Marine Cable Derating, Voltage Drop, Protection Window, Fault Duty, Parallel Runs & Route Capacity

Shipboard Cable Ampacity, Voltage Drop, Breaker & Retrofit Route Capacity Tool

Screen whether an existing or proposed shipboard circuit can carry a retrofit load without exceeding the entered manufacturer/project cable ampacity or voltage-drop limit. Advanced mode adds starting drop, parallel runs, breaker protection and interrupting duty, route fill and support-weight reserve, multi-circuit retrofit loading and installation readiness.

Data type
Currency
↑
Need much more depth? Click Advanced above. Add separate temperature/grouping/installation factors, parallel runs, R/X impedance, starting current, breaker long-time and interrupting duty, route fill/weight, multiple retrofit circuits, installed cable cost and engineering-readiness checks.

Fast Cable Capacity & Voltage-Drop Screen

Enter cable ampacity and impedance from the applicable marine cable manufacturer, approved project table or engineering basis. Simple mode intentionally does not infer ampacity from conductor size alone.

V.
kW.
Ignored for DC.
%.
m.
A from manufacturer / approved project basis.
Combined temperature, grouping, installation and project factor.
Ω/km at operating temperature. For AC, use the effective R cosφ + X sinφ basis.
% project / class / equipment limit.

Advanced Circuit Electrical Load

V.
kW.
%.
% planning / project margin above running current.
m.
× running current. Use ~1 for VFD / soft-start / non-motor cases where appropriate.
% project / equipment limit.
% project / equipment limit.

Cable Ampacity & Impedance Basis

Use 1 for one multicore cable per run; enter actual physical count for single-core arrangements.
A.
Ω/km.
Ω/km. Ignored for DC.
mm.
kg/m per physical cable.

Breaker & Fault-Duty Screen

A relevant long-time protection basis.
kA.
kA at the applicable voltage / duty.

Retrofit Route Capacity

Cross-sectional fill is a planning screen only. Segregation, spacing, support, bends, transits, pulling access and fire / redundancy rules can govern before simple area fill.

mm.
mm.
% approved project / class / yard limit.
% of total route cross-section.
% of route.
kg/m.
kg/m approved project / support basis.
Selected currency / physical cable-metre.

Retrofit Circuit Register

Each row is evaluated independently for ampacity, running voltage drop, breaker current window and breaker interrupting duty. All rows also contribute cable area and weight to the shared route-capacity screen. Row labels are not submitted to Ship Universe Tool Data.

CircuitSystemVkWPFEff %Length mMargin %ParallelBase ATotal derateR Ω/kmX Ω/kmMax VD %Breaker AFault kABreak kAOD mmPhys/runkg/m

Engineering & Installation Readiness

Electrical engineering screen only: this tool is not a class-approved cable-sizing, protection-coordination, short-circuit, arc-flash, harmonics, EMC, fire-safety, hazardous-area, selective-tripping or cable short-circuit-withstand study. Do not infer marine cable ampacity from conductor size alone. Use approved cable data and the installation / correction factors applicable to the vessel. Breaker acceptance also requires the correct trip characteristics, selectivity, making duty, breaking duty and cable short-circuit withstand.
Reference context: IEC 60092-352:2025 covers selection, installation and operating conditions of fixed shipboard electrical cables up to Um 18/30 (36) kV. IEC 60092-302-2:2025 addresses low-voltage marine power switchgear and controlgear assemblies up to 1,000 V AC or 1,500 V DC. IEC 60947-2:2024 is the current IEC circuit-breaker product standard within its stated voltage scope. Apply the edition, class rules, flag requirements, equipment ratings and cable-manufacturer data governing the actual vessel and retrofit. IEC 60092-352:2025 · IEC 60092-302-2:2025 · IEC 60947-2:2024
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