Calculators and Tools
ElectroBoard offers 13 free online tools for electricians and installers. They are available at /tools with no sign-in required.
⚡ Calculations
Cable Cross-Section Calculator
Sizes the minimum conductor cross-section for the given parameters:
- Load power or current
- Installation method (in a wall, in conduit, on the surface, underground)
- Circuit length
Output: the recommended cross-section, the permissible current (ampacity), and the voltage drop — evaluated across the IEC 60364-5-52 range.
Breaker Selection Calculator
URL: /tools/breaker-calculator
Selects the rating and tripping characteristic of a miniature circuit breaker (MCB, IEC 60898-1):
- From load power or current
- Accounting for the load type (cos φ, inrush factor)
- With a cable-coordination cross-check
Output: the recommended rating, the tripping curve (B/C/D), and the minimum cable cross-section.
Voltage Drop Calculator
URL: /tools/voltage-drop
Calculates the voltage drop along a cable run:
- Cross-section and length
- Current or power
- Conductor material (copper / aluminium)
Output: the drop in volts and per cent, assessed against the usual limits (3% for lighting, 5% for other circuits). Single-phase runs use the double-length formula; three-phase runs apply the √3 factor for the 400 V line voltage.
Phase Balance Calculator
URL: /tools/load-balance
Helps distribute the load across the phases of a three-phase supply:
- Enter the load on each phase
- See the imbalance as a percentage
- Get redistribution suggestions
RCD / RCBO Selection
Selects the parameters of a residual-current device (RCD) or a combined RCBO for a circuit:
- Room or circuit type (bathroom, kitchen, socket circuits, lighting, outdoor/garage, workshop, main fire-protection incomer, server equipment)
- Earthing system (TN-S, TN-C-S, TT, TN-C, IT) — with a warning that an RCD cannot work on a TN-C system
- Number of phases, group power, and number of circuits under one device
- An inverter-load flag (washing machine, air conditioner, variable-speed drive) that raises the device type to A
Output: the recommended device type (AC / A / B / S-selective, per IEC 61008 / 61009), the residual current (10 / 30 / 300 mA — 30 mA for personnel protection per IEC 60364-4-41), the rated current from the 16–100 A range, the pole count (2P or 4P), and the maximum number of groups per device.
Whole-House Power Calculator
URL: /tools/power-audit
Estimates the total demand of a property from a list of appliances:
- Catalogue of 28 household appliances with typical power ratings
- 4 presets: 1- and 2-room apartment, house, garage
- Diversity (demand) factor
Output: the installed and design power, the recommended main breaker, the cable cross-section, and the supply type (single- or three-phase).
Lighting Calculator
URL: /tools/lighting-calculator
Calculates the number of lamps for a room against illuminance targets (EN 12464-1):
- 12 room types (residential, office, utility)
- 4 lamp technologies: LED, fluorescent, halogen, incandescent
- Ceiling-height and wall-colour correction
Output: the required luminous flux (lm), the lamp count, the circuit power, and a recommended breaker and cable.
🔄 Converters
W ↔ A ↔ V Converter
Converts between current, power, and voltage for different supply types:
- Single-phase (230 V), three-phase (400 V), DC
- 3 modes: W→A, A→W, V×A→W
- Power factor cos φ (slider 0.5–1.0)
- 6 presets for common loads
Output: the current, the active and apparent power, and a recommended breaker and cable cross-section.
AWG ↔ mm² Converter
URL: /tools/awg-converter
A cross-reference table from American Wire Gauge to metric cross-sections (IEC 60228):
- 15 AWG sizes (from AWG 0 to AWG 24)
- Two-way conversion: AWG → mm² and mm² → AWG
- Conductor diameter, permissible current (in a cable and in free air)
- Nearest metric equivalent and typical use
Useful when working with imported equipment from the US or Canada.
📚 Reference
IP Protection Ratings
URL: /tools/ip-rating
An interactive reference for IP codes per IEC 60529:
- Decode any IP code by its first and second digit
- Reverse lookup: pick an installation location → the minimum IP
- Clickable 7×10 matrix of every digit combination
- 13 typical installation locations with a recommended IP
Wire Colours
URL: /tools/wire-colors
A colour-coding table for conductors across three standards:
- IEC 60446 / HD 308 S2 — the harmonised European coding
- Legacy Soviet-era coding (older installations)
- NEC (US and Canada)
Reverse lookup: click a colour → which conductor it is. A side-by-side comparison of all the standards.
Electricity Cost
URL: /tools/energy-cost
A calculator of daily, monthly, and yearly electricity spend:
- 8 default appliances plus a catalogue of 10 more presets (electric hob, EV charging, heat pump, etc.)
- Custom appliances (power + hours per day)
- Country presets (Ukraine, Germany, France, Poland, Czechia, Spain, United Kingdom) each with an indicative tariff
- A VAT toggle (price with/without tax) and a two-zone day/night tariff
Output: the daily/monthly/yearly cost, the top consumers with a bar chart, and saving tips.
🏷️ Design
Panel Label Generator
Creates printable labels for modular devices on a DIN rail:
- Several rails with any number of modules
- Support for MCBs, RCDs, RCBOs, isolators, contactors, SPDs, and fuses
- Phase colour-coding L1/L2/L3 per IEC 60446
- Selectable module width — 17.5, 18 or 18.5 mm (18.5 by default), plus a per-device custom width
Output: an A4 sheet of labels ready to print. The state is saved in the browser between sessions.
Tip: All the tools run independently of the panel editor and need no sign-in. Use them for quick on-the-go calculations. The full list is at /tools.