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: Multiplying these two values yields the true permissible short-circuit current, ensuring that maximum temperature limits—typically 250∘C250 raised to the composed with power cap C for XLPE insulation—are not exceeded. Accessing the Standard Safely and Legally iec 60949 pdf free top download

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where (epsilon) is the non‑adiabatic correction factor derived from the cable’s construction, materials, and fault duration.

For large power conductors, the non‑adiabatic gain is generally modest. The standard notes that for the usual range of power cable conductors, . For ratios of short‑circuit duration to conductor cross‑sectional area < 0.1 s/mm² , the improvement is negligible and the adiabatic method may be used without significant loss of accuracy .