This article gives an introduction to IEEE 485 method for the selection and calculation of battery capacity.

The correct sizing of current transformers is required to ensure satisfactory operation of measuring instruments and protection relays. Several methods...

The International System of Units (abbreviated SI) is the world's most widely used system of units.  The system consists of a set of units and prefixes...

When sizing cables, the heat generated  by losses within any sheath or armour need to be evaluated. When significant, it becomes a factor to be considered...

Power cables can basically be classified into earthed and unearthed cables, where earthed and unearthed refer to the application for which the cable is...

Traditionally generation of electricity has involved rotating machines to produce alternating sinusoidal voltage and current (a.c. systems). With the development...

Most installations involve some form of lightning protection system which is connected to an earth electrode.  The function of the earth electrode is to...

For unbalance conditions the calculation of fault currents is more complex. One method of dealing with this is symmetrical components. Using symmetrical...

Years ago I was told that you should always try to write the best report you can.  Many years later I still think on this as one of the better pieces of...

This post is quick introduction and overview to different railway electrification voltages used in answer to a question sent in via email. While there...