Engineering Tools
Electrical design tools, built for engineers.
A growing suite of free tools to support your electrical engineering work — from quick sanity checks to detailed calculations.
LV Cable Sizer
IEC 60364-5-52 · BS 7671 · NEC 2023 · Low Voltage
Size low-voltage power cables to IEC 60364-5-52, BS 7671:2018, or the NEC. Handles temperature correction, grouping derating, voltage drop, OCPD selection, and PE/EGC sizing, with saved cases and printable reports.
UK Grid TEC Register
NESO · GB Grid Connections · Live Data
Browse every generation and storage project holding a GB transmission entry capacity agreement. Filter by plant type, stage, and status. Download the filtered dataset to branded Excel.
MV Cable Sizer — NEC
NEC 310.60 · 2001 V – 35 kV · Copper & Aluminium
Size medium-voltage cables (2001 V to 35 kV) to NEC Article 310.60. Handles continuous/non-continuous loads, temperature correction, conduit fill adjustment, voltage drop, and ampacity table look-up for XLPE and EPR insulation.
Cable Sheath Voltage
IEC 60287 · ENA C55 Bonding
Calculate induced sheath voltages and circulating currents for MV/HV single-core cables. Determine bonding method (single-point, solid, or cross-bonded) and select ENA C55 link box types with SVL requirements.
Cable Pulling Calculator
ICEA P-45-482 · BS 8010
Calculate cable pulling tension and sidewall bearing pressure for cables installed in ducts and conduits. Define multi-section routes with straight runs, bends, and inclined sections.
Earthing Conductor Sizing
IEEE 80-2013 Eq. 37 · IEC 60364-5-54 · Fault Withstand
Calculate the minimum earthing conductor cross-section to withstand prospective fault current. Compare IEEE Std 80 thermal formula against IEC adiabatic method for copper, aluminium and steel. Standard size comparison table with printable report.
Earthing Design
IEEE Std 80-2013 · Grid Earthing · Safety Assessment
Design substation earthing grids to IEEE Std 80-2013. Size grid conductors, calculate grid resistance and GPR, verify mesh and step voltages against tolerable limits, and generate a printable design report.
Vehicle Path Assessment
Swept Paths · PDF Drawing Overlay · Standard Vehicles
Place standard or custom vehicle outlines on an uploaded PDF drawing and visualise swept paths for access route verification. Export an annotated PDF for planning submissions.
Short Circuit Current Calculator
Fault Level · IEC 60909 Method
Calculate the maximum prospective short circuit current at any point in a radial network. Based on source impedance, transformer impedance, and cable impedance contributions.
BESS Design Tool
Battery Energy Storage · Sizing · Grid Integration
Design and size battery energy storage systems for utility, commercial, and industrial applications. Covers capacity sizing, C-rate selection, inverter matching, and grid code compliance checks.
Solar Design Tool
PV Array · Inverter Sizing · Yield Estimation
Design grid-connected and off-grid photovoltaic systems. Size PV arrays, string inverters, and combiner boxes while estimating annual energy yield and system performance ratio.
Protection Design Tool
Relay Coordination · Grading · Settings
Coordinate overcurrent and earth fault protection for LV and MV networks. Calculate relay settings, grading margins, and discrimination times to ensure selective fault clearance.
Need Something Specific?
We build tools our clients actually need.
If there's a calculation or tool that would save your team time, let us know. We're continuously expanding this suite based on real engineering workflows.
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