Part I of the paper describes the wiring systems at present in favour and comments on the qualities of each, with particular reference to suitability for the safe conveyance of electricity in domestic buildings under new supply conditions.It is argued that a metallically continuous, screwed, steel system with metal boxes at all outlets most nearly fulfils ideal requirements, and that attention should be more particularly directed to the development and improvement of this system and its applications. More concentration on one good system should ultimately simplify rules and regulations, and increased production and more uniform practice must lower initial costs and improve the general quality of work.Part 2 treats more of the arrangements and lay-out of wiring in houses of 10 apartments and less, and gives the author's views on the planning of circuits for lighting and power and for combined load. Some suggestions are offered whereby new building structures might be made more suitable to receive electrical installations. A basis for estimating provisional costs, other than a rate per point, is indicated and it is suggested that the inspection of installations might be undertaken by inspectors responsible only to a joint body of control.