传统上，我们使用一根置于空气中的金属终端【富兰克林避雷针】和一条与集成的接地装置连在一起的下导线路来保护建筑物。
Traditionally structures have been protected by the use of air terminals (Franklin Lightning Rods) and a network of downconductors connecting to an integrated grounding system.
注2：PEN导线是指将保护导线和中性导线两种功能结合在一起的保护接地中性线。
NOTE 2 A PEN conductor is a protective earthed neutral conductor combining the functions of both a protective conductor and a neutral conductor.
注2：PEN导线是指将保护导线和中性导线两种功能结合在一起的保护接地中性线。
NOTE 2 A PEN conductor is a protective earthed neutral conductor combining the functions of both a protective conductor and a neutral conductor.
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