Anyone knows what is the max power usage I can use for single phase?

Eg, can I on 1x 2.5hp aircon + 1.5hp aircon at the same time together with heater pump and oven?

Should be ok with Single phase.

Single phase are good enough for your usage.But the bill amount could be higher compare to if you upgrade it to 3 phase and wiring are done properly.

Also, if your house got burnt down and you are still on single phase, insurance company have the excuse to deny your claim.

https://www.tnb.com.my/residential/my-tnb-a...ctricity-supply
Do read this before trying to be stupid and slapping your own face.
Insulting, trolling does not means you are good.

Well, I do understand this from the beginning. Only sinkalan like you refuse to accept your mistake. Even when I applied for electricity supply, the old version form stated > 2 air cond already need 3 phase.
No doubt applying 3 phase need to pay more, but they will reduce the deposit by "paying" your monthly bills when your monthly usage are lesser.

Well, I do understand this from the beginning. Only sinkalan like you refuse to accept your mistake. Even when I applied for electricity supply, the old version form stated > 2 air cond already need 3 phase.
No doubt applying 3 phase need to pay more, but they will reduce the deposit by "paying" your monthly bills when your monthly usage are lesser.

Well, TNB's statement indeed are too general and I would say it is quite misleading in some sense.
Anyway, just put a probe on a plug point, it is showing 250V.

bro.. say you switch on all the lights in your home..

Now switch on all the aircons in your house..

Now go boil some water and also use the rice cooker.. Pop some popcorn in the microwave on high..

Switch on all your TV's, hifi on full and connect all your sockets chargers, and get your maid to start ironing your clothes..

Make sure all those are on then go and take a hot shower.. using the instant hot water heater

That's the max power you can use for single phase.. also known maximum demand..

Short ans: Look at your DB incoming mcb ampere rating..  Power = Volts I (amps) x pf => 240x40x0.8/1000 kW => 7.68kW(on a 40A single phase DB)
If that doesn't trip your DB after you finish your shower then..

Yes.. you can switch on 1x 2.5hp aircon + 1.5hp aircon at the same time together with heater pump and oven

No problem with that, but make sure you buy heavy insurance, scratch the fuse's 100A wordings and put 30A wording back.
For gaining more knowledge sake, go to TNB or ST's website, that's the place you gain knowledge, not in forums where misleading info are usually being spread.
Single phase only can support up to 60A, inside wiring only can support 13A unless the wiring is done by your self where from buying, hacking, installing and conceal it back.
Putting 100A of fuse but wiring does not changed, you will end up with wire insulation melted follow by exposed wire shorting together and causing fire.
His way are very misleading as you won't know what is happening inside the wall, short term testing won't tell you anything.
If you don't believe me, get a cheapo extension cable and run a 1500W oven for 5 minutes. Then see what happen to that extension.

what is the maximum loading for 3 phase?

my house has three phase and existing:-

1) central solar water heater with pump

2) 7 a/c points

can I add another 4 a/c points?

At max I think only 4-5 a/c will be on at the same time. Just for sake of discussion we can assume each a/c to be 2HP.

What's the best load allocation for 3 phase?

Do i assign 1 phase for each floor or 1 phase for just aircon, etc.... Thanks

It is depending greatly on the wireman you hired. Some will do a proper job while some will not.
Rightfully each phase should be serving equal load, like each phase serves 2 air conds if you have a total of 6 air conds. You won't be getting a true balanced load if each phase serves a particular section, like 1 phase just to serve 1st floor, 1 for kitchen and another for living. In this case, you will end up with 1 phase running on higher load which defeat your goal.

Nope, not that right. If at the end of day only 1 phase out of 3 that running higher load, it don't serve any purpose of load balancing.
Using 3 phase in residential are overkill in some sense but if it is already in 3 phase, is still good to balance the load, this is more to keep the wire cool.
Remember, heat generated = higher resistance.

Hello knowledgable sifus, I have come to seek for advice. My new house which is a twenty year old apartment can't boil water with an electric kettle and microwave food at the same time. The electricity will "jump".

The fuse on the wall states 40A and I think it is a single phase without db box. It's an old antique wooden box .

My question is can I upgrade to to be able to support 4 a/c, 1 instant water heater, oven, microwave oven and electric kettle/hob if on simultaneously?

Can single phase support 6 ac and 2 fridge?