Electrical Wiring Colours - The Old and the New (UK) | EC4U New vs Old Wiring Colours. In 2006, Amendment 2 of 17 th Edition BS7671 Wiring Regulations saw a change to “harmonise” the UK colours with the European cable colours for consistency and to avoid confusion. It’s important that properties get their wiring checked, to see if the wiring colours are out of date, have deteriorated over time, and to check if they comply with BS 7671 Wiring Is My Old Electrical House Wiring Safe? - The Spruce The oldest type of wiring system found in homes is called knob-and-tube, named for the insulating knobs and tubes are used to run the wiring along and through the house framing-and-tube wiring was run as individual wires—one black hot wire and one white neutral wire—throughout the home. The insulators keep the wires from touching each other and the wood other combustible materials. Installing Electrical Wiring in an Old Home - YouTube Mar 24, 2015Bob meets up with electrician Barry Driscoll, who is wiring a third-floor subpanel. An electrical inspector reviews it for adequate size and proper location.