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Power Systems Technical Articles

Our experts continuously work on power systems problems, and we share solutions with Practical Reference Articles.

The main topics are earthing system modeling, power cable ratings, HV/LV electrical design, protective device coordination, and arc flash studies. We cover IEC and IEEE standards.

Sign up for my email newsletter and I will send you the latest technical articles as they are released – Jayson Patrick

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Low Voltage Design
Earthing Design
High Voltage Cable Design
Arc Flash Studies
Software Comparisons
Electrical Software
Flowchart showing a series of squares, some filled red, on a path moving upward toward a "Higher Priority" label with an arrow on the right side.
3 mins read

Practical Guide to Selective Protection Coordination

Learn how to set priorities and adjust protective devices for selective coordination to isolate faults and minimise outages in electrical systems.
A graph displays time-current curves with a blue and red shaded areas, showing time (s) on the y-axis and current (A) on the x-axis, both on logarithmic scales.
2 mins read

A Step-by-Step Protection Coordination Study Example

Learn how to set and coordinate circuit breakers to meet AS/NZS 3000:2018, ensuring faults are isolated quickly and safely in electrical systems.
Close-up of orange industrial cables coiled together, with one frayed open end visible in the foreground.
10 mins read

AS/NZS 3008 Cable Sizing Calculations: Step-by-Step Guide

Size active, neutral, and earth cables using AS/NZS 3008. The guide covers current capacity, voltage drop, and short-circuit calculations with examples.
Close-up of an electrical panel displaying several circuit breakers, labeled with yellow tags such as QF1, QF2, and QF6, and connected by various colored wires.
4 mins read

The Ultimate MCB Protective Device Selection Guide

Miniature Circuit Breakers (MCBs) protect against overcurrent in electrical circuits. MCBs are categorised based on their tripping characteristics, represented by different device curves such as Z, B, C, K, and D. This article offers guidance on selecting the right type for your application.
Screenshot of an application showing an edit load panel with fields for electrical installation, description, and phases. A photo of a 6-socket outlet adapter, quantity set to 12, is highlighted in red.
3 mins read

Double Socket-outlets in Maximum Demand Calculations

The AS/NZS 3000 Standard provides different rules in Appendix C for maximum demand with socket-outlets for domestic, commercial, and industrial electrical installations. Calculation examples are provided involving double socket-outlets.
Electrical Wiring Being Installed for a New Commercial Building
7 mins read

Economic and Energy Efficient Cable Sizing

The principle of economic cable sizing is to select a minimum cable size that is safe to use and the cost of the losses over the lifetime is also minimised.
Orange PVC electrical conduit of different sizes
7 mins read

Conduit Sizing Requirements with Example Calculations

Equations for calculating conduit sizes and space factors in accordance with standards are provided. Worked examples of conduit sizing calculations are provided.
Short circuit cable rating ELEK Software 1 1170x585 - Articles - Low Voltage Design
4 mins read

Short Circuit Power Cable Sizing Explained

The fault current which flows in a power cable causes its temperature to rise dramatically. The adiabatic equations for calculating the minimum conductor size to withstand the short circuit are explained.
ELEK Software Vehicle Charging Station 1170x585 - Articles - Low Voltage Design
3 mins read

Touch Voltage Calculations for LV Electrical Systems

The definition of “touch voltage” is the voltage between accessible exposed and extraneous conductive parts that may lead to the risk of electric shock in the event of an electrical fault. This article covers AS/NZS 3000, BS 7671, and NFPA 70E rules concerning touch voltages and provides the equations for calculations.
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