Electrician installing electrical cable. Went home at the end of shift 02/16/08 and on 02/17/08 his back was hurting and went to the clinic where he was given presciption drugs for pain. On 02/18/08 electrician went to his chiropractor where his L-5 disc was realigned. Electrician returned to work on his next scheduled shift 02-20-08 with a full duty release.