Browse Forums Building A New House 1 Sep 25, 2009 11:29 pm Can someone please tell me what the difference is between single phase power and 3 phase power? The pros/cons? Where 3 phase is needed? The cost difference? Thanks Re: single phase and 3 phase power 2Sep 25, 2009 11:58 pm I dont know a lot, but I was quoted $660 for 3 phase and got charged $1500, there are many threads going around (use the search funcion) and the prices vary alot. 3 phase is better for some airconditioners, but in reality you can get a really great single phase air conditioner now. If I had to do again I would not get 3 phase. I also believe if there is a power failure, the 3 phase may not get turned off, just the single phase. But not really sure about that. Re: single phase and 3 phase power 3Sep 26, 2009 12:13 am 3 phase is good for load sharing. you can spread the load over 3 phases therefore can use smaller cable smaller breakers etc Or the other way, it will allow you to install more. buildingwithhamra I also believe if there is a power failure, the 3 phase may not get turned off, just the single phase. But not really sure about that. sort of ......depends on fault and how your board is wired. Re: single phase and 3 phase power 4Mar 13, 2012 3:01 pm i have an induction stove top, and i cannot put more than one section onto powerboost at one time, it will drop the power back. is this a result of not enough amps being run to the appliance, or to do with too much on the circuit and only having single phase instead of 3 phase. btw we paid for and was to get 3 phase, but only single was installed. Is there any benefit in having the 3 phase installed now? If not, what credit should we have received back for the difference. Re: single phase and 3 phase power 5Mar 13, 2012 3:12 pm Some inductions tops may be designed like this. I would be checking the maximum amps this device draws and ensuring the appropriate cable thickness and circuit breaker has been installed. Re: single phase and 3 phase power 6Mar 13, 2012 3:21 pm mydreamhome i have an induction stove top, and i cannot put more than one section onto powerboost at one time, it will drop the power back. is this a result of not enough amps being run to the appliance, or to do with too much on the circuit and only having single phase instead of 3 phase. btw we paid for and was to get 3 phase, but only single was installed. Is there any benefit in having the 3 phase installed now? If not, what credit should we have received back for the difference. If you paid for 3 phase wiring(generally they just run the 3phase power cable into your board) then you order additional meters and circuits to spread the load around. An electrician will know what to do. Building with Jandson Homes - Eclipse 18. http://adgnetworks.blogspot.com/ Re: single phase and 3 phase power 7Mar 13, 2012 11:23 pm 3 phase is needed when * the maximum demand on your home is looking to exceed the allowable amp amount provided by the electrical distributor on a single phase cable.. i.e. your distributor may allow 40 amps per phase on a underground pit installation.. but your house might have a maximmum demand of 50 amps... therefore you would need to go 2 phase or 3 phase... or a larger cable ( but read below ) * 3 phase is an easier and cheaper option than running a HUGE single phase cable to the home.. <-- this is again governed by the above statement because there is a maximum amount of amps you can have for your home when there is an underground/pit style insallation... this is basically a stupid statement on my behalf because no one runs a MASSSIVE single phase cable to overcome a large home installation.. infact i shouldnt have mentioned it.. * you have appliances being installed that require 3-phase.. ie a welder, air compressor, air con etc etc so basically there are no advantages to running 3phase.. the only reason its needed is to provide power to a home that has a larger amp requirement or specific installed 3 phase equipment... THATS ALL. Dont get it installed just for the hell of it.. it costs triple the amount of single phase... i.e. 3 cables as apposed to 1, a 3phase circuit breaker for the main switch etc etc etc etc... if fact i know of a guy that only installed it because it sounded cool... hope that helped Electrical - Automation - Smart wiring - New homes - Commercial - Data cabling] 1300 050 315 www.cenemelectrical.com.au www.facebook.com/cenemelectrical Re: single phase and 3 phase power 8Mar 13, 2012 11:55 pm Our building tender includes 3 phase as standard (if available). I'm pretty sure they run ducted air off a separate phase. Does that make sense? single phase and 3 phase power 9Mar 14, 2012 1:38 am I read somewhere (probably on H1) that, I you ever intend to buy an electric car, you will need to have 3 phase power for the recharging station. I thought this was interesting as I want my next car to be electric.... You know, when they can travel further than 100kms on a single charge, and are less than $50k, I'll buy one Re: single phase and 3 phase power 10Mar 14, 2012 7:51 am I got 3 phase because it sounded cool. Maybe it will future proof the house? 13-08 Moved in 13-05 Build restart 13-04 VMIA compensation 12-08 Builder liquidation 12-03 Fixing 11-12 Lockup 11-11 Frame 11-09 Slab 11-09 Start 11-07 Contract 10-11 2K deposit 10-06 Titled land Re: single phase and 3 phase power 11Mar 14, 2012 2:43 pm it doesnt future proof anything... its all to do with power draw etc etc... you dont run an aircon on its own off a seperate phase.. it would make all the loads unbalanced.. as i stated 3 phase is to accomodate specific appliances that require it, and powerdraw.. nothing more.. Electrical - Automation - Smart wiring - New homes - Commercial - Data cabling] 1300 050 315 www.cenemelectrical.com.au www.facebook.com/cenemelectrical Re: single phase and 3 phase power 12Mar 14, 2012 5:27 pm The induction cooktop specified it needed 32amps run to it. The builder attempted to charge us more as this was an extra over the standard 10amps. When indicated an induction has always been specified, he said that the model we had chosen was not a standard, and that he'd run 20 amps to his, and that he'd contact the electrician and make sure he wasn't "going overboard". I have no idea what was installed 10, 20 or 32, but we cannot put more than one section on max power at a time. Would this have to do with the amps run? In relation to the phase, in our tender a 3 phase was included, but we only a single phase was done. We have had issues with other electrical work being incomplete and this is part of it. Does only having single phase impact on the induction? If not, then it doesn't sou d like we need 3 phase, but given that it's more expensive, we then should have received a credit for this - but for how much I have no idea. Thanks for your replies so far....I am completely lost with all of this so thank you for your patience with me Re: single phase and 3 phase power 13Mar 15, 2012 12:05 am Apart from the extra power, another reason for 3 phase is smoother power delivery as the alternating current waves from the 3 lines are out of phase (sync), hence the name, and thus sort of "fill in the gaps" reducing the depths of the peaks and troughs of the waves. This is why 3 phase air conditioners dont need soft starters. In a residential setting though its usually just for extra power for big aircons, welders, pool pumps etc. These have to be specially wired up though. What normally happens is they split the house wiring circuits for power points etc across the 3 phases so that you are still just running on a single phase for everything else. This is why powerpoint based networking and intercom devices say the are not compatible with 3 phase. Technically they will work but only if both ends happen to be on the same phase circuit and typically you can only find that out by trial and error. In regards to the cooktop, I would not expect 3 phase unless it is commercial grade (which is perhaps less unusual these days). I wouldnt have thought that any sparkie worth his salt would wire up a 3 phase device to single phase. Re: single phase and 3 phase power 14Mar 16, 2012 12:17 pm We will be getting 3 phase as we intend of having an outdoor spa, ducted reverse air conditioner and our house is going to be big so to run all of this with the normal appliances we will require 3 phase power to handle the load. Re: single phase and 3 phase power 15Mar 16, 2012 1:18 pm NatsyPatsy78 We will be getting 3 phase as we intend of having an outdoor spa, ducted reverse air conditioner and our house is going to be big so to run all of this with the normal appliances we will require 3 phase power to handle the load. Hope you dont mind paying the big bills Re: single phase and 3 phase power 16Mar 18, 2012 10:28 pm B STAR NatsyPatsy78 We will be getting 3 phase as we intend of having an outdoor spa, ducted reverse air conditioner and our house is going to be big so to run all of this with the normal appliances we will require 3 phase power to handle the load. Hope you dont mind paying the big bills Yes I know even with the solar panels we are going to put in it is going to be expensive! As we are going to be within walking distance from the beach I'm hoping the sea breeze will help during summer! 1 51263 Hello All 🙂 We are planning to start our journey of construction our first home. 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