Decision first
Outputs state what matters, not only intermediate numbers.
ELECTRICAL ENGINEERING SOFTWARE
Electrical Engineering Software & Calculators
Standards-aware tools for cable sizing, voltage drop, motors and short-circuit protection — with assumptions and engineering limits kept visible.
BUILT FOR DAILY ENGINEERINGLess searching. More engineering.
REAL WORK01
FOR ENGINEERSMove from inputs to a defensible result faster.
FASTER02
FOR REVIEWERSInputs, assumptions and methods stay visible.
TRACEABLE03
FOR TEAM LEADSStandardize routine checks and reduce avoidable rework.
CONSISTENTENGINEERING OUTCOMEFaster checks. Clearer reviews. Better handovers.
✓ALL CALCULATORS
Engineering calculators.
Twenty-three engineering tools are available, including the Cable Design & Verification PILOT workflow alongside IEC and North American calculators.
01
IEC CABLE DESIGN
FEATUREDIEC Cable Sizing
Size conductors using IEC 60364-5-52 installation methods, temperature and grouping correction, voltage drop and short-circuit thermal withstand.
mm²A1–E methodsCu / Al
23
IEC VERIFICATION WORKFLOW
PILOTCable Design & Verification
Verify or design an IEC cable through ampacity, protection, voltage drop, short-circuit thermal checks and a lifecycle cost screen.
IECMulti-check workflowPILOT
02
NORTH AMERICAN CABLE DESIGN
NEWNEC Cable Sizing
NFPA 70 Article 310 workflow with AWG/kcmil, ampacity temperature columns, ambient correction and current-carrying-conductor adjustment.
AWG / kcmil60/75/90 °CNEC
03
PROTECTION ENGINEERING
FREE + PROFaultChain
Start with free fault-current and breaking-capacity screening. Pro adds graphical distribution modelling, cable I²t checks, protection charts and engineering reports.
Start freeGraphical Pro workflowReports
04
CABLE DESIGN
FREEVoltage Drop
Calculate AC voltage drop from conductor size, temperature, power factor and reactance, then compare it with your project target.
05
CABLE DESIGN
FREECable Ampacity
Apply installation correction factors to a verified base ampacity and screen design current and protective-device rating.
06
MOTOR DESIGN
FREEMotor FLC
Estimate running and screening starting current from motor power, system voltage, efficiency and power factor.
07
ELECTRICAL FUNDAMENTALS
FREEOhm’s Law
Solve voltage, current, resistance and power from any two compatible known quantities with the equation path shown.
08
SHORT-CIRCUIT DESIGN
FREETransformer Short Circuit
Estimate transformer-terminal fault current from rating and impedance, with optional finite upstream source fault level.
09
CONDUCTOR SIZES
FREEAWG ↔ mm²
Compare AWG and metric conductor area correctly, including nearest and minimum-area standard AWG results.
10
NEC RACEWAY
FREENEC Conduit Fill
EMT/PVC raceway fill with mixed conductors, NEC limits and a three-cable jamming warning.
21
IEC CONDUIT DESIGN
FREEIEC Conduit Fill
Screen round conduit and rectangular cable duct fill from internal dimensions, cable outside diameters and a project limit.
11
OVERHEAD LINE ENGINEERING
BETACatenary PRO
Full sag, tension, ruling-span, temperature, wind, ice and stringing-chart workflow.
12
POWER QUALITY
FREEPower Factor Correction
Calculate capacitor kvar and current reduction from existing and target power factor.
13
GENERATION
FREEGenerator Sizing
Estimate running kVA, starting allowance and a practical generator size.
14
EARTHING
FREEEarthing & Grounding
Screen PE conductor and vertical earth-electrode calculations with explicit assumptions.
15
LOAD PLANNING
FREELoad Schedule
Build connected and diversified load totals from editable load groups.
16
DISTRIBUTION
FREEBusbar Sizing
Screen current-density and adiabatic short-circuit cross-section.
17
SAFETY SCREENING
FREEArc Flash Boundary
Scale a validated incident-energy result by working distance. Screening only.
18
FUNDAMENTALS
FREEThree-Phase Power
Calculate kW, kVA, kvar and phase angle from voltage, current and power factor.
19
INSTRUMENTATION
FREECT Burden & Lead Sizing
Calculate secondary lead burden and compare required VA with the selected CT rating.
20
LIGHTING
FREELighting Design
Estimate luminaire quantity, maintained illuminance and lighting power density.
22
POWER QUALITY
NEWHarmonic Filter Sizing
Size AHF compensation current and screen passive filtering from load mix, target THDi and grid conditions.
FREEAHF / Passive
Most engineering calculators return a number. ElectroDesigner is built to return a decision.
DESIGN PRINCIPLES
Explicit inputs
Project assumptions remain visible and editable.
Traceable logic
Equations and limitations are shown beside the result.
Standards-aware
IEC and NEC workflows remain clearly separated.
KNOWLEDGE HUB
Learn the method behind the number.
Use the calculators for the check, then read the engineering reasoning, limits and terminology behind it.
Three-Phase Voltage Drop: Formula, Example and Design Limits
Why √3 appears, how conductor resistance affects the result, and where simplified formulas stop being sufficient.
Read article →Short-Circuit Current, SCCR and Interrupting Rating: What Changes?
Separate available fault current from equipment ratings and protective-device interrupting capacity.
Read article →I²t Let-Through Energy Explained for Protection Coordination
Understand thermal stress, current limitation and downstream withstand checks.
Read article →ENGINEERING TOOLBOX
Use the free toolbox. Go deeper only when the study needs it.
Free calculators require no account. When protection analysis grows beyond a single check, FaultChain Pro adds the connected workflow.