Two-Way Lighting Circuit Wiring | SparkyFacts Two-Way Lighting Circuit Wiring Two way switching is the most common requirement for many household and commercial lighting solutions. Whether it is the switching of a light from two different places inside a domestic dwelling or switching a series of lights in a commercial environment, two-way lighting circuits provide a cost effective and easy solution. two-way-switching-wiring-diagram | Light wiring Old multi-point radial lighting diagram using junction boxes; Two-way switching. 2 way light switch (3 wire system, new harmonised cable colours) 2 way switch (3 wire system, old cable colours) 2 way switch (two wire control) Three way switching. 3 way light switching Wiring a 2-Way Switch - how-to-wire-it This should give you a good basic understanding how the 2-way switch circuit works and will help you in adding or changing a 2-way switch. So now that you have a basic concept of wiring a 2-way switch, let's look at the following 2-way switch diagrams to see which type of circuit scenario you have.