SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Electrical cable. Cutaway end of a three-core and earth electrical cable. This cable has three insulated copper conductors and a bare solid copper earth wire. This type of cable is used in lighting circuits where a light can be turned on or off at either of two switches. These colours (brown is L1, black is L2, and grey is L3) must be used in new wiring in the UK from April 2006, under regulations that require the same colours to be used all over Europe. The changeover started in April 2004. For the old colours, see T194/602.
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