可以看看 IEC60598-1的
0 s0 @* X4 E) O, u1 q# {& E5.3.1.2 For wiring which is connected to the fixed wiring via an internal current-limiting device% n, }; [% V$ t7 @: l5 f1 U, v" g
and limiting the current to 2 A maximum, e.g. lamp current control device, circuit cut-outs,
: k9 x; B' q+ [1 O8 ~: Xfuses, protective impedance or isolating transformers, the following is applicable
( l' a( A s7 i/ y5 Q+ q5 R* N6 V4 D– the minimum cross-sectional area which may be less than 0,4 mm2 shall be selected in
A$ e3 B1 S" @) u! rrelation to the maximum current during normal operating conditions and the time and level* \9 ^- C T" {0 H& V+ y) L
of the current flowing during failure conditions, owing to the fact that overheating of the wire, a' b7 P6 N: I8 S) L
insulation shall be prevented under any condition;
8 b! D: O# m \; D! v) M看看这段话啦,应该可以明白的 |