State inspectors here enforce along the lines of what you are thinking. The lugs in the panel are NOT ever rated 90�, therefore you cannot use the 90�rating for the final numbers. However you are allowed to use this number before making deduct tons for ambient temperature and box fill. Typically figure 40 amps for #8 copper, bit 30 amps for aluminum. As far as the wire in PVC, it is very hard to find wire that is not dual rated THHN/THWN. When you do find it, it is usually in rated assemblies such as romex. Again the state, subject to local rules, inspectors here say that even of it is in conduit but in a wet location you need to use THWN rated wire. So I cannot run romex from the wall of my house through 2'of seal tite to an air conditioning disconnect, but have to go right into the back of the disconnect or a Junction box. Is responsible see to the voltage drop, a rule of thumb is to step up a wire size for every 100 feet. There are voltage drop calculators on the internet to help find an exact number. In short you can't go wrong figuring everything at the lower temp ratings and maybe consult locall authorities.
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Today's Featured Article - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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