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考虑有三点-------取线三个中线径最大的：
1）如果是灯串：
The nominal cross-sectional area of the conductors shall not be less than the following values:
a) 0,5 mm2 for class II lighting chains with E5 or E10 lampholders or other small lampholders;
b) 0,75 mm2 for class II lighting chains with E14, E27, B15 or B22 lampholders and fitted with
series connected lamps;
c) 1,5 mm2 for class II lighting chains with E14, E27, B15 or B22 lampholders and fitted with
parallel connected lamps;
d) 0,5 mm2 for class III chains and parts of chains supplied by SELV and with a maximum
rated wattage exceeding 50 W;
e) 0,4 mm2 for class III chains and parts of chains supplied by SELV and with a maximum
rated wattage not exceeding 50 W;
f) 1 mm2 for the cable between the plug and a sealed chain without joints;
g) 1,5 mm2 for the cable between the plug and a sealed chain with joints.
2）针对吊灯：
– 0,75 mm2 for ordinary luminaires;
– 1,0 mm2 for other luminaires.
3）考虑电流，可以百度一下 （考虑线径和电流之间的对应关系）
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