Are you a Spark or just a DIY chancer that hasn't got a clue?!
13A is more than capable of killing someone, even current as low as 100mA is capable of that in the right circumstances which is why most houses have a 30mA RCD fitted at the CCU to try to prevent those situations from occurring.
The IEE Wiring Regulations aren't just for printed for the sake of it.
Formally a Time Served Electrician now a Electrical Design Engineer by the way.