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4.9 Insulating linings and sleeves
, |- P) e# \/ ]9 O, z7 T3 k+ w8 y4.9.1 Insulating linings and sleeves shall be so designed that they are reliably retained in
: a' \. C- _" B* C$ k1 O |position when switches, lampholders, terminals, wires or similar parts have been mounted." m3 o6 l& I0 F5 }& S
NOTE Self-hardening resins, such as epoxy resins, may be used to fix linings./ e: e3 {7 x0 x2 H* \
Compliance is checked by inspection and by manual test.
, i0 p$ j! o% J& Z* A4.9.2 Insulated linings, sleeves and similar parts shall have adequate mechanical, electrical4 L( K/ ?6 q; r7 A% v; Q
and thermal strength.
6 _1 g& X* \, b& U7 v/ n8 Z7 ^Compliance is checked by inspection, by manual test and by the electric strength test in
% t3 I K& {- x5 x3 z" k. oaccordance with Section 10. The thermal properties of wire and sleeve are checked in/ h& j4 G1 V) u) r
accordance with Section 12. Heat resistant sleeves used as covering for wires attaining a
) p# o* c2 c( Ftemperature exceeding the values given in Table 12.2 of Section 12 shall comply with the9 _4 j/ f' f' b% \5 `
requirements of IEC 60684, taking into account the temperature measured on the wire in
1 Y) m; T) m+ m1 A' ]8 L5 uquestion. The sleeve shall be resistant to a temperature exceeding the temperature measured, _+ B ?. _3 _" T
on the wire by 20 °C or withstand the following test:
8 k" O X/ a& ua) Three test specimens of the sleeve, about 15 cm in length, are subjected to the humidity6 _2 l4 X! U, e7 }
test of 9.3 and subsequently to the insulation resistance and electric strength tests
* u# b3 e/ a1 Raccording to Section 10. A suitable uninsulated copper conductor or metal rod is passed! O/ l- D' b! q9 h5 e9 s. o
through the specimens, and the outside is covered by a metal foil in such a way that no3 o) l* p+ P: D6 ~0 ^' b
flashover at the ends of the samples can occur. The measurement of the insulation: F% `9 V2 G* i9 V1 s
resistance and the electric strength test is then made between the copper conductor/metal
# }' G i, D3 K" ^+ Z& f$ srod and the metal foil.! J1 z: b/ y$ |# n( n% E9 ?
b) After the copper conductors/metal rods and metal foils have been removed, the specimens3 M* w5 S4 L( X7 n- \# K4 a7 M2 o
are placed in a heating cabinet for 240 h at a temperature of T + 20 °C, T being the
/ \7 y6 b: B; |8 L6 o, I' Nmeasured temperature of the wire.
6 ` {) q% _/ ]+ g2 U2 X4 w( nc) The specimens are allowed to cool to room temperature and are then prepared as indicated1 d, C( h+ v3 k: @" f \
under item a) above.7 L9 S2 i9 ]' O: w: d$ s
Measurement of the insulation resistance and electric strength is then made between the
% p8 |" r9 D5 k" F8 p1 r/ G! Bcopper conductor/metal rod and the metal foil.
: q! _' c! I4 I. vCompliance is checked by the insulation resistance values and test voltages specified in
+ z! C& v( O5 Z, W# d* YTables 10.1 and 10.2 in Section 10. |
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