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 lot of our members work in countries where PPE (personal protective equipment) is regulated or they work for companies/organizations which take employee...

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...

This is the first of two posts on the resistance of conductors. In the next post I will look at the ac resistance, including skin effect and we deal with...

If you are working on a large plan, get the real coordinates [latitude, longitude] for two or more points and add them to the drawing. That way you can...

MIT OpenCourseWare, makes the materials used in teaching all MIT subjects available on the Web, free of charge, to any user in the world.

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

Fault calculations are one of the most common types of calculation carried out during the design and analysis of electrical systems. These calculations...

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

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...