OKay,,,,,the ONLY way you can get three phase low voltage secondary (like 240 3 phase) is if the HV Primary is also three phase and that means theres at least 3 (Delta) sometims 4 (Y) wires up on the HV utility primary.
A transformer can reduce voltage but it doesnt add or subtract phase i.e. single phase HV can be reduced to single phase LV, 3 phase HV = 3 phase LV or perhaps three legs of single phase.
If you see 3 or 4 wires up on the HV primary thats three phase but if you only see two thats single phase
You can still get three legs of single phase LV secondary from 3 phase HV primary which is why you may see 3 or 4 wires on the HV primary in a residential area. If its up there they can supply your home with single or 3 phase service but if only single phase is up there single phase is all you can get
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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