All people who lead electrical careers or offer any kind of electrical service must adhere to the National Electrical Code (NEC). NEC is accepted in all 50 states to ensure electrical safety and protect people from any hazards.
The National Electrical Code emphasizes on proper installation of electrical systems, equipment, raceways and optical fiber cables, among others. The standards are usually included in the law by local jurisdictions and states. However, this may result in different practices in different parts of the country. Relevant materials on the National Electrical Code can be found on reputable sites, such as NEMA and NFPA.