The first question that comes to mind is where is the meter? I know that different parts of the country does things different than other parts of the country but here the power company brings the power to the meter. Do they do that on the soon to be island of Ca.?
Soon to be island is referring to something someone told me about some sort of fault out there and the ground shaking all the time. They told me that Ca. would one day be an island, is that true?
To do the calculation for the attic one would need to know what the ambient temperature of the attic. Once you know this go to Table 310.15(B)(2)(a) of the 2011 cycle or the bottom of 310.16 of older cycles and do the math.