The order, banning agitations, processions, meetings and dharnas, would be in force till October 7, Deputy Superintendent of Police, Neyveli Sub-Division, G Kalaiselvan said.
On September 5, the High Court had passed an interim order on a petition by the public sector company, restraining nine unions from proceeding with the strike till October 7.
Kalaiselvan said permission given for a public meeting by the unions today at Mandarakuppam near Neyveli was also cancelled.
T Srinivasan, JAC Secretary, said the strike would continue if the talks failed.
NLC Public Relations Officer S Sridhar said the strike had not affected power generation at NLC's thermal plants or lignite production.