可以看看 IEC60598-1的
7 |* i, R, @, Z+ Z" R* H5.3.1.2 For wiring which is connected to the fixed wiring via an internal current-limiting device
! H6 I j" f* `3 j J9 E9 _, I. Iand limiting the current to 2 A maximum, e.g. lamp current control device, circuit cut-outs,% r. M. Q' i* R8 ^9 C v& t
fuses, protective impedance or isolating transformers, the following is applicable5 h) `- D5 _# Q. X
– the minimum cross-sectional area which may be less than 0,4 mm2 shall be selected in6 u' R7 ~; w5 L, _
relation to the maximum current during normal operating conditions and the time and level
' _7 H8 s/ A1 P* B1 Uof the current flowing during failure conditions, owing to the fact that overheating of the wire g8 b; W: q9 b* E+ h
insulation shall be prevented under any condition;$ p) G! a k: C* Y0 H$ U, E3 p
看看这段话啦,应该可以明白的 |