dear all experts here, please give me some advise...

i am planning to upgrade my house electricity supply from 1 phase to 3 phase, so my questions are:

1. it is really needed ?
2. what is the total cost involve? TNB + contractor.


thank you for your advise.

IT'S DEPEND ON YOUR HOUSE EQUIPMENT TOTAL LOAD.........

not sure abt the cost, but its good to have 3phase.
you can seperate your load - one for downstairs, one for upstairs, and one for kitchen.
usually blackout occur for one phase only (not sure if its true in semenanjung)

If your load is > 10KVA at any one time, you better get the 3 Phase.

hmm, 10KVA, that's lot of electricity.

thanks for u guys reply...so may i know what is the total cost involve?

thank you

TNB, around 4 - 5k, than you need to do your house wiring assuming redo all, that will be around 8k for entire double story. So easily 15k on the rough estimate.

How about new Earth? That also few hundreds.

Deposit is Rm 1k plus. Meter and the upgrade another 1 k plus. If you haveore than 6 air cond, better apply for it

Where got so cheap, i relocate my single phase meter already cost me 1.3k direct from TNB. Than this Puan ask me why not do 3 Phase, top up few Ks only. I was like

errr... why do one need to redo the house wiring for 3 phase supply?
does 3 phase works on different type of wiring or something?
thanks.

- Single phase using 2 wires
- 3 phase using 4 wires (Red, Yellow Blue, + Return)


If you don't indent to run 3 Phased equipments (e.g. 4HP a/c, 5KVA Oven ), all equipments are running on 240v only.

and

The house have the wall socket run independent without looping, And all high load (e.g. WH, AC, OVEN) points are independent (direct to MCB without looping). Than technically you can just pull in the 4 new wires, distribute the load on other phase.

Or maybe you have another DB box on 1st floor, use one phase for first floor DB, ground floor share out the 2 phase between load.

This post has been edited by weikee: Jul 12 2011, 11:13 AM

I thought if you need more than the amp allocated such as 60amp per household, then, you will need 3 phase wiring? Please help

Yes, but i think anything above 10KVA (about 45 amps) is better to go with 3 phase provided your house wiring support it.

If you have a looping socket, max it take is 15 amps in total. Don't overload else you risk of catching fire.

Wow, now many double story house owner so well to do. Can take up load of 40Amps.

How much is a load of 40amp, I can't imagine it? Like 6 a/c operating simultaneously/at the same time?

6 a/c of 1hp, is about 30amps in running. But if you start all A/C at the same time you got problem

You need to consider Water Heater, Fridge, and Electric Oven, or perhaps a super duper 3000watt Amplifier sound system.

My experience:
- upgraded 3 yrs ago for rm3k+
- 2.5 terrace w 5 aircons
- tnb bill reduced ~10%
Something to do with single phase overload will cause higher tnb bill.

Anyone an electrician can explain better?

http://www.tnb.com.my/residential/manage-y...upply-type.html

The advice recommend if you wish to change to 3P.

I never know upgrade to 3Phase can reduce the bill, maybe the old meter is faulty?

Can I upgrade to 3-phase without rewiring my whole house wiring? I am considering to upgrade in future when budget is allowed..

How old is your house? I think you can do it, but have to balance the load on the different phases only. From what I understand, three phase come in, then you tap off supply to different parts of the house from different phases. When you tap off, then there's no difference already. (But have to wait for bro weikee to confirm la. He sounds like expert.)

why do you need a 3-phase system? Are you introducing new load to the existing electrical system?

If introducing new load, just maintain the old connection, distribute the new load to the new phases.

Rewiring the whoel house might not be necessary, all depends on how your load is currently distributed, say if you have 6 MCBs occupied, just spearate the 6 into 2 per phase. Work only needed at DB, no need to work on the final circuit.

Thanks....