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Lightning weather often induces hazards to electrical systems. A lightning induced electrical system accident is studied in detail, which happened at the electronic pile examination spot for car drivers in Weihai. The structure of the electronic piles, the layout of lines, and the measures of lightning protection are investigated. Based on the assessment of lightning risk, combined with the safety standards and the features of the examination spot, the design of lightning protection scheme for the electronic pile examination spot is given. The direct lightning protection and induction lightning protection design are discussed emphatically. The examination spot signal lines within the system, the office building monitoring system, the control room grounding system are reasonably designed. The lightning protection design of electrical systems is also discussed, and the results can be used as references for electrical system lightning protection design.