what type transformer

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GerryB

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Location
woodbridge, ct. USA
A friend is doing an 800 amp service, 12 unit apt bld. POCO has single phase in the area. He has to come from the pole with 200 amps underground to the transformer then he ran 500 kcm parallel to the meter bank. What is this transformer called, just a boost type. I think they (POCO) are worried about the load in the area. So it is a single phase 800 amp service, single phase at the street. my friend said they didn't want to go overhead for 800 amps.
 
GerryB said:
A friend is doing an 800 amp service, 12 unit apt bld. POCO has single phase in the area. He has to come from the pole with 200 amps underground to the transformer then he ran 500 kcm parallel to the meter bank. What is this transformer called, just a boost type. I think they (POCO) are worried about the load in the area. So it is a single phase 800 amp service, single phase at the street. my friend said they didn't want to go overhead for 800 amps.
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I dont really understand the layout at all. To give you advice, we would need to know what portions are secondary and primary, the service voltage, if this transformer you speak of is utility or customer owned, and where the service point is.

600-800 amps is a common cutoff for overhead services around here.
 
My space bar still does not work in reply, but the transformer is owned by the customer I'm pretty sure. Two 2" conduits (one is a spare) from the pole then under the sidewalk to the transformer, two 4" conduits another 20' to the meter bank. 120/240 single phase all the way, pole to tranny and through to meter bank. I think of transformers changing the voltage or phasing but here I am trying to understand how this transformer increases amperage, if that is what it is doing.
 
GerryB said:
My space bar still does not work in reply, but the transformer is owned by the customer I'm pretty sure. Two 2" conduits (one is a spare) from the pole then under the sidewalk to the transformer, two 4" conduits another 20' to the meter bank. 120/240 single phase all the way, pole to tranny and through to meter bank. I think of transformers changing the voltage or phasing but here I am trying to understand how this transformer increases amperage, if that is what it is doing.
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Here is what I think.

It is not 120/240 single phase all the way.

It is somewhere between 4,000 to 14,000 volts from the pole to the transformer which converts it to 120/240

The only way to get more current out than you put in is to put in more voltage than is going out.
 
I also think your description is wrong. Another possibility is that you have a CT cabinet, junction box, etc and not a transformer, and the difference in size on each side of it is because different rules apply on the utility side.
 
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