Protection calculators

Protective-device, conductor, fault-current, loop-impedance, RCD and measurement-record calculation workflows.

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

CalculatorFault loop impedance calculatorEstimate 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.
CalculatorShort-circuit current calculatorEstimate 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.
CalculatorI2t cable withstand calculatorScreen 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.
CalculatorRCD 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.
CalculatorRCD test log calculatorSummarise 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.
CalculatorDevice coordination worksheet calculatorCompare 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.
CalculatorProtective device energy check calculatorCompare entered protective-device energy with an entered withstand limit and current-time cross-check.Inputs: Worksheet reference, device reference, entered device energy, withstand limit, clearing time and fault current.Output: Entered-energy worksheet, not equipment choice or manufacturer curve interpretation.
CalculatorTouch voltage estimate calculatorEstimate touch voltage from entered current and path impedance assumptions.Inputs: Worksheet reference, contact scenario, entered current, path impedance, contact duration and entered threshold.Output: Entered-assumption worksheet, not a work method or human-response conclusion.
CalculatorInsulation resistance record calculatorCompare an entered insulation-resistance measurement with a user-entered criterion.Inputs: Test reference, test voltage, measured resistance, entered criterion and circuit count.Output: Measurement-record comparison, not a universal threshold or verification decision.
CalculatorContinuity resistance calculatorSubtract lead resistance from an entered continuity measurement and compare with an entered criterion.Inputs: Test reference, measured resistance, lead resistance, test current and entered criterion.Output: Lead-compensated measurement worksheet, not a conductor adequacy decision.
CalculatorProtective conductor check calculatorCompare an entered protective conductor area with a required area supplied by the user.Inputs: Conductor reference, candidate area, parallel count, required area and source basis.Output: Entered-area comparison, not protective conductor selection.
CalculatorBreaker rating comparison calculatorCompare an entered protective-device rating with load-current and fault-duty values.Inputs: Device rating, calculated load current, prospective fault current and breaking capacity.Output: Entered protective-device comparison, not device selection or coordination.
CalculatorFuse let-through comparison calculatorCompare entered fuse let-through energy with an entered cable or equipment withstand limit.Inputs: Fuse reference, let-through energy, withstand limit, clearing time and fault current.Output: Entered energy comparison, not fuse or cable selection.
CalculatorArc flash pre-screening calculatorRecord user-defined arc-flash triage flags from entered fault current, clearing time and working distance.Inputs: Assessment reference, prospective fault current, clearing time, working distance and entered thresholds.Output: Relative pre-screening record, not incident-energy calculation or PPE selection.
CalculatorEarth electrode resistance calculatorEstimate earth-electrode resistance from entered soil, geometry, method factor and optional measured value.Inputs: Record reference, soil resistivity, electrode geometry, method factor, target and optional measured value.Output: Worksheet resistance record, not earthing arrangement verification or installation decision.

Calculation tools, structured tables, charts and guides for Australian electrical work using local terms, metric conductor sizes and 230/400 V, 50 Hz context.

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