The wiring is correct as done by the electrician in your picture. You are wrong in your assumption that the electrician has done a dangerous job. I'm not trying to be condescending here, but please understand the wiring standards before you do wiring. Please be safe.

You're looking at the colour code for flexible wire. Sorry, looking again at the image you attached, the wiring standard in Malaysia is still the first one on the left, for wiring within the wall. Where did you get the image from, that shows brown as the live?

The only difference is that the Earth/Ground cable is solid green, not green striped yellow in M'sia.

As ceo684 has posted before, the colour code within the wall is different from the colour code for flexible wire.
This post has been edited by stormer.lyn: Jun 22 2020, 07:43 PM

The wires in this image are attached correctly

Yes

What you want to do (for all intents and purposes) is not possible

Measured with respect to (wrt) what? After all, you can't connect only one probe of the multimeter and measure a voltage.

Again, measured wrt to what? If you say measured wrt to Earth, the N and E wires are independent to each other (for M'sia standard wiring) so any stray voltages on the wires do not complete a circuit. Does it matter what small voltage it is at all, as long as the L-N voltage is 230Vac?

I don't understand the point of the sentence.
"quick and useful"
"slow but useful"
"useless", and it doesn't matter if it is quick or slow as it is useless. E.g a hammer is a useless tool to measure voltage. Once useless, then quick or slow doesn't play a part anymore.

If the testpen lights, then isn't this "safe"? After all, you won't touch a wire if the testpen lights. The problem is that the testpen doesn't light even if there is a voltage present. A false positive makes you more cautious, and hence safer, no?