1. If there is a ground wire in the original circuit of the place where the device is a thermal electric water heater, it shall be directly connected to the ground wire;. (at the side of the three lines of the power line, the double color line is generally the ground wire.
2. If there is no ground wire in the original circuit in the place where the electric water heater is installed. But the water pipe is a metal pipe, so the ground wire is connected with the metal water pipe;
3. If there is no ground wire in the original circuit of the electric water heater, and the water pipe is not a metal water pipe, the long expansion screw (length: more than 10cm) should be directly driven into the wet place to connect the leads.
4. A 10 cm long expansion screw can be inserted into the back wall of the water heater to connect the ground wire, which can play a certain grounding effect.
Source: Jiangmen magnetic energy water heater http://www.konryt.com/
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