You flip the light switch and the lights come on. You turn on the TV and it starts to glow. You open the refrigerator and get a blast of cold air. Surely this must mean that the electrical wiring inside your home is up to date and working perfectly; right? Not necessarily. If your house is 40 years+ you may have to look at upgrading the electrical wiring – especially if you’re looking to sell or rent out. Old porcelain fuses are out, RCDs are…