Otis Singleton
If you're travelling to the United States, you'll need to know the electrical standards to keep your devices running smoothly. The standard voltage in the US is 110-120V, with a frequency of 60Hz, which is lower than the voltage levels typically used in the UK and many other countries. This means you'll need a voltage converter for your devices, as well as a power plug adapter to fit the US's type A and B sockets.
| Characteristics | Values |
|---|---|
| Name | National Electrical Code (NEC) |
| Other Names | NESC, NFPA 70 |
| Standards Organization | National Fire Protection Association (NFPA) |
| Standards Body | American National Standards Institute (ANSI) |
| Frequency of Updates | Every 3 years |
| Standards for | Safe installation of electrical wiring and equipment |
| Standards Applicable to | Overhead lines, underground lines, power substations, and hazardous locations |
| Standards Compliance | Mandated by state or local law |
| Standards Compliance Inspection | "Authority having jurisdiction" |
| Number of Code Panels | 20 |
| Number of Technical Correlating Committees | 1 |
| Year First Published | 1897 |
| Year of Latest Edition | 2023 |
| Number of Pages | 1000 |
| Availability | Bound book, electronic form, digitized coding model |
| Related Standards | OSHA standards and documents related to electrical hazards |
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Voltage converters
In the US, the standard voltage is 110-120 volts, whereas some countries use 220-240 volts. If you're travelling to the US with electrical appliances from a country with a voltage of 220-240 volts, you will need a voltage converter.
Converters are available to purchase online and in stores. When buying a converter, always read the instructions and pay close attention to the power details. Consult the product manual for your item and cross-check with the voltage standards found in your destination country. You should also check whether your device has dual voltage, meaning it can handle voltages from all over the world.
Some examples of voltage converters include:
- Bestek Travel Adapter and Voltage Converter: This product has three AC outlets and four USB ports, allowing you to charge up to seven devices at once. It comes with three plug adapters that work in over 150 countries.
- Epicka Adapter: This adapter has four USB-A ports, one USB-C port, and one AC socket. It can be used in 150 countries and charges six devices simultaneously. However, it is not a voltage converter, so it should not be used for devices like curling irons or hair dryers.
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Plug types
The electrical standard in the USA is a voltage of 110-120V at a frequency of 60Hz. The power sockets are of type A and B, with plugs featuring two or three prongs. One vertical prong is electrically "hot", while the other is "neutral".
Plug Type A
This plug type has two flat parallel pins. It is commonly used in the USA and across North and Central America. It is also found in parts of Japan, and some Chinese appliances use a similar plug with an additional grounding pin. Type A plugs are generally considered to be polarised, meaning that the larger slot is a neutral wire, while the smaller slot is the live wire.
Plug Type B
This type of plug also has two flat parallel pins but includes an additional grounding or earth pin. Similar to Type A, it is commonly used in the USA and across North and Central America. It can also be found in some parts of Japan and the Middle East. Type B plugs are also polarised.
Voltage Converters and Travel Adapters
The voltage and frequency in the USA differ from those in many other countries, so it is important to use a voltage converter when using electrical devices from other countries. Some devices may not require a converter if their label states 'INPUT: 100-240V, 50/60 Hz', as they can be used across a range of voltages and frequencies. However, a power plug travel adapter is still necessary for visitors from countries such as the UK, as the plugs in the USA are different.
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Frequency
The electrical standard in the USA is a frequency of 60 Hz and a voltage of 110-120V. This is different from many other countries, where the standard is 220-240V at 50 Hz. The discrepancy arose because electrical standards were originally established by individual countries, without international standardization.
The National Electrical Code (NEC), or NFPA 70, is a United States standard for the safe installation of electrical wiring and equipment. It is not a US law, but its use is commonly mandated by state or local law, as well as in jurisdictions outside of the US. The NEC is revised by the National Fire Protection Association's Committee on the National Electrical Code every three years, to ensure that the code incorporates the latest technology and safety measures. The NEC is a comprehensive document, at around 1000 pages, and is available as a bound book or in electronic form.
The NEC is approved as an American national standard by the American National Standards Institute (ANSI). It is formally identified as ANSI/NFPA 70 and was first published in 1897. The NEC is updated and published every three years, with the 2023 edition being the most current. Most states adopt the most recent edition within a few years of its publication, but some do not immediately do so.
The NEC is also available as a restricted, digitized coding model that can be read online on certain platforms that support the restricted viewer software. However, this digital version cannot be saved, copied, or printed. 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.
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Power grids
The "grid", or transmission system, is an interconnected group of power lines and associated equipment that moves electric energy at high voltage between points of supply and delivery. The US electric grid is a network of several hundred thousand miles of power lines that connect thousands of electric generators to power households and businesses across the contiguous United States.
The electrical power grid that powers North America is divided into multiple wide-area synchronous grids. The Eastern Interconnection and the Western Interconnection are the two major alternating-current (AC) electrical grids in North America. The Eastern Interconnection covers the area from Saskatchewan eastward to the Atlantic coast, excluding Quebec, and stretches south to Florida and back west to the foot of the Rockies, excluding most of Texas. The Western Interconnection stretches from Western Canada south to Baja California in Mexico, reaching eastward over the Rockies to the Great Plains. The USA part has 250 GW of generating capacity.
There are three other regions with their own power grids: the Texas Interconnection, the Quebec Interconnection, and the Alaska Interconnection. These grids are not usually directly connected or synchronized with each other, but there are some high-voltage direct current (HVDC) interconnectors. The Eastern and Western grids are connected via seven links that allow 1.32 GW of electricity to flow between them.
Within each region, there are interconnected local electricity grids. This redundancy ensures that there is minimal loss of service in the case of local failures. The North American Electric Reliability Corporation (NERC) oversees six regional reliability entities and encompasses all the interconnected power systems of Canada and the contiguous United States, as well as a portion of Mexico. NERC's responsibilities include developing standards for power system operation, monitoring and enforcing compliance with those standards, and providing educational resources.
The US power grid is highly fragmented, consisting of three different sections: the Eastern, Western, and ERCOT interconnections. These are three separate power grids that are almost completely isolated from one another electrically. The lack of a unified plan for the US power grid has led to concerns about its ability to handle extreme weather events and coordinate responses effectively.
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Electrical standards enforcement
In the United States, the National Electrical Code (NEC) is the de facto standard set of electrical requirements. The NEC is composed of an introduction, nine chapters, annexes A through J, and an index. The introduction outlines the purpose, scope, enforcement, and general rules/information. The first four chapters cover definitions and rules for installations, circuits and circuit protection, and methods and materials for wiring.
The NEC is enforced by licensed electricians who have spent years of apprenticeship studying and practicing the NEC requirements prior to obtaining their license. Failure to adhere to well-known best practices for safety can result in civil liability lawsuits. This liability has motivated cities to adopt and enforce building codes that specify standards and practices for electrical systems, creating a system whereby a city can best avoid lawsuits by adopting a single standard set of building code laws.
The National Fire Protection Association (NFPA) publishes a comprehensive NEC Handbook that contains the entire code, along with illustrations, explanations, and cross-references. Many NEC requirements refer to "listed" or "labeled" devices and appliances, indicating that they have been designed, manufactured, tested, inspected, and marked in accordance with the requirements of a listing agency. These listing agencies are "nationally recognized testing laboratories" (NRTL) approved by the U.S. Department of Labor's Occupational Safety and Health Administration (OSHA).
The NEC also includes guidance on interpreting selected articles of NFPA 70, addressing unique situations that arise during deactivation and decommissioning (D&D) activities at U.S. Department of Energy (DOE) facilities. This guidance provides clarification on the electrical code and related standards for hazardous locations, such as explosive atmospheres.
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Frequently asked questions
The National Electrical Code (NEC) is the United States standard for the safe installation of electrical wiring and equipment. It is not US law, but its use is commonly mandated by state or local law, as well as in jurisdictions outside of the US.
The NEC codifies the minimum requirements for safe electrical installations into a single, standardized source. It is part of the National Fire Codes series published by the National Fire Protection Association (NFPA).
The NEC is revised by the NFPA's Committee on the National Electrical Code, which consists of 19-20 code-making panels and a technical correlating committee. It is revised every three years to ensure it takes into account the latest in technology and safety.
