Designing for "hot" or high-current environments requires balancing material properties with thermal limits:
One of the most referenced sections of the INDAL handbook deals with aluminium busbars housed in enclosed panels (PCC/MCC). The "hot" rating in free air is optimistic; in a box, it’s dangerous.
, chosen for their balance of high conductivity and mechanical strength. A.C. & D.C. Applications: Analysis of electrical behaviors like the skin effect (current crowding on the surface in AC) and proximity effect
"We’re hitting 85 degrees Celsius on the main busbar," Arjun muttered. "If it hits 100, the thermal expansion will buckle the mounts and the whole grid goes dark."