The calculation of current in a three phase system has been brought up on our site feedback and is a discussion I seem to get involved in every now and...

It starts with me reading one of the Horrible History books with my son (Groovy Greeks). Arrows were mentioned which lead to the discussion of the bodkin...

The IEC publishes a series of documents and rules governing the preparation of documents, drawings and the referencing of equipment.   Depending on country...

The following tables provide quick order of magnitude fault levels for a a range of typical low voltage situations.

Following on from my post on railway electrification voltages, I thought an introduction to traction substations would be a good idea. Traction substations...

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

A recurring theme on our forums is cable sizing. Now many installations are unique and require special consideration. However, a lot of the time things...

Sometimes it’s useful to be able to quickly lookup a piece of technical information.  This note is a collection of information related to motors, and in...

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

Coils of wire on the rotor carry a d.c. current which generates a magnetic field. A stator magnetic field is created using either permanent magnets or...