Paragraph 1.4 asks for all new flats to be provided with smoke alarms in accordance with the BS 5839-6:2004 to at least a Grade D category LD3 standard. However Table 1 of the BS recommends Grade D Category LD2.
For the purposes of Part B of the Building Regulations, an LD3 system is considered to be adequate. The system itself should, therefore, be installed in accordance with the guidance for LD3 systems in BS 5839- 6: 2004.
Category: Part B - Fire Safety