Neglecting derating factors is one of the leading causes of electrical fires in fixed installations. A robust design must always account for the worst-case thermal environment the cable will inhabit, not the ideal conditions of a testing lab.
Ignoring derating factors is a leading cause of unexpected cable failures, nuisance tripping, and reduced system lifespan.
The cable can safely carry only 73.5A , not 210A. To carry the intended load, a larger cable or improved installation (e.g., spaced cables, thermal backfill) is required.
Cable Current Rating Derating Factors Explained - ELEK Software
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