The above standard came into effect on the 30th April 2019 and supersedes BS 5839-6:2013 which is now withdrawn. This is a full revision of the standard and there are a number of changes in the way that fire detection and alarm systems are designed, installed, commissioned and maintained. These are detailed in NSI Technical Bulletin 0047 attached, which is also available from the approved company login area of the NSI website. Hard copies of the new BS may be purchased from NSI or BSI. The cost from NSI is £231 + VAT per copy (plus £4.95 carriage). You can gain access to the new BS via the online subscription to Standards on the NSI website, which is renewable annually. Whilst the online subscription does provide a low cost access to standards, there are restrictions including one that prohibits printing. For further information on obtaining Standards, please visit our web site or telephone NSI’s Maidenhead office on 01628 637512. Please do not hesitate to contact me if have any queries regarding BS 5839-6:2019 that are not covered in the Technical Bulletin.