In three phase systems, the use of transformers with three windings (or legs) per side is common.  These three windings are often connected in delta or...

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...

A single phase system is perhaps the most common type of system most people are familiar with. This is what people have in their homes and what appliances...

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...

We have had the Wiki with us for a long time now, but at last I have decided to say bye bye – more details on why below.

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

The new standard IEC 61439 replaces the old 60439. Compared to the old standard, the new 61439 is a more clearly defined and takes into account the assembly...

Various arguments exist around SF6 Gas Insulated (GIS) and Air Insulated (AIS) medium voltage switchgear. Recently we had to change a GIS design to AI...

The widely used United Sates standard ANSI/IEEE C37.2 'Electrical Power System Device Function Numbers, Acronyms, and Contact Designations' deals with...

Cable insulation is used to provide electrical separation between conductors of  a cable.  During the historical development of cables, numerous types...