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我认为各个标准会有不同的要求，所以想得出一个统一的答案是比较困难的。
$ m' v% v4 R0 b仅以IEC 60598-1为例：- M* s4 A3 X4 D. G y0 W. |* G
1. 套管安装：
) {3 r% [/ F7 f% H4.9.1 Insulating linings and sleeves shall be so designed that they are reliably retained in4 n, h5 g5 @9 U4 {$ T+ p! }+ w
position when switches, lampholders, terminals, wires or similar parts have been mounted.
7 i# i$ H2 O; ^# z
8 C4 Q0 ?( @+ K5 h2. 用于温度保护功能：
9 K: W% r! @! g$ d0 U4.7.5 If the external wiring or supply cord is unsuitable for the temperatures reached inside# ?" J3 g% V+ { \+ d0 N
the luminaire, either a connection shall be provided at the point of entry of the external wiring
; j) H" j& @' vinto the luminaire for the use of heat-resistant wiring after this point, or heat-resisting parts4 b* _: g9 T0 U' ~1 e
shall be supplied with the luminaire to cover the part of the wiring placed inside it, which8 D0 i$ `; [. \- ~$ L4 ^( f1 G/ |( t
exceeds the wiring temperature limit.' t. m. X3 ]3 ]. j8 K+ z' M, S. ]
7 @5 K& s1 T u
3. 类似的绝缘功能（具体是基本绝缘，附加绝缘或是加强绝缘看材料达到的测试等级）
3 B- h/ K3 w* X1 I4.9.2 Insulated linings, sleeves and similar parts shall have adequate mechanical, electrical
" ~# U T( I' @- Mand thermal strength.
' s& c* v* r! g" r' k( ?/ _Compliance is checked by inspection, by manual test and by the electric strength test in
9 C2 Q K% s) \: W8 v: Yaccordance with Section 10. The thermal properties of wire and sleeve are checked in( w3 d) V1 P' z/ L
accordance with Section 12. Heat resistant sleeves used as covering for wires attaining a2 B9 J* v H- Y, t$ F
temperature exceeding the values given in Table 12.2 of Section 12 shall comply with the' j1 E; i1 ]- A9 D W
requirements of IEC 60684, taking into account the temperature measured on the wire in5 K3 z9 ~) m, x( k
question. The sleeve shall be resistant to a temperature exceeding the temperature measured/ m, [- B4 X: C: m, [
on the wire by 20 °C or withstand the following test（潮态处理，温度处理，耐压测试，泄漏电流测量）
; B& ~( V/ W+ v
4 Q, W; R2 G' J' ]4. 套管厚度，在IEC60598里面没有相应条款指出，是否可用电线绝缘层厚度做参考，我认为不合适。: D* y' o& S6 e: ^* f: r
附电线的绝缘层厚度：
8 O- B' V. ^' ^1 E/ `5.3.1.1 For wiring which is directly connected to the fixed wiring, e.g. via a terminal block, and
2 t* f7 l1 O! J) O Y* r5 T) Rthe disconnection from the mains is relied upon by the external protection device(s), the0 H6 n$ ?. ^& g" _/ z
following is applicable:+ ^5 h" b' m& E* S
For normal operating currents higher than 2 A:
$ T. ?! z' d8 Z$ t! F7 A: ^) p– nominal cross-sectional area: minimum 0,5 mm2,( X7 z B6 y8 Q7 ~; A' [3 @$ U7 |: B* p
– for through-wiring of fixed luminaires: minimum 1,5 mm2,
% B& t4 e+ v; y$ s– nominal insulation thickness: minimum 0,6 mm (PVC or rubber).7 B& b1 _" a/ j2 |/ w! q3 I
For mechanical protected wiring carrying normal operating currents lower than 2 A:
) Y& s& U! P' f* V* C: }– nominal cross-sectional area: minimum 0,4 mm2,
; \& e* V2 h4 t6 S– nominal insulation thickness: minimum 0,5 mm (PVC or rubber). |
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发表于 2011-6-24 12:46
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