IEC 61439 'Low-voltage switchgear and controlgear assemblies', specifies standard arrangements of switchboard (call forms of internal separation). The...

Capacitors have numerous applications in electrical and electronic applications.  This note examines the use of capacitors to store electrical energy....

Our cable sizing tool is one of the more popular tools on the site.  The tool enables cables to be sized in compliance with BS 7671 (the IEE Wiring Regulations...

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

Collection of links to various places with useful motor information. I’ll try and return to the page every now and again to update it with any motor notes...

Electrical notes are a collaborative collection of electrical engineering information and educational material. Any registered user can add content. ...

Over the past year or so I've been involved in on going discussions related to referring fault levels from the secondary of a transformer to the primary...

The standard aims to consolidate AC and traction voltages within the industry and defines the following bands: band 1 - A.C. systems 100 V to 1...

Various techniques exist to enable the correct selection of batteries for UPS applications.  The procedure described below is one of the more common. ...

Depending where in the world you work, you are likely following one of two standards International Electrotechnical Commission (IEC) National...