Temperature rating

[Carultch]

Once you are within the supply or load equipment enclosure, you are subject to the terminal temperature limitation or the maximum operating temperature of the equipment, whichever is lower.

What about the compromise solution I had suggested? Can the original wire relying on the 90C rating pass through the destination equipment, to an adjacent splice enclosure, and then the spliced wire terminate on the destination equipment?

The 90C sized wire wouldn't be terminating in the 75C equipment, it would just be passing through.

 

[Smart $]

What about the compromise solution I had suggested? Can the original wire relying on the 90C rating pass through the destination equipment, to an adjacent splice enclosure, and then the spliced wire terminate on the destination equipment?

The 90C sized wire wouldn't be terminating in the 75C equipment, it would just be passing through.

A noteworthy question. IMO, if that 90°C wire's circuit has a [calculated] load which would cause the wire to exceed the equipment's 75°C rating, such a circuit conductor passing through would be a violation, even though it does not terminate within the said equipment. It would be a source of heat for which the equipment has not been tested.