I did not mean doing home electrical work. That I do leave to professionals. But there are times I have a device on my bench that is consuming 230V AC. I have

I did not mean doing home electrical work. That I do leave to professionals. But there are times I have a device on my bench that is consuming 230V AC. I have a 3kVA separation transformer set up, which makes it safer for me to work with the device (there is no potential between the DUT and the ground). Technically, even without the transformer the residual current protection should kick in and prevent you getting killed between device and the ground. I have tested mine couple of times to check whether it works. But I somehow still feel better with a separation transformer. But there is still the problem that I could touch different parts of the device that are at different potential and then I could get zapped this way. There is not much protection there. Solution -- If you must, don't ever touch more than one place at a time.