House hold electric circuit The pictorial representation of household electric circuit is given in the below diagram. Tree system Generally, for the household connection two lines are taken from the distribution system as shown in the diagram. Starting from the left hand side of the diagram, one red and one black line connection is provided to a house, red line represent live line or phase line and the black line represent neutral line. Initially they are connected to watt hour meter which is used to measure the current used in that particular house for billing purposes. From there earthing should be done, which is shown in the diagram in green colour. Colour code of household electric wires and potentials difference between them As we mentioned above there are three lines in household electrical circuit- live line(phase line), neutral and earth line. For live which is also known as phase line we have to use red coloured wire. For neutral line, black wire is used. And ...