Whith 3-Phases, you should be adding more MCB, Unless your house is already pre-wire with all the load individually.



This post has been edited by weikee: Nov 8 2011, 01:12 PM

As mentioned earlier, depends on why TS need to upgrade to 3 phase. If TS introducing new load, say, 6 additional A/C, 3 refrigerator, extra compound lighting etc. Budget wise, TS can just assign the new load to the 2 new phases, while the 3rd phase supply to the existing DB, of cause, not the proper way of work, but just to meet the budget and minimize damage.

If just to upgrade the existing electrical system, since TS planning to have a 3 phase, i guess, TS existing DB already have quite a number of outgoing circuit and MCBs, so can just divide them into 3 groups at the DB.

Bro weikee, if upgrade to 3-phase, just have to change the incomming breaker and protection device to 3 phase. Quantity of outgoing MCB can remain the same, depends on TS needs.

Existing house using 1 phase maybe only have 15 MCB, or less. You put 3 phases, how you want to share the load? You need extra load for 3 phases. That mean extra MCB, extra wiring, extra socket.

Must well add the internal first, only do the external. If doing renovation just pull a thick 4 core from outside to inside will do.

If 15 way SPN DB, assuming 6 used for lighting and 6 used for power, the rest are spare. Upgrade the Incomer MCB to 4P, Protection Device to TPN, put 2 MCB for lighting, 2 MCB for power, 1 spare on each phase. This is, if TS just want to upgrade the electrical system and not add additional load to the system, so no need extra MCB nor socket.

Submain cable definitely have to lay new. Multicore or single, depends on DB and TNB meter location.

Where got 6 use for lighting. At most 3 for most single DB box.

So confusing....

Initially I plan to use 3 phase when re-wring my whole house but at the end no budget, use 1 phase...

I hope I can change to 3 phase in the future without major changes..

I'll advice first floor independent DB box, ground floor one independent DB box. Pull 4 core thick cable from front gate pillar to your DB box for future upgrade.

Electrician offered to pull the cable under ground for future 3 phase if needed, but then he said must install some sort of DB at the gate. He quoted a few thousands just to do that. I told him no need. Next time just pull in above and fly over. I wasn't sure if I wanted to do it in the future.

Few Thousand? that is expensive. Thousand plus is ok, unless your gate to the DB is like 50feets away. These cable are expensive, and do take note not all location TNB allow you to use the existing cable to be 3 phase. Depend how how the current load, if the load is already near max they will ask you get direct from the utility pole, and it will terminate to your front gate. unless you don't mind 4 cable come in between your house from the pole.

Everything already done...I don't know whether they pull 4 core thick cable to my DB box or not....I believe they don't...

haiz...leave the headache in future....now think too much also no use..

What is the max current for 1phase?

TNB recommend max 50A for single phase.

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

I upgrade to 60A from the list the developer give for option upgrade.

But since my electrical still below 10kw, better stay at 1phase.

Yeah, just change the outside fuse, and also internal circuit breaker

btw do all new house 3-phrase ready? meaning already pre-cabled underground from pole to outside meter? how much does its cose to convert single phrase to 3 phrase. i read about the additional charges for cable to main meter fuse.

another one, if i apply for 3-phrase. theirs assigned will come check our house wiring and quote us right? to do or not to do we still can decide right?

This post has been edited by KIntos: Nov 9 2011, 03:20 PM

Not all houses are 3-phase ready. To convert from single phase to 3 phase.

Your side
1) To change existing single phase meter panel to three phase (if u r wondering what is meter panel, its the box where your meter mounts on)
2) To change / upgrade the main cables from meter panel from single phase to three phase (from 2 core cable to 4 core cable)
3) To upgrade ur DB from single phase to three phase ( the main switch/mccb and elcb/rccb need to change to 4 pole)

TNB side

1)Engage licensed electrician to liase with TNB to upgrade the incoming cable and meter to three phase

hi bro. so mean i will get charges for the TNB side as well right for the upgrading the incoming cable? i tot all new houses is 3 phrase ready nowadays.

hmm.. how much do its cost if we wanna upgrade roughly? my side i think i need to fork out like rm1k++ not include the TNB side.

Yes you will be charged by TNB. If double storey houses mostly is 3 phase ready nowadays, depends on the design.

For costing it varies according to the cable length and the amount of work required.

Just out of curiosity...the tariff rates are the same for single phase and 3 phase?

Yes tariff is the same ... refer http://www.tnb.com.my/tnb/residential/pric...riff-rates.html for more details.