Section 7(3)(iv) in Tamil Nadu Electricity Grid Code, 2005
(iv)Any tripping, whether manual or automatic, of any of the above elements of State Grid shall be precisely intimated by the concerned entities to SLDC as soon as possible, say within ten minutes of the event. The reason (to the extent determined) and the likely time of restoration shall also be intimated. All reasonable attempts shall be made for the elements' restoration as soon as possible.