Section 30(10) in Tamil Nadu Electricity Regulatory Commission Tamil Nadu Electricity Distribution Code
(10)If the connected load of any installation exceeds 15 amperes at 240 volts the installation shall be wired on the group system, separate neutral wires being brought back in each case to the point of supply. Each circuit shall have a distinct control switch. The lamps, fans and other equipments in the installations shall be so grouped that under normal conditions the current will be balanced and no current will flow in the neutral wire.
