Besides BS EN 12845 Sprinkler Rules the other most commonly used commercial sprinkler design rules used in the UK are NFPA (13 and 20) + F. M. Global Data Sheets. Many American companies who have sites in the UK may have American insurers and they tend to lean towards using NFPA Rules. Probably because they are more familiar with NFPA rules and less familiar with the UK/ European rules. These American standards, though not the most commonly used, are nevertheless familiar to, and used by, sprinkler designers. NFPA are a proven and reliable set of standards for sprinkler systems.
