Variable frequency drives are widely used to control the speed of ac motors.  This note looks at the mechanisms which enable drive units to control the...

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

When sizing cables nearly, everyone uses some form of software. This ranges from homespun spreadsheets to complex network analyses software. Each has its...

Low voltage (LV) switchrooms are common across all industries and one of the more common spatial requirements which need to be designed into a project...

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...

The European Union is implementing a voluntary code of practice for participants with the aim of improving the overall efficiency of data centres. As part...

One of the comments on my Motor Starting Series was asking for something on duty cycles. Here it is. As a purchaser of a motor, you have responsibility...

When selecting a cable, the performance of the cable under fault conditions is an important consideration. It is important that calculations be carried...

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.

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...