Section 7(4)(iii) in Tamil Nadu Electricity Grid Code, 2005
(iii)Each distribution licensee shall make arrangements that will enable manual demand disconnection to take place, as instructed by the SLDC /SSLDC, under normal and / or contingent conditions. The measures taken to reduce the entities' drawal from the Grid shall not be withdrawn as long as the frequency / voltage remains at a low level, unless specifically permitted by the SLDC / SSLDC.