23739-1

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23739-1, more commonly known as the NEC Electrical Wiring Standard, is a comprehensive electrical wiring and installation guide that sets the standard for electrical installation in the United States. It is an electrical wiring code written in the form of a text-based "instruction" to the installer on how the electrical wiring should be installed. In essence, the purpose of the NEC is to protect homeowners, businesses, and other entities from potential electrical hazards due to improper wiring. In this document, we will dive into the NEC Electrical Wiring Standard to understand the application field and working principle.

The NEC Electrical Wiring Standard is used to regulate the installation of electrical wiring, equipment, and systems in the United States and is also referred to as the National Electrical Code (NEC). The current version of the NEC is the 2020 Edition, which was published in 2021 and is in effect until 2025. Every year, the code is updated to reflect any changes in electrical codes, best practices, and safety requirements.

The primary application field of the NEC Electrical Wiring Standard is commercial and residential wiring. The code applies to any electrical system that involves direct current, alternating current, power generation, telecommunications, signal control, and fire alarm systems. The NEC also governs grounding and bonding, installation of lightning protection systems, protection from electric shock, and the installation of solar panels.

The NEC Electrical Wiring Standard is based on nine different principles. The first is safety. The NEC was designed with safety first and foremost in mind, and the code outlines the safety requirements for both equipment and wiring installation. The second is installation methods. The code specifies how the electrical wiring should be installed safely and correctly. The third principle is protection against the effects of electricity. This includes equipment grounding, overcurrent protection, arc-fault circuit interrupters, and surge protective devices.

The fourth principle is energy efficiency. The code outlines the required efficiency levels for both equipment and wiring installations. The fifth is harmonics. The code specifies limits for electrical impedances in order to prevent the generation of harmonics and other electrical noise. The sixth is coordination of protection devices. This principle outlines the methods for short-circuit protection and proper protective equipment coordination.

The seventh principle is Power Quality. This principle covers topics such as load balancing, voltage fluctuations, harmonic frequency limits, and power quality monitoring. The eighth principle is Special Occupancies. This covers installation requirements for specific types of occupancies such as hospitals, healthcare facilities, and commercial establishments. Finally, the ninth principle is Life Safety. This outlines safety requirements for protection from shock, fire, and other dangers.

The NEC Electrical Wiring Standard is a comprehensive document that specifies the electrical wiring and installation requirements for commercial and residential properties in the United States. It is based on nine principles that cover topics such as safety, installation methods, protection from electric shock, energy efficiency, harmonics, coordination of protection devices, power quality, special occupancies, and life safety. The code is updated annually to reflect any changes in electrical codes, best practices, and safety requirements.

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