The utility model discloses a ground wire live control device for a hot electric water heater. The utility model relates to a live wire electrification control technique for a hot electric water heater. The utility model is characterized in that the zero earth wire potential difference detecting device is indirectly connected with the ground wire and the zero line, and the potential difference detection device is composed of a step-down circuit and a rectification circuit, and is provided with a voltage stabilizing circuit and a voltage dividing circuit. The step-down circuit is a step-down mode of the transformer. An input end of the output signal of the zero earth wire potential difference detecting device and circuit connection, another input amplifier circuit with a reference voltage is connected with the output end of the operational amplifying circuit and relay control coil is connected with the normally closed contact of the relay control wire and fire off line. The utility model relates to an earth wire live control technique, which aims at protecting the personal safety when the grounding wire and the basic insulation of the thermal electric water heater fail at the same time.
【技术实现步骤摘要】
【技术保护点】
一种即热式电热水器防地线带电控制装置，其特征是在地线和零线间接有零地线电位差检测装置。
【技术特征摘要】
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