AUWiring

Cable sizing calculators

Voltage drop, conductor size screening, cable data preparation, cable logistics and cable-loss checks for Australian project contexts.

  • 18 calculators
  • Australian workflow
  • 230/400 V a.c. context

Cable sizing calculators project basis

Voltage drop, conductor size screening, cable data preparation, cable logistics and cable-loss checks for Australian project contexts. These calculators support Australian design, estimating, installation and verification preparation. Keep the circuit, equipment, route, supply arrangement and source data with the result before it is used in a project record.

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Confirm the nominal 230/400 V a.c. or project-specific voltage basis, 50 Hz context where applicable, phase arrangement, metric units, manufacturer information, DNSP or authority conditions and current project documents before applying a result.

Check entered values, supply arrangement, cable or equipment data, product limits, DNSP or authority conditions and review limits before using the result.

Records covered

  • Voltage dropEstimate voltage drop for an AC cable run. Inputs: Supply arrangement, voltage, current, route length, conductor data. Output: Voltage drop in volts and percent, with assumptions shown beside the result.
  • Cable sizeScreen candidate metric conductor sizes against entered project values. Inputs: Load current, route length, conductor material, installation notes, target drop. Output: Candidate-size estimate requiring project and standards verification.
  • Submain voltage dropReview voltage-drop allocation for submains and consumer mains. Inputs: Demand current, one-way route length, upstream allowance, downstream allowance. Output: Allocation check for design review, with project verification still required.
  • DC voltage dropEstimate voltage drop for a two-wire DC cable run. Inputs: DC current or kW, nominal DC voltage, route length and conductor data. Output: DC voltage-drop record with load-side voltage, cable loss and target margin.
  • Solar DC cable sizingScreen a PV DC cable candidate against an entered voltage-drop target. Inputs: PV current, string voltage, route length, cable size, resistance and temperature factor. Output: PV DC voltage-drop record with load-side voltage, loss and maximum route length.
  • Cable short-circuit ratingEstimate conductor short-circuit withstand current from entered area, k value and clearing time. Inputs: Conductor area, k value, clearing time and available fault current. Output: Withstand current and I2t comparison record for project review.

Review before applying

Cable sizing calculator results are preparation records. Keep entered values beside current Australian requirements, DNSP or authority conditions, manufacturer information and project documents before applying a result.

Recheck the selected calculator whenever the supply arrangement, equipment data, route length, tariff basis, measurement method or project document set changes.

  • TablesSupply, unit and cable-record lookup tables.
  • Voltage-drop formulasFormula chart for voltage-drop relationships.
  • GuidesCable input assumptions and verification notes.