Concrete-Encased Earthing Electrode
Electrical Engineers may sometimes face some issues on how to implement proper earthing (grounding) on a project. This is a predicament I encountered on a water pipeline project in Sunshine …
NEMA Design Letters of Polyphase Squirrel-Cage Induction Motors
As per NEMA Standard MG-1, polyphase squirrel-cage induction motors may be one of the following. The four NEMA (National Electrical Manufacturers Association) designs have unique speed-torque-slip relationships – making them …
Voltage Classes – ANSI vs IEC
As Electrical Engineers, we deal with voltages almost every day in our lives. Sometimes, voltages levels or voltage classes are a bit confusing not only for us but for other …
How to Protect Your House and Its Contents from Lightning
This IEEE Guide for Surge Protection of Equipment Connected to AC Power and Communication Circuits. Authors: Richard L. Cohen Doug Dorr James Funke Chuck Jensen S. Frank Waterer Surge protection …
Protection Against Electric Shock
Electric Shock Electric shock is defined as a dangerous physiological effect resulting from the passage of electric current through a human body or livestock. A useful reference document is British …
Branch Circuit Maximum Loads according to Philippine Electrical Code 2017 Edition
The Philippine Electrical Code has specific provisions on the total load of a branch circuit that is required to be complied in any electrical installation. Section 2.20.2.9 is specific on …