In this article, we will consider one of the main stages of connecting an electric water heater – connecting to the electrical network .
After you have decided on the place of installation of the electric water heater (boiler), it is necessary to analyze the possibility of its connection to the electrical network . If the water heater has already been used up to this point, then there are no problems with the connection. In this case, it is enough to make sure that the power of the water heater being connected does not exceed the maximum permissible for the wiring line to which the water heater is planned to be connected. This is especially relevant for the instantaneous water heater, which is characterized by high power consumption.
It will be most expedient to carry out the diagnostics of the electrical wiring by a relevant specialist who will inspect the electrical wiring, make the necessary electrical measurements and give a conclusion about the condition of the electrical wiring of the apartment.
If the diagnostics of the electrical wiring showed that this line cannot be used to connect an electric water heater, then it must be replaced. In that case, if the other wiring lines are also in an unsatisfactory condition, a complete replacement of the wiring should be carried out to avoid negative consequences in the near future. This is a separate topic, but now we will consider the features of laying a new wiring line for connecting a water heater .
Laying the wiring line for connecting the water heater
The first thing you should pay attention to is the presence of a protective grounding conductor in the wiring diagram of the apartment. The presence of grounding is one of the necessary measures of human safety against electric shock, which is especially relevant for an electric water heater.
Connecting a storage water heater using a programmable timer
If there is no protective grounding, then a person will be electrocuted in the event of a phase failure on the body of the thermal electric heater (Tena). In this case, it is necessary to ensure the grounding of electrical wiring in accordance with PUE. The presence of a protective disconnection device in the electrical switchboard is another measure aimed at protecting a person from electric shock as a result of insulation breakdown. So, if your shield does not have these protective devices, you need to install them. If it is necessary to install additional protective devices in the electrical panel, it is necessary to have a larger number of free modular places. Therefore, in the absence of the necessary number of them, there is a need to install a new electrical switchboard. When calculating the required number of modular places for protective wiring devices, take into account the devices for the wiring line that feeds the water heater, since it is recommended to install a separate circuit breaker and protective disconnection device for it. It should be mentioned such a protective device as a diff machine. This device, in fact, is combined and performs both the functions of an automatic switch and a protective disconnection device. The use of these protective devices in the wiring diagram allows you to save space in the electrical switchboard. That is, when using diff machines, the size of the distribution board will be much smaller than when using machines and PZV. It is also possible that in this case there will be no need to install a new switchboard. since it is recommended to install a separate automatic switch and protective disconnection device for it. It should be mentioned such a protective device as a diff machine. This device, in fact, is combined and performs both the functions of an automatic switch and a protective disconnection device. The use of these protective devices in the wiring diagram allows you to save space in the electrical switchboard. That is, when using diff machines, the size of the distribution board will be much smaller than when using machines and PZV. It is also possible that in this case there will be no need to install a new switchboard. since it is recommended to install a separate automatic switch and protective disconnection device for it. It should be mentioned such a protective device as a diff machine. This device, in fact, is combined and performs both the functions of an automatic switch and a protective disconnection device. The use of these protective devices in the wiring diagram allows you to save space in the electrical switchboard. That is, when using diff machines, the size of the distribution board will be much smaller than when using machines and PZV. It is also possible that in this case there will be no need to install a new switchboard. The use of these protective devices in the wiring diagram allows you to save space in the electrical switchboard. That is, when using diff machines, the size of the distribution board will be much smaller than when using machines and PZV. It is also possible that in this case there will be no need to install a new switchboard. The use of these protective devices in the wiring diagram allows you to save space in the electrical switchboard. That is, when using diff machines, the size of the distribution board will be much smaller than when using machines and PZV. It is also possible that in this case there will be no need to install a new switchboard.
Instantaneous water heater
It is also necessary to determine the method of connecting the electric water heater to the network . You can use a plug socket for this purpose. That is, to connect the water heaters sacramento to the network, it will be necessary to insert the plug into the outlet. In this case, it is necessary to use a protective outlet designed for installation in rooms with a high level of humidity. As a rule, these are sockets with a degree of protection of the housing IP44. An alternative method is to install an additional shield for the automatic circuit breaker, designed to supply voltage to the electric water heater, as well as to protect against overload currents and short circuits. The switchboard for the water heater will be powered from the main switchboard, in which only the PZV for this wiring line will be installed.
It is also possible to install it in an additional shield of the diff machine. In this case, modular devices are not installed in the main switchboard, it is enough only to separate the conductors from the input cable. The next stage is the marking of the route for laying a new electrical wiring line. When marking, pay special attention to the places where other wiring lines are laid, as there is a high probability that when cutting a new wire, damage to another wiring line is possible.
Next, the slot is cut. This work can be done in several ways. The most optimal option is to use a perforator or a hand tool, since it is not advisable to purchase a hole cutter for one-time work.
For laying the wiring line, it is recommended to use a cable with copper cores, for example, a VVG (ng) cable of the required cross-section. As a rule, the power consumption of a storage electric water heater is 1000-2000 W. Therefore, the cable VVHng-3×1.5 mm 2 is suitable for its power supply . The power of an average instantaneous water heater is 5-7 kW, so the cross section of the above cable is not suitable for its power supply. In this case, it is necessary to choose a cable with a cross-section of 2.5-4 mm 2 .
The selection of protective devices is made in accordance with the rated current of the water heater. The value of the load current of this household appliance is determined by its nominal power. Then the protective device of the closest nominal value in terms of current is selected. It is also necessary to take into account such a parameter of the selection of the protective disconnection device (disconnector), as the differential tripping current. In this case, to ensure the maximum protection of a person from electric shock, it is recommended to use protective devices with an activation threshold of no more than 10 mA.
