Partially Verified65% confidenceDecision RuleTime unknown

选购前必须确认墙内是否有零线：老房子多为单火线布线，只有火线进开关盒。零火版智能开关需要零线供电，稳定性远高于单火版；单火版靠微弱漏电取电，接LED灯时易频闪、鬼火、无法关断

3

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65%

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Long-term

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Unverified老房子改造前先确认开关底盒是否有零线，2016年后国标要求预留零线，老房通常只有火线（单火），此时应选单火版智能开关，否则无法通电工作87% similar Unverified接线式温控器需确认供电方式：单火线(2线)温控器无零线容易造成灯光频闪或无法带屏，有零线(3线)更稳定，老房子多为单火线，改造前先确认底盒有无零线84% similar

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