Electrical have rule to follow. Not what you want 100A this and that.

Max single phase is 60A.  So everything must be content in 63A. Fuse or isolator. More than that, advise you to get 3phase.

Your single room heater and aircon share the same point is not recommend. Even you change the MB to 40A, your wire spec exceed the actual current running. Heater 3.6kw and aircon 1.5HP 1.2kw = 4.8kw. Your 2.5mm wire is running hot.

As a precaution, separate into 2 point with 2pcs MB is the proper way.

Just sharing a 3-phase upgrade guide for everyone’s benefit since there isn’t clear instructions on what is the process and how to go about it. So I hope this will be useful for future readers.
____________________

Step 1:
Do your necessary preparation works such as (i) preparation of meter box compartment at required location; (ii) converting your distribution box to 3-phase ready; (iii) doing the required armoured cable laying from meter box to distribution box;

Tip: Hire a qualified/certified electrician to do all this. Basically, you want to be “3-phase ready”.

Step 2:
Ask your electrician to prepare the meter board and 3 phase cables wiring as per pic below. Note that this is a sample but it should look something like this depending on your requirement.
By this stage you are to called 3-phase ready.

Tip: Ask your electrician to ensure its as per TNB’s required specs. You will be able to find the spec pdf on TNB’s website.

Step 3:
Go to myTNB’s website, register and then apply to upgrade your power to 3-phase.

Step 4:
Select a TNB licensed company from the list as your contractor and to do your submission to TNB (i.e runner). At this point, you only need a runner to do the submission to TNB for you. You have no choice but to select a company from the list as your runner.

Note: they can also do all electrical works to be 3-phase ready but its your decision to hire your own contractor or use one of the panel contractors.

Tip: call up each company you have shortlisted to ask them how much are their submission fees are. You would want to let them know that you are 3-phase ready and only need to do the submission process to TNB. Runners generally charge a fee of RM600 to RM1.5k depending on which company you engage. Typically, they will charge a high fee of RM1.5k.

Step 5:
The runner will then contact you to come over to your house to take pictures of the meter compartment, wiring board and nearest pole to pull the cable for 3-phase power. This is to ensure everything is in order as per TNB’s specs before submission.

Step 6:
Once the runner has made the submission to TNB, it will take around 3 weeks for them to assess how best to pull in the cable to your house. The runner will inform you if they are putting a new pole up or digging the road.
Note: digging of road will require special permit from the local council and it might include additional cost to be estimated by TNB.

Step 7:
After the assessment period, TNB will send you a invoice to be settled prior to starting of construction works (i.e pulling the cable and installing the meter).

Typically, fees are:
1. Contribution fee – RM1,700
2. Deposit top for 3-phase – RM200

Note: Generally, the cost should be within the above figures unless special case where it includes road cutting where TNB does not want to bare or your area is really secluded.

Step 8:
At this stage, TNB should have completed the erection of the pole and installation of the meter. Further appointment will be made to install the fuse and remove your old single phase meter etc.

Step 9:
Congratulations! You now have 3-phase power. The power connection process is very simple. TNB will put in 3 fuses to complete the connection. 

Note: TNB is NOT responsible for anything that is inside your house compound so if there are any power or wiring issues then it’s up to you to rectify it hence a good electrician is important. TNB’s  scope of works is only limited to up to the meter compartment box.

Hi I'm trying to upgrade my house to 3phase, however the pole is not in front of my house but opposite. So they are are suggesting me to add another pole infront of my house which I dislike.

I asked them for the price of laying the cable underneath the road. They quote me RM25k!
Does it cost this much?

Just sharing a 3-phase upgrade guide for everyone’s benefit since there isn’t clear instructions on what is the process and how to go about it. So I hope this will be useful for future readers.
____________________

Step 1:
Do your necessary preparation works such as (i) preparation of meter box compartment at required location; (ii) converting your distribution box to 3-phase ready; (iii) doing the required armoured cable laying from meter box to distribution box;

Tip: Hire a qualified/certified electrician to do all this. Basically, you want to be “3-phase ready”.

Step 2:
Ask your electrician to prepare the meter board and 3 phase cables wiring as per pic below. Note that this is a sample but it should look something like this depending on your requirement.
By this stage you are to called 3-phase ready.

Tip: Ask your electrician to ensure its as per TNB’s required specs. You will be able to find the spec pdf on TNB’s website.

Step 3:
Go to myTNB’s website, register and then apply to upgrade your power to 3-phase.

Step 4:
Select a TNB licensed company from the list as your contractor and to do your submission to TNB (i.e runner). At this point, you only need a runner to do the submission to TNB for you. You have no choice but to select a company from the list as your runner.

Note: they can also do all electrical works to be 3-phase ready but its your decision to hire your own contractor or use one of the panel contractors.

Tip: call up each company you have shortlisted to ask them how much are their submission fees are. You would want to let them know that you are 3-phase ready and only need to do the submission process to TNB. Runners generally charge a fee of RM600 to RM1.5k depending on which company you engage. Typically, they will charge a high fee of RM1.5k.

Step 5:
The runner will then contact you to come over to your house to take pictures of the meter compartment, wiring board and nearest pole to pull the cable for 3-phase power. This is to ensure everything is in order as per TNB’s specs before submission.

Step 6:
Once the runner has made the submission to TNB, it will take around 3 weeks for them to assess how best to pull in the cable to your house. The runner will inform you if they are putting a new pole up or digging the road.
Note: digging of road will require special permit from the local council and it might include additional cost to be estimated by TNB.

Step 7:
After the assessment period, TNB will send you a invoice to be settled prior to starting of construction works (i.e pulling the cable and installing the meter).

Typically, fees are:
1. Contribution fee – RM1,700
2. Deposit top for 3-phase – RM200

Note: Generally, the cost should be within the above figures unless special case where it includes road cutting where TNB does not want to bare or your area is really secluded.

Step 8:
At this stage, TNB should have completed the erection of the pole and installation of the meter. Further appointment will be made to install the fuse and remove your old single phase meter etc.

Step 9:
Congratulations! You now have 3-phase power. The power connection process is very simple. TNB will put in 3 fuses to complete the connection. 

Note: TNB is NOT responsible for anything that is inside your house compound so if there are any power or wiring issues then it’s up to you to rectify it hence a good electrician is important. TNB’s  scope of works is only limited to up to the meter compartment box.

Good day to all,  I got noob question.

Is 3 phase = able to provide 3 x the Amp of single phase? So if single phase max is 63A so 3 phase = 3x63A?

My parents want to start a small home baking business and are planning on getting a commercial oven. Would you guys recommend that we change to three phase?

We have a lot of aircons in the house but pretty much never on them all at the same time. At most 2 on at the same time.

It will depend on your typical load amps right now and what is the supply rating ie 40A or 63A.

I don't even know how to check that 

That can be checked by an electrician with a clamp meter. As this is done "hot" while electricity is still running.

Generally if the oven is below 3000W then should be no problem.
But if the oven has signs saying "requires permanent installation" or the likes, OR if power exceed 3000W then you still have to pull new wiring as the standard 13A socket is NOT sufficient.

My parents want to start a small home baking business and are planning on getting a commercial oven. Would you guys recommend that we change to three phase?

We have a lot of aircons in the house but pretty much never on them all at the same time. At most 2 on at the same time.

i think should be ok.

if it trips the breaker then you know then there is an issue

yeah, can consider just use first to see if there are any problems.

can save money if no problems 

I'll add on - if the oven came with a 13A standard plug will not have issues.

If the oven doesn't come ready-to-use with a plug or requires 415V (three phase), then it will be the first sign of "requires professional installation". Some commercial oven use 415V.

Hi guys, in Malaysia or Strata any rules saying that we cannot run concealed wiring without pvc conduit?

What wires should I use for concealed wiring 1.5mm for light and fan?

Other than double pvc what is other options?

Generally you can see CHAPTER 5 CABLE SELECTION in "ST GUIDELINES FOR ELECTRICAL WIRING IN RESIDENTIAL BUILDINGS 2008". PDF available online.

You are pulling new wire from DB box or connecting to existing point?