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Parallel Cable Ampacity Calculator

Estimate total and corrected ampacity for parallel cable runs using an entered per-run capacity and grouping factor.

Inputs

Project inputs and assumptions

Range: 0.01–100,000 A

Enter the verified ampacity of one identical run before the entered grouping factor; source it for the actual conductor, installation method and temperature basis.

Range: 1–100

Enter the number of identical parallel runs that share current under the same installation conditions.

Range: 0.01–2

Enter the verified combined correction for the actual parallel arrangement; do not double-apply factors already included in the per-run ampacity.

Range: 0–100,000 A

Enter the total feeder design current to compare with corrected parallel capacity.

Range: 0.1–100,000 A

Enter the protective-device rating to compare with corrected parallel capacity; device selection and coordination remain separate checks.

Result

Design-current margin (A)
16.00
Corrected parallel capacity (A)
136.00
Protective-device margin (A)
11.00
Total reference capacity (A)
160.00
Result
The corrected parallel capacity covers the entered design current and protective-device rating in this arithmetic comparison. Confirm sharing, terminations, spacing, fault withstand and the applicable Australian requirements separately.

Formula

Calculation logic

Formula definitions and substituted values.

Before relying on the result

  • Compare two or more parallel runs with a feeder demand
  • Screen grouping effects before consulting installation rules
  • Verify conductor arrangement, spacing, termination, sharing and current AS/NZS 3008 requirements before relying on the result.

Related calculators

Verify conductor arrangement, spacing, termination, sharing and current AS/NZS 3008 requirements before relying on the result.