Police had gone to the house of driver Gopal to investigate about a clash between two groups belonging to Kamankottai and Mennandhi villages over an eve teasing incident.
They had allegedly pulled Gopal's wife, besides forcibly taking him to the police station for questioning.
Subsequently, cases were registered against seven persons and police were looking for one Parathasarathy related to Gopal, police said.
Locals doused the fire and rushed him to the government hospital at Ramanathapuram where his condition is critical.
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Following a complaint by Gopal's brother Jayraj, cases were registered against Inspector Raja, and police personnel Rajivgandhi, Satheesh, Rajesh Kanna and Krishnavelu for instigating Gopal to attempt suicide, police said.
The Superintendent of Police, Ramanathapuram district, Manivannan today ordered registration of cases against them.
Manivannan said further action against the personnel would be taken after receiving the departmental inquiry report.