Police said Manish, a resident of Uttam Nagar, came in contact with the wire on the moving truck following which the vehicle also caught fire.
The incident took place at around 12.30 pm near the DAV public school in Vikashpuri.
A spark erupted after Manish came in contact with the wire following which the truck also caught fire, said police.
Manish was taken to Deen Dayal Upadhyaya hospital with 80 percent burn injuries and his condition is stated to be critical, police said.
