可以看看 IEC60598-1的; D1 Q% j* b6 z' V* e0 m/ {! y, h
5.3.1.2 For wiring which is connected to the fixed wiring via an internal current-limiting device! ~" W3 k7 Q' h/ \
and limiting the current to 2 A maximum, e.g. lamp current control device, circuit cut-outs,
1 H" c( j# M/ J) f; o D4 W; Qfuses, protective impedance or isolating transformers, the following is applicable
z: c- Y: b5 F5 z. D: z9 j– the minimum cross-sectional area which may be less than 0,4 mm2 shall be selected in
+ W1 n y& G) S: B4 D- y, grelation to the maximum current during normal operating conditions and the time and level
! H; o2 h3 i' b1 V; [6 y! z6 _of the current flowing during failure conditions, owing to the fact that overheating of the wire
6 l2 F9 B' b, l8 Oinsulation shall be prevented under any condition;$ [3 _4 d+ C+ C1 y
看看这段话啦,应该可以明白的 |