When they’re considering earth (ground) testing, people often ask about what type of test leads they should use. Typically, they ask questions about the type of wire, the resistance of the leads, the length of the leads, and voice their safety...

Though not nearly as well-known as Edison and Marconi, Ernst Alexanderson is nevertheless one of the most important inventors of the last century. He is credited with 344 patented inventions, ranging from variable speed AC motors to a whole host of devices...

Since the 1950s, vacuum has been used as an insulating medium in switchgear. The technology has proved to be very reliable but even so, over time air will inevitably leak into vacuum interrupters and degrade the insulation. It is, therefore, essential to...