Arc-flash – hazards, mitigations and standards
What is Arc-Flash? Arc-Flash is a type of electrical explosion that occurs when an electrical current leaves its intended path and travels through the air from one conductor to another …
Ventilation Requirements for Stationary Battery Rooms
Almost always, stationary battery rooms ventilation is an argument among engineers. However, seldom do their reasoning are based on scientific evidence to prove their position. IEC std 62485 provides a …
Hazards of Insufficient Short-Circuit Current Rating according the Philippine Electrical Code 2017 Edition
What is Short-Circuit Current Rating? The Philippine Electrical Code 2017 defines Short-Circuit Current Rating as the prospective symmetrical fault current at a nominal voltage to which an apparatus or system …
IEEE Std 80 Step Potential and Touch Potential Calculation
Potential Hazards Step potential is the voltage difference between the feet of a person near an energized, grounded object. A person on the ground is subjected to the risk of …
CAUTION! Do not mix LV and ELV in Multicore Control Cable
Mixing low voltage (LV) and extra-low voltage (ELV) control voltages in a multicore cable is a common mistake committed by inexperienced design engineers. Combining these control voltages may look good …
History of Earthing / Grounding
When Thomas Alva Edison started his electric illuminating company and began the electrical distribution system, he used only one insulated (from earth) conductor and the earth for the return conductor. …