為了降低建築物遭受雷擊時，家電及電氣設備的破壞，避雷針下引線必須能及時洩放雷電流，因而下引線裝設的位置成為能及時洩放雷電流的方法。本文討論避雷針下引線裝設位置,經實驗分析結果，建議於無水泥下將下引線裝置於建築物梁柱箍筋之外較為理想，本實驗採用高壓電對鋼筋結構進行雷擊放電模擬，並使用高頻比流器實際測量避雷針下引線對鋼筋結構箍筋之感應。實驗中紀錄下引線裝置於梁柱箍筋之內、箍筋長邊之外側與箍筋短邊之外側時，箍筋之感應電流，藉以探討箍筋感應電流之數據與特性。以無水泥下之梁柱量測其結果顯示下引線設置於建築物梁柱箍筋之外，其洩放電流與電功率都能有效的釋放，進而使建築物內之電氣設施受到保護；此實驗亦証明目前施工方式有其改善之空間。

Adjustment of the installation position of a grounding wire of lightning rod is a solution to reduce the destruction of appliances and electrical equipments as the building was struck by lightning. This thesis is a study of the location of the lightning rod grounding wire set. The analysis suggests that the ground wire had better be outside the building stirrups without concrete. This experiment uses series of high voltage discharge circuit to simulate lightning stroke to reinforced structures, and uses the high frequency current transformer (HFCT) to measure the induction of grounding wire to stirrups of reinforced structures. It investigates the induction of grounding wire placed within or outside the stirrups. The grounding wire outside should be located at long and short side of stirrup. The measurement and records are used to analyze the data and characteristics of the induced current. The result shows when grounding wire is set outside the building beams and columns stirrups without concrete, the surge current and power can be effectively released, and thus make the electrical facilities within the building be protected. This experiment also shows that a further improvement is required for current construction methods.

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