I am needing to run wire from a meter pole 260' to the service panel. It is a 200 amp service. This is going to be burried most likely in conduit and none of it will be indoors and will probably be THHN aluminum. I am not sure what size wire to use. I was told that according to electrical code, a 200 amp service can't be loaded beyond 80%. My question is, when calculating wire size do I use 160 amps (80%) or 200 amps? Or what wire size should I use?