Using an external laptop battery

Using an external laptop battery

Found an external battery for laptops. He gives out 3A at 19V. And on my laptop it says 19V, 4.74A. Will the laptop even turn on from this battery?

Which RCD should I choose if the load is 5 kW?

Which RCD should I choose if the load is 5 kW?

I want to put an RCD on 2 machines, the load on them will be a maximum of 5 kW. What should I choose an RCD by power and which machines to put? Do you need RCD protection or not?

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