Oh, I've finally come to accept that the house will probably be done in March or after.  I'll be ready to sell and get out of here about the time that its ready.  I'd seriously sell if I thought someone would buy my 90% completed dual voltage house without doors and windows. 

I'm not good with electrical stuff either.  Whole house transformer to me only means that its big and wired to outlets around the house.  7.5 kva isn't huge enough to run everything 110v in the house, but I think we'll be okay if we are careful not to run the dishwasher, electric dryer, and microwave at the same time.

From my layman's understanding of the electricity here, the wires are one hot 220v and one neutral as opposed to two 110v hots (like in the US?), which could be split.  I don't think it has anything to do with the breakers.  A hot wire of 220v can't be split into 110v. 

Something I should have added in my last post is that the two hot wires of 120v supplying the dryer outlet need to be on a double pole breaker so that they are out of phase.  I don't know anything technical about that, but its information I expect the electrician to know. 

Our house is finally almost finished.  I thought I had everything figured out about the electric dryer installation.  The electricity had to be run through a transformer so that the energy would be stepped down to 120v, and then use two hot wires of 120v to form the 220v needed for the heating element.  This is necessary because the electronics run off of 120v, and electricity here in SC is one hot wire of 220v.  Also it would need to be installed on a two pole breaker.  This is the information we got from out transformer maker in Floripa. 

The electrician came by today and we asked him about the electric dryer plug.  He said he think we might need three phase electricity for it to work.  We have biphasic energy where I live. 

Can anyone with some knowledge of electrical engineering help me out with this? 

I tried contacting LG today to help, but they said they can't help with the plug outlet installation / electrical specifics, only problems with the dryer.  They did give me a link to the service manual.

http://service.velaro.com/transfer/svc-dlex2501,dlgx2502.pdf  

Thanks for the reply.  Did you bring an electric dryer?  Do you have 1, 2, or 3 phase electricity?  I already have transformer for the house hooked up.  I really just need to know if two phase is a problem for the dryer.

My electrician and transformer maker have talked and they agree that I need a biphase transformer.  The one I bought for the house is monophase. 

So I'm going to need to buy another transformer for the dryer.  The transformer maker says I need a 7.5 kva transformer (R$900) just for the dryer because the manual says it needs a 30 amp plug.  I called LG and asked what the wattage of the dyer is and they say 1800 watts. 

I hate to spend an unneeded R$900 to get my dryer working if all I need is a 2000 watt transformer. 

My experience with installing a US electric dryer in Sao Jose dos Campos....for whatever it may be worth to all you guys.

After. much deliberation with a friend back in the states who is a industrial electrician, we determined that our 220 here is genuine 3-phase, unlike 220 in residential apps in the states, where it is monophase, a hybrid of 110 lines off the main panel. With 3-phase, there was no Neutral line in the house for the 110 circuitry (control board and drum motor). But the two legs (118 each in my case) were fine for powering the heater elements.

When I opened the cabinet on an exploratory mission, I was blessed to find a basic wiring diagram hidden inside from the factory. After several mark ups and emails of the diagram back and forth, we were able to isentify a point where we could split the 110 control/motor circuitry from the heater wiring.

At the end of the day, I scrapped the expensive pre-fabbed cable I brought along from the states. Two legs of the back terminal on the machine are wired directly into two legs of the homes 220-3. The third terminal on the back is wired to a 110v transformer I brought along and serves as Neutral. Finally, a fourth wire was was pulled from inside the machine and wired to the other side of the 110 transformer plug.

I need also to install a ground for safety. Two do this will require that I drill a hole in the floor and drive a ground rod in, as our older home here has no wiring for Terra.

Will be happy to pass along photos of my installation if they are of value to anyone.