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Why America Uses 120V while Europe Uses 230V?

Zenthral Code

25,972 views

Why does the United States still use 120 volts while much of Europe uses 230 volts?

It is not just a difference in plug shapes. Higher voltage can deliver the same power with less current, which affects wire heating, copper use, circuit ratings, appliance design, and electrical safety. So why did the world not settle on one household voltage?

In this video, we trace the history from Edison’s early 110 volt lighting systems to Europe’s 220 volt and 240 volt systems, the later 230 volt harmonization, and the hidden 120/240 volt split phase supply inside a typical U.S. home.

You will learn why 120 volts and 230 volts are not simply outdated versus modern, why high power American appliances already use 240 volts, and why replacing an established electrical standard is far more difficult than changing an outlet.

Chapters:

00:00 Why plugs and voltage change across continents
01:16 The physics of 120V versus 230V
04:04 Why America began at 110V
05:34 Europe’s different voltage systems
06:12 How 230V became the shared standard
07:14 The hidden 240V supply in U.S. homes
08:03 Copper, wire heating, and circuit ratings
09:48 Why both voltage systems survived

Sources and further reading

U.S. Department of Energy, Electricity Production and Distribution
https://afdc.energy.gov/fuels/electri...

U.S. Department of Energy, Electricity Transmission: A Primer
https://www.energy.gov/oe/articles/el...

International Electrotechnical Commission, IEC 60038 standard voltages
https://webstore.iec.ch/en/publicatio...

U.S. CDC and NIOSH, Electrical Safety: Safety and Health for Electrical Trades
https://www.cdc.gov/niosh/docs/2009-1...

EDF, The energy of France for 80 years
https://www.edf.fr/en/the-edf-group/t...

Disclaimer:

This video is for general educational purposes only. It is not electrical, safety, installation, or repair advice. Household mains electricity can cause serious injury or death, including at 120 volts. Electrical supply arrangements, appliance ratings, wiring rules, and legal requirements vary by location and installation. Do not modify wiring, outlets, panels, breakers, plugs, or appliances based on this video. Use electrical equipment only within its rated specifications, follow applicable local codes, and consult a licensed or otherwise qualified electrician for electrical work.

#Electricity #ElectricalEngineering #Voltage #120V #230V #PowerSystems #ElectricalStandards #ACPower #SplitPhase #HouseholdElectricity #ElectricalSafety #EngineeringExplained #EnergyEngineering #USvsEurope #ZenthralCode

20 Comments

@ZenthralCode Creator 2 days ago Pinned

Which electrical system do you work with? Have you ever used imported equipment, a voltage converter, or an appliance that was not rated for your local supply?

@koppadasao 1 day ago (edited)

In my childhood, 40 years ago, the voltage system in Norway was 220V. It was later increased to 240V, with almost all appliances being tolerant to the increase. Norway has also transformed from using Russian plugs to using the German Shuko standard.

@vsijben 1 day ago (edited)

The perceived higher electrucution risk in 230V systems is mitigated by the mandatory use of RCD switches in the fuse panel. These cut off the power before the fault current exceeds lethal levels.

@solawiking 1 day ago

Inn Norway 🇳🇴 we normally use 400vphase TNC. And 230v phase to N

@OsmanJanneh-y8t 2 days ago

🎁🎁🎁 thanks very much sir , I really due appreciate it. You're ready giving us a beautiful and beneficial knowledge and understanding in this field.

We love the teaching and I'm looking forward towards the next topic or video

@36SSB 1 day ago

I'm an ex sparky that lives in Perth Australia. One of the first things I noticed when I was an apprentice was that there were many 40 cycle motors still in service. They worked fine for what they were doing but we changed them out as needed. Perth in the early days was on 40 cycles and changed over to the Australian standard of 50 Hz. Another thing that I remember was the supply voltage at one of the houses I lived in we had a constant 260V supply.
When I contacted the supply authority about it one of there Techs informed me that we were close to the distribution transformer and seeing it was a very long run to the last houses the voltage was increased for the volt drop. He also mentioned that it was a common practice. LOL
When watching clips from the US that have electrical installations being done I always smile when I see the cable and wire sizes, so big. Even the outlets and switches look oversized.
Locally we use 1.5 mm for light and 2.5 mm for power with the corresponding 10 and 15 amp rated RCD's.
Always interesting to see how others live...

@heronimousbrapson863 1 day ago

For a given impedance a 240 volt system delivers twice as much current as 120 volts does. The reason why a 240 volt appliance of a given power rating draws half the current as its 120 volt counterpart is that the 240 volt appliance has an impedance four times that of the 120 volt one.

@eos-fan 16 hours ago

The voltage is not limited to the 230 V between a phase conductor and the neutral conductor; the voltage between phases is 400 V. Every house has a three-phase connection, making it possible to connect high-power appliances—such as water heaters or electric stoves—using three phases.

@davidgrisez 2 days ago

In the condominium building that I live in most of the power is 120v 60Hz single phase. The Heat Pump Air Conditioners run on 240v single phase. Also the common area garage sump pumps run on 240v single phase. There is one item in my building that runs on 240v three phase. That one item is the building elevator runs on 240v three phase.

@okaro6595 2 days ago

Actually the 220-230 V is relatively new in many places. Finland adopted it universally 1957-62. I done countries it was in the 70s.

@DerrickPatten-j1i 22 hours ago

Our homes here in the US actually receive 240V from the transformer, but we use a split-phase system where the secondary winding has a center tap wired to the exact middle. Three wires run from the Transformer to the residence. Inside our breaker boxes the three wires are two hot leads and a neutral between them go through a main breaker that can be rated 100 amps, 200 amps, sometimes even 400 amps! Because of the center tap each lead delivers 120 volts of power and are 180° out of phase with each other as measured from the neutral wire. You have two rows of Breakers stacked vertically but though they appear in the same row their connection alternates from one bar to another. For lights and most appliances 120 volts is more than enough. For devices that require more power a double breaker is used that connects to both leads and combine their voltages to the total 240. We can have 240V outlets with amperages ranging from 15, 20 (these outlets have the same footprint as our standard 120V ones and look almost identical at a glance), 30, 50 (these outlets are much more robust and can deliver power up to 10,000 W), 60, or more!

@MrEqtube 1 day ago

In Finland, and have no reason to assume that situation much different elsewhere, local private electricity companies started around 1880. They provided electricity in form that the power plant happened to do: AC at some frequency or DC - both at some voltage! No standards! You happened to live in area supplied by company A, you got your lamps and appliances that were suitable for you.
In Finland it took decades until unified electric network reached places that were already electrified, latest place was district in Helsinki - they got 220/380V service in around year 1960.
In Helsinki alone, there were six or seven electric power plants in late 1800's.
USA was just unable to move forward - the rest of the industrialised world has done that!

@barrycameron8469 1 day ago

Good description of the difference between 120v and 230 v electrical systems. One question that wasn't addressed in this video is why is the frequency of power 60hz in America and 50hz in most of Europe?

@Sunspot-19 1 day ago

Just go with 480 3 phase and you're good to go!!

@bipl8989 2 days ago

I have lived in both 120 and 230V countries.
230 has many advantages.
Faster Performance: High-draw appliances like electric dryers, ovens, and EV chargers operate much faster due to higher power delivery.

Motor Efficiency: Electric motors start more easily with less startup torque and run cooler with reduced winding resistance.

Panel Balance: 240V loads draw equally from both phases, helping to balance the electrical load in a home’s main panel.

Cost-Effective Wiring: Because less current is needed to move the same amount of power, electricians can use smaller diameter wires for heavy-duty circuits

The higher shock hazard is basically nonexistant, because Europe requires a differential voltage breaker. It breaks a fault current in 10 to 40 miliseconds. At a max of around 30 mili volts. I've been burned by 120 because of the longer contact time, but never by 230, just a quick tingle. 120 hurts.

@BobDiaz123 2 days ago

Thankfully the switching power supply can operate in a range of q00V to 240V. If your device uses a switching power supply, read the label, odds are good that you only need a plug adapter.

@equadvif4475 1 day ago

Since the US has 2x120V, which can be combined to 1x240V, isn't there a trend starting to mount more 240V sockets around the house for more powerful devices? Nobody needs to be forced, just offer two different outlets offering both voltages and over time the 120V will probably die out.

@stephenhwong1972 2 days ago

Industrial plant uses 480 volts 3 phase

@joeblow8593 1 day ago

The U.S. also uses 240 volts in addition to 120 volts.

@Mbarnstein62891 2 days ago

Continental Europe used to use 220 volts while the UK and Ireland used 240 volts. When the EU was forming, it was agreed to meet at 230 volts, but it is still common in the UK and Ireland to find 240 volts.