Radial Circuit | Wiring a Radial Circuit | Electrical Electrical Radial Circuit Wiring Including the Size of Cable and MCB That Should be Used A radial circuit is a linear mains power circuit found in all homes.. If you have ever done any basic electrics,.. The Importance of the Correct Size Cable and..DIY Projects · DIY Videos · Find Tradesmen · Wiring a Wall Light Radial circuit light wiring diagram | Light wiring Multi-point radial lighting circuit (new cable colours) This live feed now loops back out of the rose (cable B, Fig 2) and feeds power to the next ceiling light in the radial circuit (Ceiling rose B, Fig 1). This repeats for each light in the circuit until we reach the last light. Once we reach the last light,..