Electric power transmission is the bulk movement of electrical energy from a generating site, such as a power plant, to an electrical substation.
This is distinct from the local wiring between high-voltage substations and customers, which is typically referred to as electric power distribution.
In the United Kingdom, the network is known as the "National Grid". A wide area synchronous grid, also known as an "interconnection" in North America, directly connects a large number of generators delivering AC power with the same relative frequency, to a large number of consumers.
For example, there are four major interconnections in North America (the Western Interconnection, the Eastern Interconnection, the Quebec Interconnection and the Electric Reliability Council of Texas (ERCOT) grid), and one large grid for most of continental Europe.Źródło: https://en.wikipedia.org/wiki/Electric_power_transmission
Then, when the walls have been rebuilt there is a need to distribute the system throughout the house.He then are assembled separately, and all kinds of electrical outlets, of which the inhabitants of the house will later use. Of course, they are responsible for bringing the electrical system to the possibility of exploitation. Often electricians are also involved in installing electrical systems, such as intercom systems, which are quite useful, especially when dealing with a compact architecture..