The purpose of a single-line diagram is to give a simplified presentation of the electrical installation on paper. In particular, all electrical equipment and components that are connected to the 230V network must be put on the single-line diagram. Components that operate on a very low safety voltage, such as the integrated home system pushbuttons, do not have to be drawn on the single-line diagram. There would be no point. The “all off” button would then have to be connected to all consumers, which would make our drawing cluttered. In general terms, the single-line diagram of an integrated home system is similar to one for a traditional installation. Nevertheless there are some differences that we will look at here.
Figure 27: Example of a part of a single-line diagram.