The 17th edition, released in January 2008, is the latest edition of BS7671, and became effective for all installations designed after 1 July 2008. One of the more significant changes is (chapter 41) that 30 mA RCD’s will be required for socket outlets that are for use by ordinary persons and are intended for general use. This improves the level of protection against electrical shock in the UK to a level comparable to that in other EU countries. The 17th edition incorporates new sections relating to microgeneration and solar photovoltaic systems.