this is 2nd time I heard about 3 phase save money (in term of electric bill)? how it's possible? anyone care to explain?

No save money at all, can easily use more power accidentally and easily equals to lose more money yala

You have to see at a rich person view. They willing to pay for the consumption and the montly bill.

A reason to change 3P

For choosing between single phase or 3 phase depend on your HP use on your air cond + fridge + Water Heater.
If you use more then 3 air-cond with 1 hp then i think can go to around 5 unit.

If your house power usage is more then single phase supply then it will drain more power which will damage your home electric component in long usage.This happen due to unbalance/unstable power require for others electical component during overload power. Your DB will trip when the power overload according fuse that you use.

Thats why if you single phase bill is over RM200 when change into 3 phase will be cheaper because you component has enough power supply and wont drain power.

Do you have proof of "your home electric component in long usage"? & "Thats why if you single phase bill is over RM200 when change into 3 phase will be cheaper because you component has enough power supply and wont drain power."

Fused will be the first to blow / trip if it overuse. If you get under voltage supply from TNB, your fuse will blow even faster, because the current draw will be higher.

RM 200 usage is about 600 unit (KWatt usage per month), that equal to about 20units a day. If using only 8 hours peak, 20/8 = 2.5 unit average high per hour, that only take up to about 10 amps. Unless you use 1 hour 20 KWatt, than this you need to use 3 phase because you are drawing 84 Amps (highest single phase is 63 Amps)

FYI, my parent house, sometime we pay > 250 per month. Is still single phase.

This post has been edited by weikee: Mar 20 2012, 11:02 AM

I think alot of people still don't understand how to judge and need the 3phase.

Many are just kiasu and assume they are going to use alot of power. When bill come, sakit gigi.

Theorytical your calculation may seem support single phase.
In practical, do all your electric use and on at same time to cause power overload ?
If you has heavy power usage but not all use at same time, then single phase is enough for it.
My house got 3 fridges, 4 unit 1hp air cond and 1 unit 2.5hp air cond. On daylight we just on the fridge and at night
only 2~3 air cond will use. Sometime will cause electric trip. For average monthly bill is RM300+
Almost every 1 years+ need ask technician to come my house to check on compressor of air cond and fridge because it not function.
After that change into 3 phase, the electric bill gone down about 20%.
My fridge and air cond now no need always call technician to check within 2 years.

This post has been edited by ttleng: Mar 20 2012, 11:27 AM

TNB change my old single phase meter to new single phase meter, power usage seem lower too. It could be the meter too..

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Added on March 20, 2012, 11:37 amAh well, this is forum to discussion or exchange idea. We only give our idea, thought, and experience. At the end is still house owner decision.

I just find it irritating when people give information without data and fact, this can be very dangerous in some situation.

This post has been edited by weikee: Mar 20 2012, 11:37 AM

so you got 20% after changing to 3P..

it's still confusing.. Can't see any connection of lower bill when you appliances operate with enough amp.



Any electrical background can explain about this. Let's said my house use 60A (limit for 1P right?), for 10 hour. How this translate into lower bill under 3P than 1P.. Does operating near phase limit is more consuming than operate half the limit?

Anyway, to measure the total amp I can just use DIGITAL AC CLAMP outside the house right?

It is cause by the wiring that you overload it. You still can achieve lower bill by rewiring your house with a single phase. And limit your appliccance to 1 power point.

When your appliccance draw high watt, wire will heat up and give resistance to the voltage (voltage drop). That draw higher amp to run your applicance. And longer the distance wire, resistance is higher. Another is wire material. Use this fomula -> V / R =I

To counter this, Use bigger dia wire and plan your house wiring system properly. Some forunner here have some good wiring plan you might search back.

No one mention about the incoming cable from TNB, TNB usually have 4 cables run from one row of houses (3 Phase), and this supply > 63amps per phase. For longer row of houses you see one two supply end to end. If you have large and thick cable tap to one single phase you can actually run higher current too.

Agree with what you explain here. But if your wire have conceiled in wall and need hack ,reconceil seem troublesome else using casing rewire again.
Thats why before house renovation, plan well on which phase you needed. What type wiring you conceil. Think for long term.

A single phase 60A x 240v = 14.4Kwh. Base on your main fuse 60A. Assume you use full but limit 8hr/day and will cost you 14.4kwh x 8 x 365/12 = 3504kwh -> RM1500/mth. Do you use that much?

Blast your 5 aircon 1hp, 3fridge(1.5hp) and heater(3.2kw) consume you 3750kwh + 3375kwh + 3200kwh = 10.3kwh. Using 8hr average will cost you 10.3x8x365/12 = 2506kwh/mth - RM1059/mth. Do you use that much permonth?

This is only single phase.

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Added on March 20, 2012, 12:38 pmI will go back single pahse. Unless TNB said free upgrade 3phase for me.

What I do is just upgrade the wire and plan properlly. Saving is always in my mind and try to lower the bill as much as possible.

Not to think "going to use more in the future". Unless I strike TOTO.

This post has been edited by ozak: Mar 20 2012, 12:38 PM

As i mention, my bill for single phase was RM300+. Only 3 fridge was on 24 hrs, air-cond only at night and not fix 8 hrs maybe 2~3 hrs or sometime didn't on at all.

I m explain to you what single phase max can do. Without 3phase.

Does 3P make a different? Let's said I use 60A, then change to 3P still use 60A. Same wire, same load = same heat? Something still missing I believe. Just wanna make sure, I understand correctly what 3P can do and cannot do.. My facebook Taman full will this discussion so wanna give feedback to them also..

If you using Same wire, same load = same heat with the same point, no different. Cause just 1phase is wired to that point. The problem still remain there.

Let me give u illustration on that,
Imagine a train A pulling 1 passenger box which can carry 30 ppls.
While another train B pulling 3 passenger box which can carry 90 ppls with 30 passenger each box.

Now, if there is 60 ppls wanted to enter train A, then the box maybe fit for all 60 ppls but the situation will be crowded and will hot.

If that 60 ppls split and move to train B with 20 ppls each passenger box. Then it still normal situation .

If you load still below the limit of train A, then you can choose to enter train A. Else it will be train B.

weikee, after u change to new tnb meter, u feel the power usage become lower? But i feel meter turn faster than old meter wor.......my wife got observed everyday....she said power usage higher.....