Where does the 380 volts
Air lines between towns, cities and large enterprises are high-voltage high-voltage lines. With this voltage transfer of electricity involves fewer losses. Even taking into account the work of stepdown transformers. At CTU, standing in the settlements with residential houses, blocks of apartment buildings (factories usually entire substations), high voltage is converted to 380 volts.
There are 4 wires, sometimes they used a system of five wires. Three wires – a separate phase. One wire is zero. The voltage between any separate phaseof mi is 380 volts. This line voltage. The voltage between a single phase and neutral wire is 220 volts. This is the phase voltage. Phase never connects, not even touch, otherwise it will short circuit.
What is 380 volts
In the apartment, employing only a TV, a fridge, and occasionally the vacuum cleaner, the load is small, so you can do just two wires: phase and zero. When talking about the house where there is a garage and workshop or a sauna, and a pool where the weight of household appliances, ventilation system or is being heated with electric heaters, it is better to have four wires and provide a linear voltage of 380 volts.
This allows to distribute the load over the phases. For example, a garage and a sauna to "sit" on one phase, the kitchen on the other, everything else third. Phase separation occurs when you install a distribution panel. For power equipment, for example, electric motor, welding machine, electric boiler, electric or splitsistemy, you will have 380 volts on the plate in the house.
How to connect a line of 380 volts
When connecting at home is calculated by the project power consumption. The fact is that when connecting a power supply company allocates a limited amount of power. For example, 3 kW with 220 V and 3 kW 380 V, which are taken from the nearest support. Anything above connects directly with the nearest transformer. The cables from the transformer to your home is usually laid at the customer's expense, that is payable by you.
If you need in the house and 380 In the economy, you have to stretch a line or a cable laid on the ground. Calculation of the cross sections, project and gasket done by specialized firms. You only pay for all the work. This means that you must carefully prepare a list of possible equipment requiring connection to 380 V. This minimizes your costs in the future.