Volkswagen, Porsche, and Audi finally say they will use Tesla's EV charging plug

Re:Volkswagen, Porsche, and Audi finally say they will use T... by ajsnigrutin on Wednesday December 20, 2023 @02:03PM (#38712302)

Let's say you have a cable with 2.5mm^2 wires, each of which can carry 20A of current to stay within code. At 230V that's 4600W.

Now you want more power, to keep the math simple, let's say 13800W (3x the power above).

With a one phase system, for 3x the power, you need 3x the size of wire, so 7.5mm^2, ie. 3x the amount of copper (since all wires, neutral and PE have to be that size too).

With a three phase system, you can get the same power with 3x2.5mm^2 live wires (+1 neutral + 1 PE), so instead of 3x the amount of copper, you only need 5/3's of copper to get 3x the power.

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Re:Volkswagen, Porsche, and Audi finally say they will use T... by BenjiWiebe on Wednesday December 20, 2023 @10:22PM (#38716647)

Not sure what PE is in this example, but you don't need a neutral in 3 phase.

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Re:Volkswagen, Porsche, and Audi finally say they will use T... by ajsnigrutin on Thursday December 21, 2023 @02:58AM (#38718080)

You don't need it in a "triangle"/"delta" wiring, but you need it in a "star"/"Y" - https://www.electronicshub.org/comparison-star-delta-connect...

PE is protective earth, grounding wire. Usually you need PE and neutral lines separate for FID (GFCI) protection.

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