There are significant benefits in using standardised and prefabricated electrical and electronic wiring systems in buildings. Part 1 of this Information Paper focuses on the whole-life benefits of such systems, and ways of overcoming barriers to their more widespread use. Part 2 describes a number of case studies which highlight the savings that can be achieved. The case studies cover: power distribution to luminaires, air conditioning units and socket outlets; control of lighting, air conditioning and heating; category 5 and category 6 structured IT networks. Included are two examples of innovative infrared control systems. (8 pages per part.)