3kw water heater need a 20A DP (double pole L+N);
Else u need to wire up a contactor instead if you want to use original switch. A contactor allows a kancil to control the operation of a trailer load.

Thanks for the advice and guide.

Forgot to ask, could anyone help me identify which wire is Live(IN), Live(OUT), Neutral?



Thank you

Blue LINE (always ON regardless)
and the black to its 3 o clock is N

Red LOAD (switched ON/OFF) (based on LED).
and the black to red 3 o cllck is N

Confirm with test pen or multimeter because the previous installer is color blind.
Never trust the colour. Bangla tarak wireman cert one.

This post has been edited by ceo684: Jun 1 2021, 10:05 PM

Thanks so much for the clarification.
Yeah I agree that the person who worked on it obviously didn't do a correct job on the wiring.

Which one is Live line? Black or Blue?
There's Black, Blue and Green here. Green should be earth.

Usually is blue.

If you want to confirm, take out the DB box cover. Check what color the wire that connect all together on the terminal. That is neutral.

Black is usually live
Blue is nuetral

OK. Thanks for advice.
I just tried to open up another wall socket to check. This one has yellow / black / green. So, I can assume black is common colour for neutral, and yellow is Live as it's connected to the live terminal of the socket. Black should be common colour for Neutral line then.
Was confused because I always remember guideline for Brown / Blue / Green in the past which were Live / Neutral / Ground respectively. Blue was neutral. Probably colour scheme updates to accommodate 3-phase power supply network?

Brown/ blue/green wire code is for electrical appliances.

For house wiring, doesn’t follow this code. If 3phase incoming, red/blue/yellow is using and black is neutral.

The only color that all what kind of code have to follow is the green for earth.

Right. So in this case, can't really assume Black is usual Live. Have to really verify, either by reference connection, or by test pen, to be sure.

Generally in MY the code colours black is never L regardless flexicord or stiff (solid stranded) wire.

However there's a lot of champion never follow proper colour code. Assume installer is colour blind and test to be sure.

⚠️ There is a possibility idiota installed L and N terbalik. Pls test to be sure.

IN-WALL 230V wiring colour code typically
L red yellow blue, sometimes even white 🤦‍♀️
N is black
E is green

This post has been edited by ceo684: Jan 30 2022, 06:49 PM

Ini terbalik. Black is usually neutral in MY. Overseas code lain cerita.

Follow as what I write on top how to verify.

Take out the DB box front cover. You can see a bunch of wire connect together on the terminal. Earth and neutral.

From here you can know what color wire for the neutral.

Actually, I'm looking for a standardised spec for Malaysia power line colour code. Everyone should follow the same standard to avoid confusion nor misunderstanding.

Yes, I've monitored a foreigner contractor installing LED ceiling lights before. One out of several lights, he actually tested one light and tripped the power. He happened to connect earth line to LEDs neutral terminal. 🤦‍♂️ Can't imagine how many connection mistakes could have been hidden from owners' view without knowing. Reversed Live and Neutral connection may be another hidden danger.

It's in MS1979 spec and ST guidelines. Item 5.5


Attached File(s)
 ST_Guidelines_For_Electrical_Wiring.pdf ( 427.2k ) Number of downloads: 79

Now we all can technically discuss with proper standard reference from Suruhanjaya Tenaga. It's supposed to be governed by law too.
Thanks a lot for sharing and pointing out.
I think everyone should have this MS doc handy.

Electrical wire colour code is only reliable if its practiced at the main DB first.

Test pen can't differentiate Earth vs Neutral.

Multimeter is the better tool.

E & L = 230VAC
E & N = As close to 0VAC as possible, 1-2VAC is fine. Anything higher indicates improper wiring/installation
L & N = 230VAC

Majority of electricians rely on test pen. The minorities don't bother to use one as they don't understand E & N difference.

Sometimes with champion faux electrician the code is only followed up to the first light.. then switch relocated + new lights added in same line due to plaster ceiling what you see at the switch and other lights will surprise you.