【单选题】【消耗次数：1】
景观照明灯具金属构架及金属保护管应分别与保护导体采用焊接或螺栓连接，连接处应设置（ ）。
①
警示标志
②
标识
③
接地标识
参考答案：
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【多选题】
金属导管应与保护导体可靠连接，下列说法正确的有（ ）。
①
镀锌导管类别间不得熔焊连接，连接处的两端宜采用专用接地卡固定保护联结导体
②
非镀锌导管连接处的两端应熔焊连接
③
采用机械连接时，当导管的连接处的接触电阻值符合相关要求，可不设置保护联结导体
④
机械连接仅可采用紧定式和扣压式
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