All new electrical work within a domestic setting, in England and Wales, must comply with Part P of the Building Regulations. These were introduced on 1 January 2005 and are legally enforceable.
In 2005 the Building Regulations introduced the new Part L demanding all new boilers installed to be categorised as high efficiency systems. This includes condensing boilers and combination (also known as combi)
Since 1960, the supply voltage in UK domestic premises has been 240 V AC (RMS)