2017 NEC Table 310.15(B)(17) - rho assumption?

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fossil112

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Fellow EE's,

Where might I find some insight on the assumed rho value (°C-cm/W) for this table?

For comparison's sake, Etap provides a table with typical thermal resistivities of common components. One of them being air at 4000°C-cm/W. Their source is Electric Power Distribution Equipment and Systems.
 
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