You need to redo your home DB (distribution box) wiring from one phase to three phase
This includes add in rcd,mcb,busbars and a new box, the new three phase cables from the kwh meter to the board, testing and commissioning. Then liasing for the kwh meter installation

Get a second or third party quotation to make the best decision

[quote=trust4you,Sep 18 2018, 08:24 PM]
boss usually how much does that cost? for the
add in rcd,mcb,busbars and a new box, the new three phase cables from the kwh meter to the board, testing and commissioning?

[/quote

For a metalclad board 3 row type the material cost alone is roughly rm1500 inclusive 3x100mA RCD, 3x30mA RCD, and 3x10mA RCD for general lights/fans, 13A sockets and water heater the others general mcb's, submain short length PVC cables being comparatively cheaper.

The main cost is the skilled wireman labour to install the box, the connections, all the continuity/insulation/earthing testing to make sure functionality tripping, correct impedances of the earthing system, polarity for the phases and the insulation for the connection cables for his portion of the works. Note this does not test the house wiring at all only the new cables from kWh meter to DB, and the DB itself. Plus percentage profit usually 20% to 50%of the works.

You can get another compare quote and negotiate to make sure you are not getting taken advantage.

For five one HP aircon running at the same time, the possibilities of all inductive loads being on simultaneously very high due to the auto temp sensors of the aircon.
The standard running amps roughly 4.5Amps and starting amps 6x minimum thus adding other auxiliary loads will overload the standard 63amps rated protection devices and cabling connection.

For such a situation it is recommended to split the loads to 50%of the rated protection device and cabling connection. Thus adding a three phase incomer supply for safety and peace of mind.For minimizing risk hazard of an electrical fire

Thefor are situations where a very high quality material and installation where the 63Amp rated fuse and oversized cabling will not blow fuse but such situations are discounted from the average situation.

Conclusion for single phase to three phase per standard TNB supply 63amp HRC fuse c/w 16mm2 PVC cable is correct recommended.

Edit* residential internal wiring is only 40/63Amps with 16mm2 PVC copper conductors. O/H hard drawn aluminium conductors to be sized one level higher.

This post has been edited by Richard: Sep 19 2018, 05:06 PM

Correct .. Minimize the start stop of electrical motors using electronic speed control by vary the frequency (actually pulse width modulation,)

It works..

DC to three phase AC using ESC(electronic speed control) same. Expensive right now but getting cheaper as more of the electronic components all built-in. Those are expensive to play with.. Right now only familiar with linear through hole and smds.lol.

This post has been edited by Richard: Sep 19 2018, 06:32 PM

The reason is a single phase kwh meter supply is limited to maximum 63Amps as the incoming supply cable size(16mm2) fixed for residential supply.

If your house uses more than TNB recommends you apply a three phase kwh meter which means you 3 times 63Amps.

So keep your existing wiring but any additional will be wired to another phase to prevent overload