Trystan Casey
Mains electricity is the power that is brought into people's homes. The voltage of mains electricity varies across the world. The mains supply in the UK is an alternating current (AC) with a voltage of 230 volts (V) and a frequency of 50 Hertz (Hz). In the US, the nominal voltage is 120 V, while in Japan, the electrical power supply to households is at 100 and 200 V. Voltages generally range from 100-240 V, and the commonly used frequencies are 50 Hz and 60 Hz.
| Characteristics | Values |
|---|---|
| Voltage range | 100-240 V |
| Commonly used frequencies | 50 Hz and 60 Hz |
| Type of power system | Single-phase or three-phase |
| Voltage in the UK | 230 V |
| Voltage in the US | Nominally 120 V, with a range of 114 V to 126 V |
| Voltage in Japan | 100 V and 200 V |
| Voltage in Canada | Nominally 120 V |
| Voltage in Europe | Historically 220 V, now 230 V |
| Voltage for lighting | 240 V |
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What You'll Learn
Voltage standards vary across countries
Voltage standards for mains electricity do indeed vary across countries. The mains voltage in the UK is 230 V, with a frequency of 50 Hz. In the US, the nominal voltage is 120 V, with a range of 114 V to 126 V, and a frequency of 60 Hz. In Japan, the electrical power supply to households is at 100 and 200 V, with a frequency of 50 Hz in the eastern and northern parts of Honshū, and 60 Hz in the western regions.
In Europe, voltage standards have been historically different in the UK and mainland Western Europe. While the UK used 240 V, mainland Western Europe used 220 V. In 1994, the European Union decided to harmonise the voltage at 230 V, allowing products to be used across the continent with the correct plug adaptor.
Some countries have more than one voltage available. For example, in North America, a unique split-phase system supplies most premises with both 240 V and 120 V. This allows homeowners to wire up circuits according to their needs. Most sockets are connected to 120 V for small appliances, while larger appliances use dedicated 240 V sockets.
The voltages across countries are generally in the range of 100–240 V, with frequencies of either 50 or 60 Hz. Foreign enclaves, such as large industrial plants, may have different standards from the surrounding areas.
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Voltage and frequency in the UK
The mains electricity supply in the UK is an alternating current (AC) with a voltage of 230 volts (V) and a frequency of 50 Hertz (Hz). The voltage in the UK was previously defined as 230 V, +10%/-6% (216.2-253.0 V). However, the standard voltage is now maintained within a narrower range of 230 V +/- 3%.
The UK's electricity supply operates at a higher voltage than countries like the United States and Canada, where the nominal voltage is specified at 120 V, with an allowable range of 114 V to 126 V. Japan also has a different electrical power supply, with voltages of 100 and 200 V in different regions of the country.
The UK's mains electricity is supplied through a three-wire grounded and fused plug system, known as Type G. This system provides a safe and secure connection for electrical appliances, with a live wire (brown), a neutral wire (blue), and an earth wire (green and yellow). The earth wire is a critical safety feature designed to prevent accidents and electrocution.
It's important to note that voltage and frequency can vary slightly within the UK. Some areas, for legacy reasons, still have voltages up to 250 V, which fall within the 10% tolerance band of 230 V. Additionally, voltage spikes above the nominal range can occasionally occur due to local power generation sources, such as solar farms.
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Voltage and frequency in North America
In North America, a unique split-phase system is used to supply electricity to most premises. This system works by centre-tapping a 240-volt transformer, allowing it to concurrently provide 240 volts and 120 volts. This gives homeowners the flexibility to wire up both 240V and 120V circuits as per their requirements and local building codes. Most sockets in North America are connected to 120V, which is used for small appliances and electronic devices. Larger appliances, such as dryers, electric ovens, ranges, and EV chargers, typically use dedicated 240V sockets.
The nominal voltage in the United States and Canada is specified to be 120V, with an allowable range of 114V to 126V (RMS) (−5% to +5%). However, historically, voltages such as 110V, 115V, and 117V have been used at different times and places in North America. The 120V standard was established in 1954 by the American National Standards Institute (ANSI), which also allows for two ranges of service voltage and utilisation voltage variations. Today, American homes and businesses typically have access to both 120V and 240V at 60Hz.
The frequency in North America, including the United States and Canada, is 60Hz. This is in contrast to many other parts of the world, where 50Hz is more common. The voltage and frequency standards in North America can be traced back to the late 1800s, during the days of Tesla and Edison, and these ingrained differences are unlikely to change anytime soon.
It is worth noting that while the voltage and frequency standards provide a general guideline, there may be variations within North America. Different regions or areas may have their own specific standards or historical variations. Additionally, as mentioned earlier, the availability of both 120V and 240V in North America allows for flexibility in wiring and appliance usage.
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Voltage and frequency in Japan
Japan's voltage and frequency differ from those of other countries. The voltage in Japan is 100 volts, which is lower than in most other developed nations. For instance, the United States uses 110-120V, while many European countries operate on 220-240V. Some appliances designed for higher voltages, such as hair dryers and irons, may not work optimally in Japan without a voltage converter. However, modern electronics like laptops and phone chargers typically have dual voltage capability (100-240V) and only require a plug adapter.
There are two types of frequencies in use in Japan: 50 Hertz in eastern Japan, including major cities like Tokyo, Yokohama, Tohoku, and Hokkaido, and 60 Hertz in western Japan, including Nagoya, Osaka, Kyoto, Hiroshima, Shikoku, and Kyushu. The frequency difference even extends to either side of the Fujigawa River in Shizuoka Prefecture and Itoigawa City in Niigata Prefecture. Kansai Electric's service area, which includes cities like Osaka and Kyoto, operates at 60 Hertz.
The voltage and frequency differences in Japan can affect the functionality and efficiency of certain appliances. For example, televisions and radios can be used without issues, while refrigerators and air conditioners will work but with reduced efficiency. On the other hand, washing machines and microwave ovens may not function at all due to the frequency differences.
If you are travelling to Japan or purchasing Japanese electronics for use overseas, it is important to be aware of these voltage and frequency variations. You may need to use voltage converters or plug adapters, which can be purchased at electronics stores or travel accessory shops in Japan. Some hotels may also provide adapters for their guests.
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Differences between mains voltage and driver-powered products
Mains electricity refers to the power that is brought into people's homes. The mains supply in the UK is an alternating current (AC) with a frequency of 50 Hertz (Hz) and a voltage of 230 volts (V). The power input for households is AC as the National Grid can only use AC input. The direction of the current and voltage changes 100 times per second.
Mains voltage is 240V lighting wired directly into the main electricity supply. It must be installed by a qualified electrician. Mains voltage-powered products do not require a transformer, but they have a limited lifetime compared to 12V lighting.
Driver-powered products, on the other hand, offer 12V lighting powered by a transformer wired directly into the main electricity supply. They are safer due to a lower electric shock risk, often more cost-effective to run, and have a longer lifespan. However, they can cost more to install than mains-powered lighting.
The two commonly used frequencies for mains electricity are 50 Hz and 60 Hz, with voltages generally in the range of 100-240 V. Single-phase or three-phase power is most commonly used today.
In the US, mains electric power is referred to by several names, including "utility power", "household power", and "AC power". The nominal voltage at the source is specified to be 120 V, with an allowable range of 114 V to 126 V.
In summary, the main differences between mains voltage and driver-powered products lie in their voltage, installation requirements, cost, safety, and lifespan. Mains voltage is higher at 240V, does not require a transformer, and has a shorter lifespan. Driver-powered products, on the other hand, operate at 12V, require a transformer, are safer and more cost-effective to run, but may have higher installation costs.
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Frequently asked questions
The voltage of mains electricity in the UK is 230 volts (V). The mains supply is an alternating current (ac) with a frequency of 50 hertz (Hz).
In the US, the nominal voltage at the source is specified to be 120 V, with an allowable range of 114 V to 126 V.
Voltages for mains electricity generally range from 100-240 V. The two most common frequencies are 50 Hz and 60 Hz.
