An electrician's license entitles the holder to carry out all types of electrical installation work in Australia without supervision.
In Western Australia the Department of Commerce tracks licensee's and allows the public to search for individually named/licensed Electricians.Źródło: https://en.wikipedia.org/wiki/Electrician
Excellent insulation of cables and their arrangement can make the most electrical work will be the installation of such electrical lines, not during their operation.Does this mean that in the future, avoid any electrical failures? The answer to this question is simple and of course negative, because although more and better solutions are continuously implemented many failures simply impossible to predict, even using the most modern electrical installations.
The movement of electric charge is known as an electric current, the intensity of which is usually measured in amperes.Current can consist of any moving charged particles; most commonly these are electrons, but any charge in motion constitutes a current. By historical convention, a positive current is defined as having the same direction of flow as any positive charge it contains, or to flow from the most positive part of a circuit to the most negative part.
However, depending on the conditions, an electric current can consist of a flow of charged particles in either direction, or even in both directions at once.The positive-to-negative convention is widely used to simplify this situation.Źródło: https://en.wikipedia.org/wiki/Electricity.