Maybe many people monthly bill are above 500

Yes, you are right in the sense of when you ON any appliances, the initial A can goes up to 6 times higher.

Modern circuit have made some improvement and some even put in current limiter this reducing the rushin current for startup motor. Even if it go up 6x, is only few seconds.

Yup, just a short while high peak, later it will goes back to the normal A.
That is why usually those contractor will ask the house owner try not to ON a few units of aircond at the same time.

The current rushing is not even over 1sec. Just 0.5 or less. The main fuse won't blow at all.

All this possibility, I have conduct experiment before.

Wonder how can the house owner switch on the same time? Even after power trip, the A/C auto on is also random timed, that was one of the reason the random switch on time was design.

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Added on November 19, 2012, 1:47 pmAh well, maybe we have many well to do home owner, target to have lots of high HP a/c switch on, and few hundreds lights switch on daily. Ok to pay for TNB.

Maybe I should buy TNB share already

This post has been edited by weikee: Nov 19 2012, 01:47 PM

Fast, go buy the share.

I heard the rate will increase next yrs. TNB ceo and the petronas ceo have no idea how to absorb the extra subsidy anymore. The raw material like gas and coal is already increase.

Someone told me the actual rate will be about RM 0.5 per kw, could be higher. All thanks to the IPP "special lock price" to TNB, and over supply. Ah well is only speculation.

But do expect to go up North after 13GE.

It is possible i think, just the chance is super slim.

It is possible if 2 persons in the same house ON the aircond at the same timing. But as i mentioned earlier the chance is super slim.

Or this is one of the reason for contractor to excuse themself if something wrong happened?

When testing my house wiring, i switch on all my 6 units of a/c + 2 water heater, My ELCB did not trip, only my main fused beside the meter blow after about 10mins of used. That is because the fused was rated 40+ amps (think it come from 3 phases) free from my electrician. Change it back to 60Amps, that should allow me to handle up to 14,440 watt. More than my 6 a/c + 2 heater.

I always play with this motor or heater and conduct actual test of the ampere running. With the instrument checking, I can see how much the current rushing and how fast it will drop. Even I can put in the same amp fuse without blow it in short time.

Don't worry about the rushing current or bla bla bla. Even if the single phase running max amp, I can simply replace the fuse with a bigger 1.

From the way it sounds like paying extra to get a 3 phase wiring is not worth while huh.
Unless the no of appliances is really huge in a house.

Is not sound, is actually not worth it if your appliance are not power hunger.

This post has been edited by weikee: Nov 19 2012, 09:26 PM

Any second opinion here?

i 100% agree with weikee - no reason for any "sound mind" to say differently. unless you need it (which in most cases you wont) there is absolutely no need for 3-phases.

Then we confirm here, 3 phases is not necessary unless under 'special' circumstances.

If my monthly bill is about RM250 with total usage about ~600KwH. Can somebody help me calculate the current load on the single phase?

The proper way is to check your whole house electrical applicance wattage using. Than total up the wattage. Some not using everydayo, minus out.

Weikee already state that as long as it doesn't over 14,400watt total usage, you don't neeed change to 3phase.

It can't be calculate in this way.

You need a current meter/ thong meter to check the actual usage.

weikee, is this correct?