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以TN系统为例从三个方面分别叙述了总等电位联结，局部等电位联结在住宅电气安全中的作用以及在住宅配电系统中的设计原则和作法。
The TN system is taken as an example to describe the function of total equipotential bonding, local equipotential bonding in residential electrical safety and the design principles and practices in residential distribution system respectively from three aspects.