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Renovations 3-phase wiring

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weikee
post Jul 12 2011, 09:44 AM

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

hmm, 10KVA, that's lot of electricity.
weikee
post Jul 12 2011, 10:38 AM

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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.
weikee
post Jul 12 2011, 10:44 AM

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QUOTE(kiterackk1 @ Jul 12 2011, 10:41 AM)
Deposit is Rm 1k plus. Meter and the upgrade another 1 k plus. If you haveore than 6 air cond, better apply for it
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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 ohmy.gif
weikee
post Jul 12 2011, 11:13 AM

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- 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
weikee
post Jul 12 2011, 11:39 AM

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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.
weikee
post Jul 12 2011, 01:51 PM

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

You need to consider Water Heater, Fridge, and Electric Oven, or perhaps a super duper 3000watt Amplifier sound system.
weikee
post Jul 12 2011, 03:05 PM

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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?
weikee
post Nov 8 2011, 01:09 PM

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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
weikee
post Nov 8 2011, 01:56 PM

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QUOTE(pky @ Nov 8 2011, 01:48 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.
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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.
weikee
post Nov 8 2011, 10:48 PM

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Where got 6 use for lighting. At most 3 for most single DB box.
weikee
post Nov 9 2011, 11:21 AM

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QUOTE(tiensong @ Nov 9 2011, 11:01 AM)
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..
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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.
weikee
post Nov 9 2011, 01:13 PM

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QUOTE(kamion @ Nov 9 2011, 12:59 PM)
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. biggrin.gif I wasn't sure if I wanted to do it in the future.
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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.
weikee
post Nov 9 2011, 01:56 PM

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TNB recommend max 50A for single phase.

http://www.tnb.com.my/residential/manage-y...upply-type.html
weikee
post Nov 9 2011, 03:08 PM

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Yeah, just change the outside fuse, and also internal circuit breaker
weikee
post Dec 5 2011, 06:22 PM

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With recent rainy season, 25c is not much difference than outside temperate, sometime can go below 25c too. Your compressor even non inverter did not work that much. Try setting 21, compressor will on and off more frequent.
weikee
post Jan 5 2012, 02:47 PM

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Outside as in at gate or autogate pillar?
weikee
post Jan 10 2012, 10:40 AM

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QUOTE(ozak @ Jan 10 2012, 09:44 AM)
Why you guys want to change to 3phase when your applicance doesn't exceed 65A at 1 go use?

Does your bill cheaper?
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Make me wonder too.

My household equipment if fully switch on till take up about 16,000 Watt. But that if I switch it on. I doubt smile.gif Usually highest usage is about 8000 watt for short period of time.

Added on January 10, 2012, 10:41 amBTW, the fuse is rated much lower, think is 43Amps or 45Amps. Mine is on that number. Is 65Amp common for single phase?

This post has been edited by weikee: Jan 10 2012, 10:42 AM
weikee
post Jan 10 2012, 12:14 PM

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Hmm, That mean i got to replace my outdoor fused before i blow it up smile.gif
weikee
post Mar 13 2012, 11:55 AM

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QUOTE(exkaizen @ Mar 13 2012, 10:46 AM)
I don't know regarding phase, fius & electricity... how to check whether our we need 60A fius or change to 3 phase?

let say have 2 aircond (1hp each) & 1 aircond (2hp), 3 water heater, 2 42" LCD TV, 1 two door fridge, 1 microwave oven, 1 electrical cooking hub with hob & 500watt desktop
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You did not specify is a storage or instant water heater. Assume is Instant:

3 Water heater if you switch on concurrent already 3/4 the limit of 60 Amps fuse. 3600Watt x 3 = 10,800 WH, about 45 Amps.

3 A/C switch on concurrent , you ause up about 3600 WH, about 15Amps.

So if you switch on everything you mention above at the max at the same time, you burn the fuse.
weikee
post Mar 13 2012, 02:12 PM

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Another reason why people use 3 phase because they have 3 phase equipment like >= 4HP a/c. Welding machine..

Added on March 13, 2012, 2:14 pm
QUOTE(tomjason @ Mar 13 2012, 02:05 PM)
if your usage if high for safety reason go for 3 phase..if overload dangeorus..can cause fire...example..if your got 5 airconds and 4 water heater..and other..60Amps is not sufficient...if overload can cause fire..also overload your wiring...
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Sorry I don't agree. Unless your house got no MCB or fuse protection. Anything above the threshold it will burn the fused or trip the mcb. Unless of course the owner bypass the fused, and short the MCB.

This post has been edited by weikee: Mar 13 2012, 02:14 PM
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