The labourers were shifting the 20-feet high ladder inside an underconstruction house when it touched the power line, leaving three of them dead on the spot, Station House Officer of Sujangarh police station, Anil Mund said.
The victims were identified as Saddam, Muslim and Khalid, all aged 25 years, he said.
The injured have been admitted to a local hospital where their condition is stated to be stable, the SHO added.