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Free Electrical Calculators & Testing Apps | TMUK Group Ltd

Engineering Toolkit

Select a category to access tools

Electrical Design & Sizing

Cable sizing, maximum demand, voltage drop, and circuit design suites.

10 Tools

Renewables, EV & HVAC

Solar PV, Battery Storage (BESS), EV Chargers, and Heat Pump calculators.

7 Tools

Inspection & Testing (EICR)

Observation builders, safe isolation permits, PFC, and Zs calculators.

8 Tools

Lighting & Commercial

LED ROI estimators, BS 5266 Emergency lighting planners, and Lux guides.

5 Tools

Apprentice Training

18th Edition mock exams, AM2 simulators, and interactive flashcards.

6 Tools

General Reference & Theory

Ohms law, kW/kVA converters, IP codes, and power factor calculators.

7 Tools

Public Safety & Landlord

PRS compliance trackers, hazard diagnostics, and client EICR guides.

5 Tools

About the TMUK Engineering Tool Kit

As a professional electrical contractor, ensuring strict compliance with BS 7671:2018+A3:2024 is paramount. This bespoke suite of free engineering calculators has been developed by TMUK Group Ltd to assist electricians, designers, landlords, and duty holders in verifying their installations, sizing cables accurately, and generating statutory health and safety documentation.

Our Core Engineering Suites

  • Electrical Design & Sizing: Advanced tools for accurate cable sizing, voltage drop verification, and complex maximum demand calculations for domestic, commercial, and industrial sites.
  • Renewables, EV & HVAC: Dedicated Solar PV, Battery Storage, EV Charging, and Heat Pump planners.
  • Inspection, Testing & EICR: Essential resources for verifying Earth Fault Loop Impedance (Zs), Prospective Fault Current (PFC), Ring Final Continuity testing, EICR Defect Classification, and digital Permit to Work (PTW) generation.
  • Lighting & Commercial Estimating: Commercial calculators tailored for generating immediate LED return on investment (ROI) proposals, BS 5266-1 emergency lighting layouts, and rapid project quoting.
  • Apprentice Training & Learning: Interactive test and exam engines designed to prepare electrotechnical learners for the City & Guilds 2382 exam, C&G 2391 assessment structures, and the rigorous AM2 practical verification bay.
  • General Reference & Theory: Quick calculators for Ohm's Law, Star-Delta conversion, IP codes, and kVA conversions.
  • Public Safety & Landlord Compliance: Guided diagnostic trackers to ensure properties meet the statutory requirements of the Private Rented Sector (PRS) regulations and basic consumer unit safety standards.

How to Use the Dashboard

Simply select the required engineering module from the grids above to launch the application. Each tool is designed to function flawlessly on mobile devices, allowing our field engineers, qualified supervisors, and apprentice learners to perform complex mathematical verifications or access study resources directly on-site without relying on signal-dependent cloud software.

Professional Disclaimer: The TMUK Group Ltd tools provided in this suite are intended strictly as design and training aids for competent persons. While every effort has been made to ensure accuracy in accordance with BS 7671 and current IET guidance, these tools do not replace formal engineering judgement. Final verification, testing, and certification must always be carried out by a qualified electrical professional.

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