Cathodic Protection and Earthing
Cathodic protection and earthing are two different topics belonging to the opposite sides of the spectrum. The implementation and principles are actually different. To simply illustrate what I mean, for …
Effects of Unbalance Voltage on Induction Motors
Unbalance phase voltages on a three (3) power system produce negative sequence components of the voltage. Even a small voltage unbalance will result in large current unbalance during the running …
Voltage Drop Calculations
In 2008, I have written some articles on voltage drop calculations as a tool in the selection of the correct cable sizes. Voltage Drop Calculation; Voltage Drop Calculation Part 2; …
Don’t Get Giddy, Be Firm!
I pity the engineers who use data in their design without prior verification. In simple terms, they do not know what they are doing. Secondly, if someone will ask them …
As An Engineer, Do You Trust Your Vendors?
It is difficult to comprehend but gone are the days when Engineers perform their design calculations prior to asking vendor quotations. Several decades ago, when computers are only for the …
Insulation Coordination – Why is it required?
What is insulation coordination and what is its importance? There are many definitions of insulation coordination provided by different authorities. In this instance we wanted to use IEC 60071-1 definition …