Non-hazardous Area – IEC 60079
IEC 60079 is concerned with the classification of areas where flammable gas or vapour or mist hazards may be present. The classification may be used as a basis to support …
Resistance of Earth Electrodes in Parallel
In previous articles Single Earth Electrode and Earthing Resistance Calculation, I have presented methods of calculating the earth resistance using IEEE or IEC methods. AS 1768 Appendix C recommends that …
Motor Cable Selection Chart Explained
Important: Please note that any materials presented herein is subject to the conditions of the disclaimer of this site. I am receiving a significant number of enquiries on how to …
Filipinos Among the Victims in Gulf of Mexico Oil Rig Explosion
There were fifteen Filipino OFWs out of the 22 personnel working of the ill-fated oil rig in the Gulf of Mexico. That is the second explosion in the area in …
Low Voltage Fuses Applications
Despite the advancement of re-settable circuit protection devices, fuses are here to stay. In some applications, fuses are irreplaceable particularly in high current limiting or fast fault-current interruption applications. Fuses …
IEC 60364-56 Safety Services (Emergency Systems)
Safety service is defined in IEC 60364-56 as an electrical system for electrical equipment provided to protect or warn persons in the event of a hazard, or essential to their …