I heard the contractor said that 3 phase will save more electricity.. is it true?

the other advantage i heard is that if your area is blackout your house will still be lighted up as the current will be drawn from another 'line'...

one of the contractor said because 3 phase can load more in one circuit, like a bus, can bring more people at one round compare to the car, so save electricity.......

pening @@

sorry because of my poor english.
some ppl they may have misunderstand something.
if u using a 2.5hp or more than that air-con, pls choose any 3-phase type air-con,more efficensy n save money.some ppl they though their house is 3-phase,than they go n buy a 2.5hp single-phase air-con will save money,thats wrong. u need to c the eer value, some product if even u install an 1hp + 1.5hp = 2.5hp , the electricity more saving than the 2.5hp 1phase, n if u can ,install an 2.5hp 3phases type u can get the more eer value.
y ppl say that 3 phase wiring is more saving form 1 phase?the waste of energy from wire heat
first ,u have to determine how is the maximum amp of ur house will use?..mostly electric appl will show at behind sticker. add up all.
if a max of 60A , and ur house is wiring with 65A wiring, n sometime u feel the wiring will get a bit warm or hot, that the part thats waste energy, so, use an 100A type wiring will save them.always remember, any part of wiring or switch or mcb,elcb,rcb ,fuse bla bla, that all are warm,hot are adnormal, n wasting energy, the cause was:
1.wrong amp rating,wire, mcb,elcb,fuse bla bla.
2. connector connection not tie enough.
3. short circuit bc of mice bit,moist.

so if a 100A of max how?(is that ur house is a factory?).. apply 3phase to dist them.

every house is 3phase ready(even 100years ago), unless the contractor using only a main wire pull from room1 to roon N. bc most of our nation resident using 3phase for dist current only, but not using 3 phase appliance..

sorry about my language.
wat i mean 3phase in our resident house is not actually with 3phase wiring,it only reach until the Db box. actual 3p wiring for appliances had to have at lease 4 wire (r,s,t,ground),sometime it add 1 more (r,s,t,n,ground),not like 3wire(L,g,n).
eg.acson or york cassette type 4hp.
eg.ceiling type or concealed type
mostly they install at living room.

3phase 4hp, n 1phase 4hp, witch one current using more ?1phase right? so the current flow more n generate heat or lost energy because of resistance. btw,yup, its not primary,but second . so conclosion, 3phase save more with 3phase appliances.

"About the energy loss via resistance, I am not too sure about that."
resistance in the wire. most contractor cone ppl with the low quality n small diameter wire, it increase the resistance. cause it generate heat, waste the energy n make the wire life shorter. Or , the user didnt mention to the contractor, after that they use it with high current appliances like water boiler, high power entertainment set, laser printer, hair dryer and etc. P.S. notebook consume very low power only.

for a small family (i' mean 2 kids and your the other half) it really serves no purpose..except for one advantage whereby when your area is trip , houses with 3-phase wiring may still draw current from other source and light up your house! how cool eh? So is a 'cool factor too!

I think the 3 phase thingy is a only 'fear factor' and will not burn the house down..
True or not? if overload..it will trip...just an inconvenience.
BUT the chance of tripping is slim...unless you are running a hotel in the house.

also preventive measures of tripping like

buy aircond invertor type- less current needed
buy AAA type appliances
switch on air-con not all at once and not all at 16 degree..

correct or not..?

my house have 5 aircon and 2heaters, but then we still using single phase only. i dun think such few electrical items will need to use 3-phase.
btw, hows the 3phase wall socket?? is it all sockets in ur house been changed to commando plug socket??

---

Added on November 3, 2012, 9:10 pm
so how is the wall socket looks like?? is all of the socket have to change to commando plug wall socket??

Is on the TNB application form on the requirement.
And insurance company will use this form and fire department's report to decide pay or not pay in case of fire.
Also, I do know that with single phase I can run 5-6 air conds without problem but when something happens I don't want insurance company have an excuse to deny a claim.

You are right, but again TNB already stated the guideline we "should" upgrade to 3 phase once we exceeding 3 air conds.
Your calculation are assuming that it is good quality of copper wire being used. It not even taking in to account of the qaulity, length and efficiency of the wire. Where's the heat generated calculation?
In some sense indeed we can't overload a single phase, but we can overload the wire which later overload the main fuse.
For sure insurance company never stated the rule on this as they release the claim's payment based on official report by government. Have you ever claim insurance before? The company need 1 single word only to deny a claim.

But will using 3 phase makes our bill cheaper? I doubt so, since the meter are digital and no other independent party can verify that. 

Thank you supersound for the advice. When i say 3 phase ready it means that the tnb meter is 3 phase ready but i think the wiring  in the house is single. Apparently i have to redo due to faulty and horrible wiring job done during renovation.

The question now, i got some feedback from electrician that i have to have 3 phase wiring still otherwise it wont be safe. Is that true? Of course it comes back to costing, my impression 3 phase would be way much expensive compared to single. Any advice? Thank you sir.