Measurement of the insulation resistance and electric strength is then made between the
# D( `1 N/ N" b7 v( m" Vcopper conductor/metal rod and the metal foil.
# \# V2 h& N6 t- Z" dCompliance is checked by the insulation resistance values and test voltages specified in
$ U5 j: k' j( ZTables 10.1 and 10.2 in Section 10. |
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