Electrical engineering, made practical

Design, size and test electrical systems with confidence.

Free calculators, step-by-step design guides and job-test MCQs for electrical engineers, students and contractors in Pakistan.

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Quick tools7 calculators
Voltage Drop Calculator Wire Size Calculator Breaker Size Calculator Transformer Sizing Calculator See all calculators
Tools

Electrical calculators

Quick sizing checks for everyday design work.

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Voltage Drop CalculatorCheck cable voltage drop against permitted limits. Wire Size CalculatorPick a cable size for a given load and run length. Breaker Size CalculatorFind the right breaker rating for a circuit. kVA CalculatorConvert between kVA, kW, amps and volts. Transformer Sizing CalculatorSize a transformer from connected load. Generator Sizing CalculatorEstimate standby generator capacity. Conduit Fill CalculatorCheck how many cables fit in a conduit.
Guides

Learn by project stage

01DesignLoad calculation, SLDs, fire alarm and CCTV design. 02ExecutionSite installation practice and construction drawings. 03TestingInspection and commissioning, including generator tests. 04Blog & newsIndustry updates and engineering career news.

Most-read guides

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DesignHow to Read Electrical Drawings: Symbols, Plans and Single-Line Diagrams Sample preliminary electrical load calculation worksheetDesignArea-based Electrical Load Calculation in Building Design Heat detector spacing on a smooth ceiling, NFPA 72 (2022)CodesNFPA 72 Fire Alarm Requirements (2022): Detector Spacing and Locations Construction drawingsDesignList of Construction Drawings for Building Construction Earthing works on siteBasicsEarthing vs Grounding vs Bonding: Differences Explained Generator testingTestingNew Generator Testing Protocols: Step-by-Step Guide
Job test preparation

MCQs for NTS, PTS, WAPDA & PEC tests

Practise by subject, then test yourself on real past papers.

Start practisingPast papers
AC Fundamentals DC Fundamentals Electrical Machines Power Transformers Electromagnetism Semiconductors Transistors Sources of E.M.F MCQs from VK Mehta Recommended books
DirectoryElectrical consultants in PakistanFind design consultancy firms for your next building project.View list → DirectoryElectrical contractors in PakistanFind contractors for installation and execution work.View list → CourseLearn electrical design consultancyFrom load calculation to drawings: the skills consultancy firms hire for.See the course →