Recommended References on Arc Flash
What is Arc Flash? Arc flash is a type of electrical explosion or discharge that occurs when a fault condition bridges the air gap between energized conductors or between an …
IEC 62305 – Protection against lightning
Lightning is a very high-energy phenomenon. Lightning protection is oftentimes taken for granted as the probability of a lightning strike to a structure is low, and damage to properties and …
Protection Against Electric Shock – Indirect Contact
IEC 60364-4-41 Electrical installations of buildings – Part 4-41: Protection for safety – Protection against electric shock has provided several measures of protection against indirect contact listed as follows: Automatic …
Introduction to Harmonics
Technology advancement has its pros and cons. Computers increase the efficiency of doing everyday office jobs. Most companies now have the policy of paperless office which is good for the …
Calculating Flash Protection Boundary Distances
In NFPA 70E, the short-circuit symmetrical ampacity from a bolted 3-phase fault at the transformer terminals is calculated with the following formula: where Isc = Amperes, V = Volts, %Z …
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 …