most peopleget an electri shock due to their carelessness.the main thing is do not over power your plug by using a multi purpose plug. then do not i stress again do not touch the plug when your hands...
Grounding may be an issue. Have you replaced any coper pipe with plastic, polly or PEX pipe of any kind? if so you will need to add a bonding jumper at the beginning to the end...
Other than upset your heart beat and kill you the reaction of your muscles being shocked can cause a violent, uncontrollable physical movement and you may cause damage to nearby objects and physical...