i trenched the whole way out to the drop-pole already and need to buy the cable to put in the conduit, but am running into huge costs of the cable (500 mcm is what voltage calculators tell me). Is there another way via step-up/down transformers to reduce the cable size thats cost effective? Also where do u buy this stuff? tks
kk plz dont answer if u are going to give a 'pay someone to do it' answer - the drop pole is where the power company drops their line from the transformer.
the meter is on the drop pole
pappy- why do u think that i am not 'legal' or going to 'do it the right way'? amazing how trained ppl are to not try to do anything themselves.
Thank you Lindner, that is the setup that i was hoping that was out there available and best fits my needs ( i live on a steep slope where overhead would have to run up my back yard, not cheap or pretty. not to mention that PG&E in california gives only 100ft of drop from their pole free then its $20 per foot for overhead.. )
Dude, you're hatin' it. There really is no simple, cheap solution to your problem. I agree with the guy saying to bring out the power company's planner and see what he says. Sometimes they can be hard to deal with, but that's their job. Also, setting a pole or two and running your high voltage overhead to get your xformer closer isn't a bad idea, but since you've already trenched the whole distance I'm going to assume that that isn't the route you wish to take.
I calculated your voltage drop @ 125A and came up 300kcmil copper. Also when you calculate for voltage drop you should use the load being served…so if you figure you'll never actually draw more than 90A you can use that in your calculations. Just remember if you draw more than that you'll start droppin' voltage.
Another option-and this is very unorthadox for a residential service- is to have the power company run 480 to your residence and then use a step down xformer. A 25kva is gonna run you about $1500 US but you'll be able to use 4/0 aluminum conductors from where your meter is now.
Electrical supply house deal in transformers and such or check with some of the industrial supply companies like Grainger.com.
I wish you luck, bro.