What's the safest way?
There is no doubt that the addition of safety switches (RCDs) to old switchboards, when used to protect existing rewireable fuses, will improve the safety of the electrical installation in your home. However, the best way to protect yourself and your family is to remove the existing switchboard panel and all the rewireable fuses and replace it with a fully upgraded switchboard panel.
Why upgrade your switchboard?
With so many advances in technology to the appliances we use in our homes, we can’t expect the older switchboard to be able to perform in the same level without similar advancements.