Cl.27.5NOTE 2 The resistance of the Supply cord is not inculded in the measurement.
所以，无论什么类型连接的电源线的阻值是不包含在内的！
灯具的标准里面好像从来没有这么说过。你应用的这条应该不是598里面的条文吧。
Cl 7.2.3 Note: In the case of a luminaire with a non-detachable flexible cable for the supply
connection, the earthing contact is at the plug or supply end of the flexible cable or cord.
就是说只要灯具使用的是不可拆卸的软线作为供电连接的话，那接地电阻就要把线的电阻也算进去。作者: suqaxs 时间: 2012-1-18 19:36
LZ问的是灯具,楼上的怎么拿335的标准来说呢?作者: 十目右弓 时间: 2012-1-18 19:36
A current of at least 10 A, derived from a source with a no-load voltage not exceeding 12 V,
shall be passed between the earthing terminal or earthing contact and each of the accessible
metal parts in turn.
The voltage drop between the earthing terminal or earthing contact and the accessible metal
part shall be measured and the resistance calculated from the current and the voltage drop. In
no case shall the resistance exceed 0,5 Ω. When type testing, the current shall be applied for a
period of at least 1 min.
NOTE In the case of a luminaire with a non-detachable flexible cable for the supply connection, the earthing
contact is at the plug or supply end of the flexible cable or cord.