this post was submitted on 20 May 2025
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American electrical systems are split phase 240V. If you want 240V, you just connect between both halves of the phase.
America has a lot of stupid, but the majority our electrical systems are very much NOT one of them.
The majority of the rest of the world has 220-230v per phase, with three phases. using all three phases gives you access to ~400v
Most of Norway (my house included) is still stuck on IT, so 230V phase/phase.
The only place it really sucks is for modern induction hobs where 25A @ 230V is a bit low (5,75 kW, max on mine is 7,2 kW) and the EV charge box (3,6 kW or 7,2 kW max instead of 11 or 22 kW).
They are however changing to TN for new areas.
Upside is that the earth current will be very small when you have a fault, so the system can function with it. I believe this is why critical institutions like hospitals run IT and not TN/TT.
Yes, and where I work the HV line is 13,800V.
And that's better than 3 Phase 230V in what way?
Lower voltage is less deadly.
Having a multi grounded approach provides multiple layers of safety for shorts.
Just to name a few.
If Voltage of AC is above 50V, it will break your skin and then the current and time kills you.
https://www.electricaltechnology.org/2020/02/killer-current-voltage.html
Multiple grounds? There's only one ground. You're walking on it.
120V/240V, Split-Phase – Center-tapped
120V/208V, 3-Phase – Wye
120V / 208V & 240V, High Leg – Delta
https://www.electricaltechnology.org/2023/03/standard-voltage-levels-in-us.html
Neutral and Ground are bonded at the first point of disconnect, which provides two paths to ground in the event a ground is lost was my point. Not that there are somehow "two Earth's".
What? America has one of the most unsafe electrical systems in the world. You might as well just stick two unshielded wires out of the wall and be done with it, it would actually be more convenient about the same level of safety.
As for crossing the phases, yes you can do that but how many outlets are actually set up like that, you certainly won't find an outlook configured like that in a bedroom. Each household probably only has one or two 240 volt outlets.
American electrical systems have bonded neutrals and grounds at the point of disconnect, so in the event of a ground fault, there are multiple layers of safety involved.
Lower voltage by using half of a split phase 240V means shocks are less deadly.
Electrical code also requires Arc and Ground fault protection on all circuits.
The biggest advantages to European electrical systems are smaller and fewer conductors, due to higher voltage, and appliances like kettles can draw more watts as a result.
Both systems have advantages and disadvantages, but saying that American Electrical systems are "the most unsafe electrical systems in the world" is bullshit. Visit India where people regularly hook up unsanctioned taps to live power lines or Central America where they put electric hot water heaters literally in the shower, conductors and all, almost always by Handyman Juan who doesn't hook up any ground fault protection.
I've got one. My bedroom was designed to be able to use a 240v window air conditioner.
I don't actually need that, because the house was renovated with central air, but the outlet is still there.
I've got a 30a 240v outlet behind my stove, a 50a 240v outlet in my garage. I wired an 80a 240v circuit for my parents hot tub. We've got no shortage of power here.
The only thing that annoys me about the North American power grid is that we only have three phase in commercial and industrial settings. We don't bring three-phase power to the home.
You want to see stupid, go look at the ring circuits they play with on the UK grid. Completely unsafe.
I mean, your outlets definitely are, compared to what we have as a standard.
I will take Technology Connections' opinion on it over yours, but yes having two pin outlets where if you start plugging it in the live connection is exposed during the process is very much stupid
Except with proper arc and ground fault protection on a circuit, which is mandatory on basically everything in North America now, you could half insert a plug and stick your tongue to it without getting a shock.
He did day that about our plugs a lot. Maybe you would you like a link to the technology connections video saying basically exactly what @[email protected] said about our split phase 120/240 setup then?
https://youtu.be/jMmUoZh3Hq4
Our household wiring standards are intrinsically safer than the UK. They need the overbuilt outlets and plugs that Technology Connections likes, because the UK took so many shortcuts on their building wiring.
Can't really fault them: they developed those standards during a massive copper shortage. To minimize copper use, they ran as few circuits as they could, which means each circuit is drawing absurd loads. They developed "ring circuits" which used undersized wiring and are one loose wire away from an overload. They had to build excessive protections into their plugs so they could safely plug every device they owned into one high-power circuit.
We used dozens of properly-sized circuits.
Yeah, but why compare it to UK? It's the US of Europe, compare it to the European standards.
You referred to Technology Connections. Unless I'm mistaken, he had an unhealthy obsession with UK plugs.