First, your illustrations are Mad Awesome. You could illustrate electrical books. You might even talk to Mike Holt or others doing electrical docs. Homes typically have several kinds of home wiring, including Electrical wiring for lighting and power distribution, permanently installed and portable appliances.
Although the IEE Wiring Regulations let you have an unlimited number of socket outlets on each main circuit running from your consumer unit, there are restrictions.
It is extremely difficult to find an outlet and coax wall plate for some reason. Wires Single Gang Cable Access Strap Wall Socket Plug Port for HDTV HDMI. In old circuits, sheaths may be rubber. This wiring must be updated by an electrician.