Learning Center
Educational guides that build your understanding from the ground up. Written for engineers at all levels.
Cable Sizing for Beginners — A Practical Introduction
A beginner-friendly guide to electrical cable sizing. Learn why cable sizing matters, what determines cable size, the basic steps involved, common cable sizes and their uses, and how to get started with professional cable sizing software.
12 min readUnderstanding Voltage Drop in Electrical Installations
Learn what voltage drop is, why it matters for electrical installations, what causes it, how it is measured, acceptable limits by standard, and practical tips to minimise it. A beginner-friendly guide for engineers and designers.
10 min readCable Short-Circuit Rating — How to Calculate & Verify
Calculate cable short-circuit withstand rating using IEC 60364. Step-by-step method with adiabatic equation, I²t let-through energy & worked examples. Free guide — no signup.
14 min readSkin & Proximity Effect on Cables — AC Resistance Explained
Why AC resistance exceeds DC resistance in power cables. Visual guide to skin & proximity effects with IEC derating factors. Free engineering reference.
13 min readHow Power Factor Affects Cable Sizing — Free Practical Guide
Understand why power factor increases cable size by 15-30%. Visual explanation with IEC & NEC references. By a field engineer with 18+ years experience. Free guide.
12 min readEarth Fault Current Paths: TN-S vs TN-C-S vs TT vs IT — Visualized
Compare the four earthing systems (TN-S, TN-C-S, TT, IT) with worked fault current examples, touch voltage calculations, and clear explanations of why TT systems require RCDs and IT systems tolerate a first fault. Includes the IEC letter code explained.
15 min readHarmonics and Cable Derating: The Modern Load Nobody Designed For
Learn how non-linear loads create harmonic currents that overload neutral conductors and require cable derating. Includes worked examples for LED installations and data centres, the triplen harmonic neutral current problem, and practical mitigation strategies.
14 min readWhat Is Voltage Drop and Why Does It Damage Equipment?
Understand what voltage drop is, why even a small percentage matters for motors and lighting, how cumulative drops add up from origin to load, and what transformer regulation means for real-world voltage levels.
10 min readWhat Is Power Factor and Why Do Utilities Penalise You for a Low One?
A practical explanation of power factor: what it means, why reactive power wastes conductor capacity, how utilities penalise low power factor, and the economic case for power factor correction capacitors.
10 min readWhat Is a Fault Current and How Is It Different from a Load Current?
Understand the difference between load current and fault current, why fault currents can reach 50 times rated current, what limits them, and why every protective device has an interrupting rating.
10 min readUnderstanding Cable Derating — Why the Same Cable Carries Less Current in Hot Weather
Learn why cables must be derated for ambient temperature, grouping, and installation method. Understand how derating factors multiply together and see a worked example showing how a 50 mm² cable's capacity changes under real-world conditions.
10 min readThree-Phase Power Explained — Why Industry Runs on Three Phases
Understand why three-phase power is used in industry: constant instantaneous power, more power per kilogram of copper, and self-starting motors. Learn the difference between star and delta, 400 V and 230 V, and balanced vs unbalanced loads.
12 min readIP Ratings Explained — What IP54, IP65, and IP68 Actually Mean for Electrical Enclosures
Learn what IP ratings mean for electrical enclosures. Understand the two-digit system for solids and liquids protection, common ratings like IP54, IP65, and IP68, IK impact ratings, and minimum IP requirements from AS/NZS 3000 and BS 7671.
10 min readEarthing vs Bonding — Two Different Functions That Are Often Confused
Learn the critical difference between earthing and bonding in electrical installations. Understand fault current return paths, equipotential bonding, main protective bonding, supplementary bonding, and what happens when each fails.
10 min readWhat Is Arc Flash and Why Is It the Most Underestimated Electrical Hazard?
Learn what arc flash is, how it differs from electrocution, what determines incident energy, the four PPE categories, and why fault clearing time is the single most influential variable. A practical guide for engineers and safety professionals.
10 min readHow to Read a Transformer Nameplate — Every Value Explained
Learn how to read every value on a transformer nameplate: kVA rating, voltage ratio, impedance percentage (uk%), vector group (Dyn11), temperature rise class, and what each means for system design. A practical guide with real-world examples.
12 min readRCDs, RCBOs, and ELCBs — What They Protect Against and What They Don't
Learn how residual current devices work, the difference between RCDs, RCBOs, and ELCBs, what 30 mA and 300 mA thresholds mean, what RCDs cannot protect against, and why long cable runs cause nuisance tripping. A practical guide for engineers and electricians.
10 min read