Hello fellow folks of the electrical world, glad to stumble upon this site...this is my first post so bear with me...
I am currently working on a project (residential) that has been my most challenging up to date. A 2600 sqft. home is being built a top a ridge where the utility main service is located 390ft. from my loadcenter in the house. The service is rated at 200A and PG&E (utility company) brought the service as close as their engineerng would permit. From the main, I am feeding 180ft to a generator/pumphouse to an external subpanel and then the final 210ft. to the house's subpanel. There will be zero deviation in the trenching. Basically from point A-B-C.
I Propose to bring the entirety of the Ampacity of the main to the pumphouse (200A), and then supply the house with 150A of ampacity..When I did the calculations, I came up with 250MCM CU THHN would carry 150A for 390ft. @ an allowable 2.99% voltage drop...
My questions are:
-Is that conductor size appropriate for the desired ampacity/length of run?
-Is there a more economical and code compliant way to achieve these specs (parallelled aluminum conductors etc..)
-Should I be concerned with the fact that the utility maxxed out their service distance to begin with??
Thanks in advance for any input...
Don
I am currently working on a project (residential) that has been my most challenging up to date. A 2600 sqft. home is being built a top a ridge where the utility main service is located 390ft. from my loadcenter in the house. The service is rated at 200A and PG&E (utility company) brought the service as close as their engineerng would permit. From the main, I am feeding 180ft to a generator/pumphouse to an external subpanel and then the final 210ft. to the house's subpanel. There will be zero deviation in the trenching. Basically from point A-B-C.
I Propose to bring the entirety of the Ampacity of the main to the pumphouse (200A), and then supply the house with 150A of ampacity..When I did the calculations, I came up with 250MCM CU THHN would carry 150A for 390ft. @ an allowable 2.99% voltage drop...
My questions are:
-Is that conductor size appropriate for the desired ampacity/length of run?
-Is there a more economical and code compliant way to achieve these specs (parallelled aluminum conductors etc..)
-Should I be concerned with the fact that the utility maxxed out their service distance to begin with??
Thanks in advance for any input...
Don
