Resistance of a Single Earth Electrode
The resistance of a single earth can be calculated if the soil resistivity is known. An earth rod driven vertically, the electrode resistance can be calculated using the following formula. …
Standards and Statutory Laws
What do NFPA 70 and AS/NZS 3000 have in common? The former is National Electrical Code (U.S.) and the later is the Wiring Rules (Australia and New Zealand). Both are …
IEC Equipment Voltages
There are two (2) voltage levels used in IEC, low voltage ( < 1000 V ) and high voltage ( > 1000 V ). Medium voltage, inspite being oftenly used …
IEEE and IEC Interface
A project dealing only with either IEEE or IEC standards is not an issue. If there will be mix standards within a single project, then compliance becomes an issue. In …
Tips on Effective Design
As an Electrical Engineer working on a global scope, knowledge on International Electrical Standards such as the IEC and the IEEE is an advantage. This is just the start though, …
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 …