8/15/2023 0 Comments Line and neutral colors![]() ![]() 158, which is ‘Marking and arrangement of switchgear busbars, main connections and small wiring’.Ĭan you imagine how controversial the arguably major changes implemented in the 8 th Edition would have been? A note stated that the colours adopted for switchboard connections were different from those specified in Regulation 85 for cables and Regulation 63 N referred to British Standard Specification No. The ‘recommendation’ for identifying cables by colour became a requirement, Regulation 85 stated ‘ where colours are used to distinguish the conductors the following shall be employed’. The 8 th Edition of the IEE Wiring Regulations was entitled ‘Regulations for the Electrical Equipment of Buildings’ and was issued in 1924. It may be a surprise for some to see that green was used to identify the neutral conductor. Note that DC was previously referred to as ‘continuous current’, as shown in Figure 1.įigure 1: Regulation 51 from IEE Wiring Rules 7th Edition 1916Ĭolour identification of conductors was first introduced in 1916 in the 7 th Edition of the IEE Wiring Rules and Regulation 51 made recommendations for identifying conductors by colour, as identified in Figure 1.īack then, the phases were referred to by the letters (a), (b), and (c), and the colours recommended were red, white (or yellow) and blue respectively. ![]() This article looks at the changes over the years, and for simplicity looks at the requirements for AC conductors only.
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