Uganda, Sept. 23 -- Immediately Juma Kanyike got the resources, he did not hesitate to embark on building a house. Entering his three-bedroom house last year was a huge relief having rented in Kibuli slums while studying at university and a few years into his working life.

Kanyike was specific on his tastes. "I only used double sockets," he told us. But seeking the comfort of accessing power in almost every spot of the house, Kanyike ended up installing many more sockets than he needed. "It wasn't worth it," he realises, just a year after wiring his house.

Yet many others need to overhaul their wiring systems to fix even bigger errors due to wrong choices, quack engineers or outdated technology.

First things first

Lawrence Ssemakula, a ...