Neutral Cables are electrically low (near zero) cables and are used as a reference. As we know, to have an electric current flow there must be a potential, if we only use a phase cable to enter an electrical component, such as a lamp, the light will not turn on. If we add a neutral cable there will be a potential difference between the phase and neutral wires that pass through the lamp so that the light is on. The characteristic of this cable is that if it is in the tespen, the tespen does not turn on.