OP
chrisjacob
I have gathered lots of useful information from this thread. I want to share one of my faulting experience. There is a fault in my boss cabin and he called me in the midnight for checking this issue, as I have little knowledge about handling electrical equipments. Actually the problem is that sockets were going on and off and the extension was also very old. When I will try to repair it,suddenly fire occurs and which destroys the whole office.That was horrible experience.But after reading this post, all my doubts are clear.