[請問] 電源開關 關掉還有電壓
想加裝一個燈具，於是打開天花板蓋子有這些線
打開開關量測了最長的兩條，白色與藍色的電位差是112伏特
關掉後量測還有約30伏特，請問這樣是正常的嗎?
還是要從其他線去接呢?
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