Several years ago, the code was updated and it requires us to install arc fault breakers in the house wherever there are new lines being installed except for where GFCI devices are required (kitchens and bathrooms, etc.). This is a major breakthrough in our industry. This is one of the most intelligent breakers. They monitor the current and discriminate between normal and unwanted arcing conditions. Arc fault breakers are primarily designed to protect against electrical fires caused by arcing.