In today's world, we all need electricity, and we expect it to be convenient and in top-notch working order all the time. But that isn't always the case. In addition, we might want to make changes to our homes or businesses that will affect electrical installations, or we might have a new building that needs to get lights, plug points and all the wiring that goes with it. Of course, there are also failures, and when it's our homes that are affected, it invariably seems to happen just when we need electricity most.