We will now lay out the details of UK wiring colours since the IEC rules came into effect. Only the protective earth wire retained its pre-IEC colour, that being green and yellow. The implementation of these new IEC-based rules resulted in the neutral, single phase live and three-phase live wiring colours all being changed. The main reason for these changes was to match UK wire colours with those in Europe in order to achieve harmonisation. Officially, these changes were brought in under British Standard BS 7671. However, these changes did not fully come into effect until March 2006. The UK first adopted the IEC wiring colour standard in 2004. These minor changes helped to reduce confusion and therefore increase safety. The purpose of these changes was primarily safety with wiring colour changes occurring such as the white second phase wire being changed to yellow in 1964. Minor wiring colour changes occurred in the UK shortly after the second world war, in the 1960s and during the 1970s. British wiring colours have seen small changes several times in recent generations although a major overhaul occurred once in the mid-2000s. British wiring colours have changed for reasons of safety and to harmonise UK wire colours with other countries. We will discuss how often the colours of wiring have changed in the UK and the reasons behind these changes. For this section we will look at how wiring colours have evolved over the years.
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