Crossy

Torx!

It may just be a stuck relay on the control board. A good, solid thump to the relays with the handle of a big screwdriver will often free things up.

OK it's like this. You are measuring a small (maybe feeling a bigger) voltage between two "grounds". This may be caused by a high resistance connection in the ground coupled with naturally "leaky" appliances (anything with a mains inlet filter), they don't necessarily need to be in your condo if other units share that ground to the re-bar, or even capacitive coupling from other live wires if that connection is really, really bad. You need to eliminate/minimise this voltage. You do this by making sure that your electrical ground is as good as practical (clean up that rusty connection). If this isn't practical/possible then you can use your "better" ground (the water pipe) in addition to the iffy main ground. From an earlier post: - Without visiting your place with a box full of test-gear it's not possible to define exactly what you are seeing, but the suggestions should clear most of the common issues. Try the simple fixes first. When they don't come back and we can delve deeper.

After a whole week of unemployment, I've completely lost track of what day it is Gawd knows how I'll cope when I actually retire!

That EV is looking even more attractive

Get yourself a proper insulation tester and learn how to use it and you'll be good to go. But one doesn't usually use a voltmeter for measuring earth leakage anyway. I've already given you some solutions, if you choose to ignore them that's your problem.

Most commercial transport uses diesel which is pegged to < 30Baht per litre.

We have had cases in the past with members reacting negative/confused/haha to all of another members posts, it's decreased significantly since reactions were made anonymous but still happens occasionally. Stalking of members in this manner is not acceptable. "Appropriate" action could mean no action of course.

Seriously, if you think "somebody" is stalking with post reactions just email support[at]aseannow.com with a couple of links to relevant posts. "Appropriate" action will be taken.

Currently there's no option to clear. Just look at the top ones

The hairs got trapped far more easily than anything slightly larger ...

My granny used to have a wooden outside lav seat, it was lovely in winter, not cold on the arse at all But. The ruddy thing split, as wood is wont to do. Of course, the split opened up when one sat down, and closed again as the weight went off ... "Things" became trapped!!!

Why did I immediately think of "melon-headed tourists" (we are talking about Phuket after all)?

https://www.intelligentliving.co/tribe-philippines-carves-scooters-wood/

A Purple Range?

Early? I see 3 empty cans by my desk

OK. "Leak" won't affect your energy consumption. TT is just a type of earthing system https://en.wikipedia.org/wiki/Earthing_system most of Thailand is now TNC-S with MEN but don't go trying to convert. You could try to get the building handy-person to clean up the connection to the building steel which ought to solve your problem. Otherwise just connect your earth to the water pipe and be happy. Very important - DO NOT connect to the pipe if it's part of the fire-suppression system (Yes, I know I'm repeating myself here).

OK RCBO - check That there's a wire running to the building steel at least means there's been an attempt to get a decent ground in there (how good does that connection look?). System would be TT, no apparent link N-E at the board. That your RCBO isn't tripping suggests that there isn't a dangerous leak, does that tingle go away if you link the existing ground to the water-pipe?

Give the man a banana!!! I admit it took me rather longer than it should have

So where is your electrical ground (that's not your water pipe) coming from? If it's actually floating (not really connected to anything) then you could be seeing capacitive coupling from a live wire or possibly the mains inlet filter of your desktop PC (or pretty well any modern appliance). 4.5V isn't going big enough to feel. Please post a photo of the distribution board with the lid off. Are you in a rental or do you own the condo? Note that while not ideal you could use the water pipe as a functional ground (IF it is NOT part of the fire suppression system) but you would need an RCD/RCBO for safety as the actual properties of that pipe are unknown.

But not for measuring a leakage CURRENT.

What are you using as the reference point for the 4.5V? (where is the other lead of your voltmeter?) It's 99.99% chance there's no problem at all, but could you post a photo of your distribution board with the lid off (care please). We need to see what supply connection you have in order to be sure if there's an issue or not.