The cost of the meter I forget but also you have to upgrade some of the cables and fuses and so on inside the house to make it safe, also the cables leading to the house from the meter have to be a lot more heavy duty! I think the meter only cost 25000 but please don’t quote me on that .If your wife calls the local government electrical company they will know. They say your electric bills will be less costly using heavy duty faze. Im not an expert on 3 faze but I know it comes in different sizes Single double and triple. I guess you will be using single ,if you went with triple you would have a big transformer put outside your house and this can cost around 100.000 if not more .
There is nothing to ''upgrade'' in my case, the house is already fitted with a 3 phase Load Centre (Square D 30 way) from scratch. I have so far used 17 circuits internally, with 13 remaining for outside at the Pool etc, easily used up.
Supply outside in the road as shown in pics is 220v 3-Phase just like most villages in Thailand - Leading down the main road we have 4 wires, 3 lives and a neutral. The big transformer you mention is further up the lane and does the whole village, stepping down from the High Voltage Main Supply to 220 for domestic. In the lane at the back we only have 2 wires on the Supply Poles meaning that 3-phase is not available there.
Most houses have 220v Single phase - ie they pick up one live and the neutral from the 4 wire supply, with successive houses picking up different lives and the same neutral down the road so as to spread the load across the phases equally and reduce voltage drops etc. Single phase 220 is available in 5 (15), 15 (45) and 30 (100) with the first figure being the max continuous Amp rating and the second being the peak.
I have merely ''picked up'' all three lives and the neutral down from the supply in the road, thereby giving me a ''four wire'' three-phase supply to my place.
This is often a ''commercial'' application however as I am building a large place and intend to put in a Pool etc I feel that the single-phase 220v supply will possibly be a bit overstretched at max available 30 amps. My four aircons will draw more than 25 if all are running, so do the maths - so at single phase 220v, the max I can draw is 6600 Watts (6.6KW) continuously, although the system will tend to cope with more.
I have gone for a 3-phase Four Wire supply with the minimum, non-commercial meter running at 3 x 220v @ 15 Amps Continuous, which gives me a 45 Amp load to play with and as it is spread over 3 phases, less voltage drops or spikes due to others switching in and out down the road.
Wires are all in place as is the Load Centre in the House, now all I need is the meter. Reputed to cost 18-20K thb, but i was just wondering if anyone knew...I will find out very shortly.
Now do you understand...take a look at the poles outside your place next time, then you may see what I mean by all this....lol.
Cheers, MH