LOAD ALTERATION
Many existing electrical installations require one or more additions or alterations during their lifetime. An addition or alteration may be minor such as the addition of a point to a final circuit, or major such as the addition of new final circuits, distribution circuits, or consumer units.
Where an addition or alteration (whether temporary or permanent) is to be made to an installation, the relevant requirements of BS 7671 have to be met such that both the addition or alteration is safe, and the safety of the existing installation is not impaired.