The harmonised standard for Fire Protection, ISO 9094, was updated in 2017 and combined 2 parts into 1. It also introduced a new section on fire detectors. The industry has, unfortunately, found the wording of this new section very difficult to interpret and the Notified Bodies have held long discussions at the RSG group to establish a common guideline. In this article, we explain the guidelines which will soon be published so that you can workout exactly how many detectors are required and where they should be located.