21 free tools for Australian electricians
Sparky tools.
Earth fault loop, conduit fill, voltage drop, cable sizing and more. They run in your browser on site, and most need no account.
21 tools.
Cables and protection
- Earth Fault LoopWill the breaker trip fast enough on this circuit?
- Conduit FillWhat size conduit fits these cables?
- Voltage DropIs this cable run inside the voltage drop limit?
- Cable SizingWhat is the smallest cable for this load and run?
- Cable DeratingWhat will this cable carry once it is grouped or hot?
- RCD RequirementsDoes this circuit need an RCD, and which type?
Max demand and boards
Solar
Instrumentation
- 4-20mA ScalerWhat process value is this mA signal, and back again?
- RTD Lead ErrorHow much error does the cable add to this RTD?
- ThermocoupleWhat temperature is this millivolt reading?
- CalibrationIs this instrument inside its tolerance?
- PID TuningStarting PID values from a step test.
- SIL VerificationDoes this safety function reach its SIL target?
Workflow
Standard editions
Standards get revised. Each tool says which edition its data comes from, or says the edition is not confirmed. Not confirmed means nobody has checked those figures against a copy of the standard yet.
AS/NZS 3008.1.1:2025 has been published. Our cable tools still use the 2017 tables until we can check them against the 2025 edition. Intertek Inform summary of the 2025 edition.
These are reference tools. Check every result against the current edition of the standard you are working to before you rely on it for design, compliance or certification.
- Earth Fault Loop
- Clause numbers from AS/NZS 3000:2018. MCB limits are calculated from Uo / Ia, not copied from Table 8.1. Fuse limits: edition not confirmed.
- Conduit Fill
- Cable sizes from Nexans Olex product data (checked Oct 2026). Fill ratios: AS/NZS 3000 edition not confirmed.
- Voltage Drop
- AS/NZS 3008.1.1:2017 tables, 2025 edition not yet applied.
- Cable Sizing
- AS/NZS 3008.1.1:2017 tables, 2025 edition not yet applied.
- Cable Derating
- AS/NZS 3008.1.1:2017 tables, 2025 edition not yet applied.
- RCD Requirements
- AS/NZS 3000, edition not confirmed.
- Max Demand
- AS/NZS 3000:2018 Appendix C, Table C1 Column 2. Values not yet checked against a copy of the standard.
- Switchboard Builder
- No standard tables used.
- String Sizing
- AS/NZS 5033, edition not confirmed.
- MPPT Split
- Cold morning Voc formula as published by Mayfield Renewables. Inverter presets not confirmed against datasheets. AS/NZS 5033 edition not confirmed.
- Tilt & Azimuth
- No standard tables used. Shows how far the roof is from north and from the latitude tilt. No output percentage until a published table is built in.
- 4-20mA Scaler
- No standard tables used. Linear and square-root scaling only.
- RTD Lead Error
- Pt100 sensitivity of about 0.385 ohm per °C and the 3-wire mismatch model as published by ICS Schneider. IEC 60751 edition not confirmed.
- Thermocouple
- Type J checked against NIST Monograph 175 (ITS-90). Other types not yet checked against it.
- Calibration
- No standard tables used. Tolerances are the ones you enter.
- PID Tuning
- Published tuning rules (Ziegler-Nichols, Cohen-Coon, lambda). No standard tables used.
- SIL Verification
- 2oo2 uses the IEC 61508-6:2010 simplified formula as published by the 61508 Association. Other formulas and clause numbers not yet confirmed.
- Test Sheet
- AS/NZS 3000, edition not confirmed.
- Equipment Register
- No standard tables used.
- Sparky AI
- AI answers. Clause numbers are not checked against any edition. Check every answer against your copy of the standard.
- Fuel Calibration
- Tolerance not yet attributed to an NMI document. Edition not confirmed.