Can't electric water heater be installed in old house?
Water heater recommended safety first, some old houses do not have ground wire, it is recommended to install earth wire and leakage protector or air switch.Pay attention to the electricity environment:1. home power standard.In accordance with national standards, the power supply of household electric equipment shall be single-phase, three wire, 50 Hz, 220 volts alternating current. The three lines of the power supply - the fire line, zero line and ground wire are correctly connected and in accordance with the external mark. The grounding is good, the insulation protection is in good condition, and the wire diameter thickness meets the capacity load requirement. In the national power quality, the allowable voltage of the supply voltage is -10% to 7%, which is between 198 volts and 235 volts according to the standard voltage of 220 volts. For electric water heater products, the deviation is extended from -15% to 10%, or between 187 volts and 242 volts. In areas where the electricity load is relatively concentrated, the expansion should be done appropriately.
Power outlet and extension line.The electrical outlet needed for the appliance should be configured as required. According to the national standard requirements, single-phase three wire (socket) socket, the left end of the socket is N pole, zero line; the right end is L pole, phase (fire) line; the upper end of the ground sign should be the end of the ground wire, not interchangeable. The socket shall be in accordance with the plug of the electric water heater. It is better to use 16 amperes, especially the electric water heater with a rated power consumption of over 2000 Watt hour. The socket is preferably waterproof and has a case protection to prevent water and steam from entering the joint gap between the plug and the socket. Socket as far as possible vertical placement, if installed on walls and other objects, should try to keep away from water or sprinkler head, it is best to bath and bath water, water can not be directly contact. The socket should be easily and securely connected to prevent the electric lead from pulling when it is pulled or touched. When the power leads are long, they should be bundled, adhered and fixed to objects that are not easy to move.
Protection requirements.The total meter load of the household can not exceed the standard. It is better to have an air protection switch, at least a fuse protector such as a safety tube (wire) and a nominal value of the safety tube (wire) shall not exceed the limit value. Water storage type electric water heater shall be provided with a separate power supply line, stop and other high-power appliances (such as water heater, heater, electric heater) share a power line (note the connection from the meter rather than from the socket, the wall cannot connect from the middle), a separate set of leakage, overload and over-current protection device, the protection of the current value of 2 times the level shall not be greater than the rated current of the single electric appliance.
