Illuminance recommendations

Recommended minimum illuminances (E) for typical interior lighting tasks. The illuminances are aimed at a lighting level appropriate to the specific visual tasks to be performed in the space or… Read more

Sep 10, 2011 | Edvard

What Is a Load Break Switch?

A load break switch is a disconnect switch that has been designed to provide making or breaking of specified currents. This is accomplished by addition of equipment that increases the… Read more

Sep 08, 2011 | Edvard

Oil-Filled Equipment in Substation – IEEE 980-1994 (R2001)

A number of electrical apparatus installed in substations are filled with oil that provides the necessary insulation characteristics and assures their required performance. Electrical faults in this power equipment can… Read more

Sep 07, 2011 | Edvard

AIS – Air insulated substations

In large, modern AC power systems, the transmission and distribution systems function to deliver bulk power from generating sources to users at the load centers. Transmission systems generally include generation… Read more

Sep 06, 2011 | Edvard

Animal deterrents and security in substation

The vast majority of electrical utility substations designed to transform transmission voltages to distribution class voltages employ an open-air design. The configurations may vary, but usually consist of equipment that… Read more

Sep 05, 2011 | Edvard

Ohm’s Law – The Resistance

It is intuitive that voltage and current would be somehow related. For example, if the potential difference between two ends of a wire is increased, we would expect a greater… Read more

Sep 02, 2011 | Edvard