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Renovations 3-phase wiring
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Singh_Kalan
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 May 8 2008, 10:08 AM
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QUOTE(nj922 @ May 8 2008, 09:48 AM) Hi, Anyone can advice me on what is 3-phase wiring and what should I do to apply the 3-phase wiring? how much is the cost? thanks in advance. 3phase are 415Vac supply (generally for industrial use). Typically there are 4 lines for 3 phase (R,Y,B) + N(neutral). For home user, the normal supply is 240Vac, so in order to get this supply from 3phase, u need to tap either 1 of the phase to neutral. Btw, why u need 3phase for home use??  |
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Singh_Kalan
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Aug 22 2008, 07:39 PM
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QUOTE(eksk @ Jun 12 2008, 04:48 PM) One thing good about 3 phase wiring is that each phase draws power from different line. Most of the times when my neighbour hood has a blackout, my house will still have electricity.  that is if only 1 phase are down (which are quite rare from my experience). If it's cause by substation breaker trip, then all phase down. The reason why TNB encourage domestic heavy user to switch to 3 phase is because of load imbalance (they wanna protect their main breaker from frequent trip and get screwed by domestic user)  Don't see any necessity to change to 3 phase unless they (TNB) pay or subsidies for it. They should pay for this since this is for their own good. In a residential area, each house electricity are distributed with different phase eg. Yours Red-Neutral, your neighbour may be Yellow-Neutral and the next neighbor Blue-Neutral and so on. When a group of houses eg Red phase are heavy user, this cause the 3 phase load distribution become unbalance. eg Red phase = 200A, Yellow phase = 50A, Blue phase 60A. This may resulting in frequent trip (especially at nite when most ppl are at home).  This post has been edited by Singh_Kalan: Jan 12 2009, 11:07 PM |
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Singh_Kalan
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Dec 2 2009, 12:02 AM
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QUOTE(kimyee73 @ Dec 31 2008, 11:03 AM) Here is my update thus far. The electrical contractor has replaced my ELCB and Main MCB with 3-phase version (EPS brand instead of Doepke), rewire for 3-phase and in fact removed 2 of my spare MCB to fit into the original box. They did not change the DB box. They also installed 2 additional cutout fuse at the meter panel. All that for rm850, I think it is a rip-off!! Call up the contractor again asking about the 2 missing MCB and missing Main MCB switch. The Main MCB is there but I could not locate the switch. I think it is hidden under the DB faceplate. She said she will ask another electrician to look into it. I also asked her why the ELCB only shows 63A? She said she applied for 63A and not 100A. I told her if I just need 63A I would not change to 3-phase as it make no difference. Again she said she will check with TNB if still can change to 100A. Called up TNB again asking about diff between 1-phase 63A and 3-phase 63A and was told that 3-phase is better, more stable etc. Not the answer that I want. I think there is no difference as both provides same current. Anyone have different opinion on this? Now back to waiting again. Actually there is a big different in term of power availability between 1 phase and 3 phase. A 63A 3 phase has about 45kW capacity while 63A 1 phase has only 15kW. 3 times the capacity, that's the different. Btw please check the incoming cable size or current carrying capacity b4 changing to a larger size ELCB. This post has been edited by Singh_Kalan: Dec 2 2009, 12:04 AM |
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