Can check if existing wiring is done on 1phase, if want to change to 3phase, is it possible? And will I need to redo all my existing wiring?

Can, yes, no

Thanks. You are electrician? Haha, just wondering whether it is worth to do.
(read the cost could go to replace could go to 10k)
Currently, have 5 airconds. But usually only 2 airconds will on simultaneously.
Perhaps during CNY, will on like 4 units together, for a week.

When u replace ur single phase meter to 3 phase meter u should balance ur load accordingly & this might involved rewiring internal load.

Or u can let it be but if like that what is the purpose of changing to 3phase? Or possible ur gonna planning for future sub-DB which only u know ur future usage

Not required to go 3phase if total load never trip the whole house MCB.
It should be sufficient as long as you don't operate all your electric cookers + all aircon + all WH on simultaneously.

Last time my place's incomer only 40A so previous owner already upgraded 3phase. But if your incomer is 63A I think its not required to do 3 phase.

This post has been edited by ceo684: Oct 22 2021, 11:14 PM

I see. Thanks, since house currently using smart home setup, and previously electrician did warned about it.
Guess I will monitor and upgrade when the trip become more common.

i wonder if anyone got any latest update on the estimated cost now?
my electrician told me easily more than RM10k...

i wanna apply resume 3 phase electricity also 2.6k d just on contractor side.

TNB and application will be around 4-5k. Not sure if you going to change the fuse box and other wiring. Yeah 10k is really not expensive

ok thank you...wanted to consider install solar panel for home and i was told for 6kW and above I need to have 3 phase wiring system. If added this RM10k+ cost just to convert to 3 phase...i think i'm gonna just drop the plan..upfront conversion cost already so high also...

If your property is within the last 10 years, most of it are 3 phase ready.

My curent place, if I remembered right during VP then, some units converted to 3phase for less than 2k. Maybe now higher.

Hi, I am at subang jaya, i wanted to install solar panel up to 9KW, so I have to change to 3 phases.

Electrician is quoting me Rm5K include helping me to install the 3 phases meter, extend the dbbox, apply tnb which require 2 months waiting max. Rm5k didnt include rm300 connection changes by tnb and didnt include security deposit.

My house is the last house in the section and has 4 tnb cables so electrician said doesn't require tnb to pull new cable from the pole.

Any idea if the price is reasonable?

Solar panel 9kW does not mean you will get 9kW output, the main item is the inverter. How many kW you have in mind?

Yes that is about right price.

7 aircon from phase 1, can’t use for phase 3.
Unless the aircon work with phase 3 like VRV or 8 HP and above , must work with phase 3.
Otherwise phase 1 can support up to 7 aircon.

I have a 12 kWp solar installation running on single phase. No problem. Peak feed is 10 KW +/-, TNB approved. So I would not worry about 9 kWp on a single phase.

actually 3 Phase will save alot electric bill compare to 1 phase?

my house normally only turn on 2 aircond at the night , 1 normal fridge , 1 normal topload washing machine and LED downlight

if changing to 3 phase will make huge electric saving price?

Its not really to save energy but more for a better electrical load management


According to tnb,
https://www.mytnb.com.my/business/get-elect...ade-electricity

WHEN TO CHANGE

You are advised to change from a single-phase supply to a 3-phase supply when your household electricity load exceeds 10kW or 50A. As a rule of thumb, if you have three (3) or more air conditioners in your home, you should upgrade to a 3-phase supply as it will increase stability and reliability of electricity supply.

do u mean have 3 aircond or more open at the same time? Because i have 3 aircond room (1hp x2 + 1.5hp x1 + 2hp Living room)

so basically weekend only will be turn on living room 2hp for about 3-4 hour only , and at the night time mostly 1-2 aircond will be turn on ....


very very rare need to turn on all 4 unit aircond at the same time....

in term of stability , mean if over use the power , fuse box will easy burn and will jump fuse box?

This post has been edited by chongkiatz: Jul 1 2024, 04:52 PM

Yes, over usage will lead to the fuse getting burnt.

Also good to upgrade to 3-phase if you are considering using an EV car with EV charger in the future, coupled with CCTV, alarm system, smart home etc. etc.