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 …
Lightning Protection – Rolling Sphere Method Accordning to Philippine Electrical Code 2017 Edition
Rolling Sphere Method The Rolling Sphere Method is a popular and acceptable method of implementing lighting protection on structures. In the Philippine Electrical Code, the rolling sphere method is mentioned …
IEEE Std 3002.8 – IEEE Recommended Practice for Conducting Harmonic Studies and Analysis of Industrial and Commercial Power Systems
Introduction This guide discusses the basic concepts involved in studies of harmonic analysis of industrial and commercial power systems. The need for such an analysis, recognition of potential problems, corrective …
Voltage Levels – IEC 61000-3-6
As far as I know, IEC has not mentioned medium voltage in any of its standards except in IEC 61000-3-6. The following table provides the different voltage levels as per …
Asynchronous (Induction) Motor Data – IEC 60909
Design engineers most of the time will refer to induction motor manufacturer’s data as an input to their design. This practice is totally acceptable. In the absence of a manufacturer’s …
Circuit Breaker Utilization Categories (IEC 60947-2)
Utilization category (for a switching device or a fuse) is defined in IEC 60947-1 as the combination of specified requirements related to the conditions in which the switching device or …