Long Trench Armored Cable Voltage-Drop & Fault-Loop Impedance (Zs) Sizer

Deterministic Hot-conductor 80°C fault-loop impedance Zs <= U0 / I_a (<0.4s magnetic trip) + 3-phase soil thermal derating & ΔU% drop engine (.pdf, .csv, .json) built for ABB, Prysmian, Nexans, Schneider Electric — zero-upload ephemeral Wasm RAM execution.

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