BS 7671:2008+A1:2011 is the 17th edition of the outline of requirements
for electrical installations and IET Wiring Regulations. It incorporates
the 2011 amendment.
The document “outlines IET wiring regulations and how to
maintain technical standards in line with the European Committee for
Electrotechnical Standardization (CENELEC). The guidelines cover all
aspects of designing and installing electrical wiring and temporary or
permanent power systems in buildings. It also covers safety engineering,
ensuring you meet regulatory standards... [It] is applicable to all organizations in any industry”.
The British Standards are covered by copyright and are not available freely. However, these can be purchased at British Standard Online or alternatively, some libraries may carry copies of the more common standards.