- Reaction score
- 13,478
I believe the point is to specify the general configuration and function of a distribution board-based system rather than to define how many cables comprise each circuit. For example, it prohibits the 'tree system' where one main cable runs through every room in the house, with a fuseholder in each room tapping off that room's supply. This was popular in the early days of wiring. It also prohibits final circuits being paralleled up with distribution circuits and other random topologies.