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There is no formal guidance or rule of thumb for determining ambient air temperature for wire runs through non-climate controlled areas in residential applications. Ultimately, since it is open to interpretation, check with your local inspector on what they will accept. If the non-environmentally controlled space is going to be close to or hotter than ...


Size it for the highest expected temps in the area (geographically and part of building - huge differences there). If on the border line, then size to the conservative side and use bigger conductors or more runs. In my area, the high temps would be 105'F If we add another 50'F for an attic (worst case per your numbers) that would place me in the 155'F+ ...

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