A sub panel in a garage 80 feet from the main panel. Buying panel with a selection of breakers I only see 100 and 125 amp boxes. This is way over kill for what I need.
Lets assume all wire is rated at 90 degrees. Since finding breakers in odd sizes like 55 or 65 is hard lets just stick with round numbers.
So if I run 8 gauge wire I can protect it with a 50 amp breaker in the main box. That puts me in the 75 degree chart so that is fine with me.
While 50 amps should be enough I was thinking like some of you and run a little over kill. To move up to 60 amps I need 6 gauge wire. And here comes my problem. 6 gauge is rated at 55;65;75 depending on what temperature range you use. So if I bump up to 60 amps I am still in the 75 degree chart. Everything still good.
But if I am going to spend the money to run 6 gauge wire to a 100 amp rated box why not use a 70 amp breaker at the main box. Problem is that puts me in the 90 degree chart. And we now know all wire is rated for 90 degrees so that solves that problem.
But I still need to figure out what temperature rating the lugs in the sub panel and my main panel are rated at as these connectors are most likely my weakest link.
If I look at the breakers or sub panel I see things like "rated for 120/240 VAC and 10,000 AIR" But I do not know what 10,000 AIR means I see no reference to 75 or 90 degrees in the specifications.
This is all still up in the air and I can go any way. Just trying to get a cost sheet of all supplies I need for my new garage/pole shed.
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