Cable - Trefoil vs Flat Formation

Cable-ampacity difference between trefoil and flat formation per IEC 60287 - ship cable trays rarely perfect trefoil.

CableFormationDerating

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

I_{trefoil} \approx 1.05 \cdot I_{flat}

Symbol	Meaning	Unit
$I$	Continuous ampacity	A

Source: IEC 60287 / 60092-352

Cable-ampacity difference between trefoil and flat formation per IEC 60287 - ship cable trays rarely perfect trefoil.