According to the re-earthing TN-C-S system adopted usually by foreign country, the paper analyses main function, value etc. of re-earthing resistance. These respects can be referenced for designer.
根据国外普遍采用重复接地TN C S系统的情况，分析重复接地电阻的主要作用、取值等有关问题，供建筑供电设计参考。
The earthing modes of TN-C, TN-S and TN-C-S systems are compared in this paper and the TN-C-S system is used widely because it has concluded to more advantages.
针对TN三种系统的接地型式，分别进行比较论述，提出TN-C-S系统因其优点较多，将得到广泛地应用。
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