100 to 600AMP buildings services 240/120 single phase and 208/120 3 phase could be fed from a single utility pole mounted transformer?

[Cartoon1]

Typically, and correct me if I'm wrong. 100 to 600AMP buildings services 240/120 single phase and 208/120 3 phase could be fed from a single utility pole mounted transformer. And anything above that you would need typically a pad mounted transformer. Is that generally correct? Thank you

 

[LarryFine]

Well, sorta correct. 208/120 3ph requires three pole-mounts.

I'm not sure about each company's thresholds. 1ph and 3ph may have different levels.

 

[kwired]

It comes down to whether or not a POCO wishes to mount unit(s) over certain weight on certain sized poles and/or wish to do additional construction to handle larger sized units, like a platform on multiple poles or something of that nature vs using a pad mount unit or even using open units within some enclosure at grade level.

Rural POCO here typically will not hang over 3 50 kVA units on a pole for three phase banks, or over a single 100 kVA unit on a pole for a single phase supply. Have seen some three phase in single units, but most are older and get replaced with a bank of three units if needing replaced.

 

[synchro]

The manufacturer at the link below offers pole mounted transformers up to 1000 kVa single phase and 500 kVA 3-phase. Their 3-phase units are either "triplex" with three individual single phase transformers inside, or with two single phase T-connected transformers inside. As mentioned above, the POCO may impose significantly lower limits on the kVA of pole mounted units than what's available.

https://powerpartners-usa.com/wp-content/uploads/2021/02/transformer_brochure.pdf

 

[Cartoon1]

It comes down to whether or not a POCO wishes to mount unit(s) over certain weight on certain sized poles and/or wish to do additional construction to handle larger sized units, like a platform on multiple poles or something of that nature vs using a pad mount unit or even using open units within some enclosure at grade level.

Rural POCO here typically will not hang over 3 50 kVA units on a pole for three phase banks, or over a single 100 kVA unit on a pole for a single phase supply. Have seen some three phase in single units, but most are older and get replaced with a bank of three units if needing replaced

Oh okay, did not know that. I learned something new today. Thank you!!

 

[Cartoon1]

The manufacturer at the link below offers pole mounted transformers up to 1000 kVa single phase and 500 kVA 3-phase. Their 3-phase units are either "triplex" with three individual single phase transformers inside, or with two single phase T-connected transformers inside. As mentioned above, the POCO may impose significantly lower limits on the kVA of pole mounted units than what's available.

https://powerpartners-usa.com/wp-content/uploads/2021/02/transformer_brochure.pdf

Thank you! great information source.

 

[GoldDigger]

Not sure whether you were implying this in your original post, but if you have three phase 208Y/120 from three transformers or a single three-core transformer, you will not be able to also get 120/240 from that same bank.
The only common provision of both three phase and double-ended single phase would be a high leg delta.

 

[Cartoon1]

Not sure whether you were implying this in your original post, but if you have three phase 208Y/120 from three transformers or a single three-core transformer, you will not be able to also get 120/240 from that same bank.
The only common provision of both three phase and double-ended single phase would be a high leg delta.

No, i meant different banks. Sorry i wasn't very clear in my post. Thank you!!