Typically, you wire 4-core cables for applications such as 2-way circuits. For example, you could wire this type of circuit to control an application running to the same location – a fan or set of lights controlled from two points.
Whether you use 4 core flexible cable or single-strand hard cable, the wiring must conform to the applicable colour codes:
In most cases, when wiring 4 core electrical cable to residence, only a single phase is brought into the home from the mains distribution source.
Under the revised British standard for electrical cables, 4 core cable colours have changed. The old colours for the four cores in a 4 core cable were Red, Yellow, Blue and Black. These are now replaced to Brown, Black, Grey and Blue. In the new regulations, Blue (not black!) is neutral. Brown is the hot (live) wire. This specification of 4 core cable colours must be kept in mind when wiring an application using four core wire.
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