Panasonic DL-EJX10 Japanese Toilet Seat Earthing and 100V to 230V Transformer Use

Gentlemen, come to my rescue!
I recently brought back an electronic toilet seat from Japan (the same type that so impressed ski jumper Piotr Zyla in Sapporo).
All domestic appliances in Japan are on 100 volts (they seem to have to have it that way, because of earthquakes). There were, of course, 220 volt appliances made for Asian consumers, mainly Chinese, but they cost 4 times as much, so I decided it would be much cheaper to just use a transformer. Besides, I was afraid of that Chinese 220 volts, because in Europe it's been 230 volts for a long time, and it could burn my ass. In the Most Blessed Republic I bought a transformer (a regular toroid with the right excess power, screwed it to the ceiling), wired the whole thing up and the equipment is up and running, i.e. it's currently in the testing phase. Everything works fine (although this is a very simple model, it has few functions and really can do very little) but I am concerned about the earthing. According to the instructions, this unit absolutely has to be earthed - and of course I earthed it, but directly - i.e. to the pin of an ordinary 230V socket from the domestic installation. I (I freely admit) am not very familiar with advanced electrical circuits. Is a piece of equipment powered by a 500 W transformer and earthed in this way completely safe for the user? There are heaters, a pump and water in the board, and there is also the (rather illusory) danger that someone uninformed ... will water the electronics and electrics (with water, as there is a washbasin next to it, or with something else, as things can vary). For this reason, I would like to ask anyone with knowledge of the matter - isn't there still a need for additional protection?
I would be grateful for any advice or suggestions. Just in case someone thinks I am joking, I have attached a photo which shows that the Japanese board does not go very well with the Polish porcelain.
Greetings
Bynieq

as far as the water is concerned I wouldn't worry I think the control panel is adequately protected. I would worry about those wires at the sink itself. I would ask what was the power cable at this board with or without a plug, how many wires ?

> as far as water is concerned I wouldn't worry I think the control panel is adequately protected.

Not necessarily! There are different standards in Japan, no one ever details standing up there, so you don't have the problems you might have here, ie in RP.

> I would worry about those wires at the sink itself.
> I would ask what was the power cord at this board with or without a plug, how many wires ?

The standard one, which is Japanese.
In Japan, each plug has two wires and sometimes (with more demanding appliances) additionally an earth wire (green-yellow) - but this one is always separate ! (you can see it in this photo I posted). In Japanese sockets there is sometimes a separate entrance, just for this particular cable, but it is not a pin - as in RP - but a hole into which you can insert the end of the cable. Such sockets are found in toilets, kitchens - and sometimes even in rooms - but only where heavier equipment is connected (e.g. air-conditioning, cooker, microwave, etc.).

Regards

Bynieq

I see no one else has written about the aforementioned issue as I have written before I am always concerned about the wiring next to the sink. As far as your appliance is concerned what class of electric shock protection is it really in ? I may put a stick in the anthill but in this case you have used a 230/100V transformer is it not an isolation ? Does the transformer meet these conditions ? Maybe I am not really directing these questions to the author of the post.

If it is an isolation transformer then your device i.e. the board is isolated from the mains and in this case I would have an objection to the earthing you have done. If you use device separation the secondary circuit should not be earthed or connected to any
any other circuit and it should be done in such a way as to reduce the possibility of ground shorts in it.