**International System of Units (SI System)**
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...

**Fault Calculation - Per Unit System**
Per unit fault calculations is a method whereby system impedances and quantities are normalised across different voltage levels to a common base. By removing...

**1,000 kV UHV First for China**
At the beginning of the year China put the world's first 1,000 kV UHV transmission system into operation. Transmitting power at over a million volts is...

**Introduction to Lighting**
When looking at the design of a lighting scheme it is useful to have an understanding on the nature of light itself and some of the basic theory associated...

**IEC Document Designation**
Often document control is dictated by project requirements, for example a particular organisation may have an existing numbering system. Existing company...

**Maxwell's Equations - Introduction**
Maxwell's Equations are a set of fundamental relationships, which govern how electric and magnetic fields interact. The equations explain how these fields...

**Voltage Drop in Installations - Concepts**
Problems on achieving maximum voltage drop within an installation come up often. Depending where you live, local regulations will have different limits...

**Fault Calculation - Symmetrical Components**
For unbalance conditions the calculation of fault currents is more complex. One method of dealing with this is symmetrical components. Using symmetrical...

**Paths of Flight**
GE have put together a time-lapse video shown flight take-off and landings at some airports. An interesting view:

**Motor Insulation**
Insulation on a motor prevents interconnection of windings and the winding to earth. When looking at motors, it is important to understand how the insulation...