Very often, electricians during the installation of their own select appropriate cables, and so on, and the role of the customer is limited to the financing of the project.This is due to the fact that the electrician with extensive experience certainly much better than the person selects the equipment which has no idea about electrical engineering.
Electric shock is the physiological reaction or injury caused by electric current passing through the (human) body.
It occurs upon contact of a (human) body part with any source of electricity that causes a sufficient current through the skin, muscles, or hair. Very small currents can be imperceptible.Larger current passing through the body may make it impossible for a shock victim to let go of an energized object.
Master electricians go through extensive on-site and classroom training, with work in more formal settings such as schools or colleges.The designation "master" is only given to electricians who can display extensive job knowledge and are tested to have an extensive understanding of the electrical safety code. There are no formal certifications of the "theatrical title, master electrician", as there are in some of the more mainstream trades, but in March 2003 ESTA, which merged with PLASA in 2010, developed a certification process. Those who pass this rigorous test will become ETCP Certified Entertainment Electricians - and will be recognized as the industry's best.
The stagehands union, IATSE, come close in that they offer apprentice and journeyman levels of certification.