Websites specific electricians also contain different advice, but here they concern primarily the need to call an electrician.It may turn out that insufficiently tightened the fuse will make that we will be deprived of light, and for such a trifle is not worth it to call professional help.
Special computer programs enable electricians much easier to plan where and how they will run the wire, where will be located branch and so on.In this way, more and more electricians may remind us of specialists, because the design of electrical networks at the present time is done properly only through the computer.
The electric code makes a distinction between "high" voltages (100 volts and higher), and "low" voltages below that, and which have two different safety classifications and regulations.
This is generally true for 12 volt systems, but becomes more ambiguous as the voltage increases to 100. The meaning also varies when alternating current is used, as there is the more commonly known root mean square voltage (120v) but also a peak wave voltage (170v).Telephones for example use low voltage cabling, but the ringing voltage from the central office is approximately 90 volts peak AC, and which has an RMS voltage of 63v. In more recent terms, the upper cutoff for what is considered low is approximately 50 volts, with most computer network equipment operating at 48 volts DC or lower, and not requiring special training to connect or use. Although low voltage cabling does not require inspection or training to install in some jurisdictions, it is still important for installers to be aware of specific electric code safety rules such as how to correctly penetrate building fire barriers and use firestop putty (intumescents) to prevent a low voltage cable from reducing building fire protection and increasing the risk of injury or death for building occupants. Access to such safety information is typically restricted and limited access by the electrical industry itself so as to only permit licensed professionals to learn the NEC rules and educate themselves.Źródło: https://en.wikipedia.org/wiki/National_Electrical_Code.