【Daily Question】Utilities - Mechanical & Electrical - 20190227

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This post was last edited by hesonchang214 on 2019-2-27 at 13:07. Building lightning protection and grounding systems include (). A. Artificial grounding electrode B. Natural grounding electrode C. Lightning rod D. Lightning strip E. Lightning mesh 【Answer】AB 【Explanation】Grounding device: refers to a group of grounding electrodes buried at a depth of more than 0.7m below the ground, serving as electrodes for conducting lightning current into the ground. A ground device intentionally installed for this purpose is called an artificial grounding electrode. If reinforced concrete pile foundations of buildings, basement rebar, and buried metal pipes are used as dispersal electrodes for grounding systems, we refer to them as natural grounding elements; in addition, there are also specially manufactured products such as grounding modules.