AUWiring

Protection calculators

Prepare fault-current, loop-impedance, RCD, conductor-withstand and protective-device comparison records from entered Australian project values.

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

Protection calculators project basis

Prepare fault-current, loop-impedance, RCD, conductor-withstand and protective-device comparison records from entered Australian project values. 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

  • Fault loop impedanceEstimate fault current from entered loop impedance and compare with an entered threshold. Inputs: Voltage, impedance and optional review threshold. Output: Engineering check requiring instrument, protection and standards review.
  • Short-circuit currentEstimate prospective short-circuit current from source or transformer data. Inputs: Source impedance or transformer kVA and impedance values. Output: Prospective-current estimate for protection review.
  • Cable withstandScreen adiabatic cable short-circuit withstand from entered values. Inputs: Fault current, clearing time, conductor material and selected k value. Output: Withstand estimate requiring standards and manufacturer confirmation.
  • RCD test checkerOrganise measured RCD test results against entered criteria. Inputs: Device rating, test multiplier, measured trip time and entered criteria. Output: Measurement worksheet, not a universal status decision.
  • RCD test logSummarise multiple entered RCD or RCBO test rows and count rows needing review. Inputs: Log reference, row references, device labels, row types, outcomes, measured times and entered criteria. Output: Multi-row worksheet summary, not an original instrument record or final project decision.
  • Device coordination worksheetCompare entered upstream and downstream protective-device points at the same current basis. Inputs: Worksheet reference, upstream device, downstream device, fault current, clearing times and entered separation. Output: Entered-point worksheet, not manufacturer curve plotting or detailed coordination work.

Review before applying

Protection 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.