When installing the grounding wire, can not use the water pipe as the grounding wire, if it is the bathroom, should be used equipotential coupling, or grounding system should be consistent with the power system.
1, can not use the water pipe as a grounding line here is a wrong practice, and this practice usually occurs in part of the old neighborhood.
2, the bathroom should be used in equipotential bonding people in their daily lives in there is a misunderstanding, that is, in the safe voltage, people will not be electrocuted. Bathroom environment is humid, even if the person touches the safety voltage below 50V, there is a possibility of electric shock.3, grounding system should be consistent with the power system before the electrical design, you must first understand the residential power supply from where, as well as the power supply grounding system. Grounding protection measures should be consistent with the power system. Grounding system is divided into TT system, TN (TN-C, TN-S, TN-C-S) system, IT system.