Learn how to size cables using NEC (NFPA 70) with step-by-step calculation examples, including ampacity, voltage drop, OCPD, and EGC sizing.

Learn how to set priorities and adjust protective devices for selective coordination to isolate faults and minimise outages in electrical systems.

Learn how to set and coordinate circuit breakers to meet AS/NZS 3000:2018, ensuring faults are isolated quickly and safely in electrical systems.

Size active, neutral, and earth cables using AS/NZS 3008. The guide covers current capacity, voltage drop, and short-circuit calculations with examples.

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.

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.

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.

Equations for calculating conduit sizes and space factors in accordance with standards are provided. Worked examples of conduit sizing calculations are provided.

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.