一些地区建造的农房,没有经过正式设计,照明线路暗装时,为节省资金,往往省去必要的硬塑料管等绝缘材料,而把导线直接塞在墙缝内,或用铁钉把导线钉在墙上、地上。当内墙抹灰或做地面时,导线反复受到机械的碰撞、磨擦和石灰、砂浆等的化学侵蚀,其绝缘层容易产生破损。导线如有破损,当新居落成通电试灯时,会造成线路短路或接地故障。遇到阴雨天,还会发生墙地 Some rural houses built in some areas have not been formally designed. When the lighting lines are concealed, in order to save money, the necessary hard plastic tubes and other insulating materials are often omitted, and the wires are directly plugged into the wall joints, or the wires are used to hold the wires. Nailed to the wall and the ground. When the interior wall is plastered or ground, the wire is repeatedly subjected to mechanical impact, friction, and chemical attack by lime, mortar, etc., and the insulating layer is easily damaged. If the conductors are damaged, when the new home is completed and the electricity test lamp is completed, it will cause a short circuit or ground fault. In the rainy days, there will be wall