The rural electrification drive during the New Deal led to a wide expansion in the number of jobs in the electric power industry.Many power linemen during that period traveled around the country following jobs as they became available in tower construction, substation construction, and wire stringing.
This led to an increase in the number of linemen needed to maintain power distribution circuits and provide emergency repairs.Maintenance linemen mostly stayed in one place, although sometimes linemen were called to travel to assist repairs. Also during the 1950s, some electric lines began to be installed in underground tunnels, expanding the scope of the work.Źródło: https://en.wikipedia.org/wiki/Lineman_%28technician%29
Parking systems are designed so that the most common problems that may arise during their lifetime the irregularities in the electricity and then the appropriate repair must address electrician.
The NEC is available as a bound book containing approximately 1000 pages. It has been available in electronic form since the 1993 edition.
Although the code is updated every three years, some jurisdictions do not immediately adopt the new edition. The NEC is also available as a restricted, digitized coding model that can be read online but not saved, copied and pasted, or printed, free of charge on certain computing platforms that support the restricted viewer software. In the United States, statutory law cannot be copyrighted and is freely accessible and copyable by anyone.
When a standards organization develops a new coding model and it is not yet accepted by any jurisdiction as law, it is still the private property of the standards organization and the reader may be restricted from downloading or printing the text for offline viewing.For that privilege, the coding model must still be purchased as either printed media or a CD-ROM.Once the coding model has been accepted as law, it loses copyright protection and may be freely obtained at no cost. Archive.org and many state or local government sites allow download of the NEC without the registration that the NFPA requires. External links to both the restricted NEC online access and free public access sites are referenced at the end of this article.Źródło: https://en.wikipedia.org/wiki/National_Electrical_Code.