Dr Dave
Platinum Member
I like your cabinets, and that is a great looking front door! :thumbsup:
That is one seriously heavyweight power cable :-0 How many kilowatts do you think you'll ever get the need for ?
It's not the kilowatts. I had to upgrade from 4/0 due to the 160' distance from the utility connection. They required I upgrade due to voltage drop beyond the typical 3%. I asked the inspector why I had to use 250 MCM and the 125' utility lead from the transformer was about a 2/0. He said that the utility uses steel, not aluminum, and does not incur the losses like aluminum.
:laughing:That is about the funniest thing I have ever heard. Steel is a far worse conductor than aluminum. I have never heard of steel being used for electrical wire. If that is what he actually said, he is either clueless or making stuff up. Now the utilities will use cables with names like ACSR (aluminum conductor/steel reinforcement) to handle the stresses of long spans on poles, but note the name indicating that alum is the conductor...
I believe the reality is simply that the utility gets to operate under a different section of the code up to the meter, so they can get away with things you cannot on the house side of the meter... I also don't think you really needed to upsize for 160' run. I've been all through the calculations for my house, and I will be going with 250MCM for my run , but it is another 100' longer than yours. I just ran the calc for 160' and it gives a 5.44 V drop for 200A at 240V on Alum 250MCM (2.3%) and a 6.4V drop for 4/0 Alum (2.7%). Both are under the 3% recommendation. So your inspector appears to be full of it, but then that really doesn't matter in the end as you can't fight city hall...and it's too late now.