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 …
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 …
The first edition of the PEC published in 1962 by PAMEE was an adaptation of the NEC customized to suit the local Philippine environment. Several decades later and the PEC …
The calculation of maximum and minimum short-circuit currents as per IEC 60909 is based on the following assumptions. No change in the type of short circuit involved, that is, a …
The sizes of earth conductors and earth electrodes are almost always chosen from typical sizes as provided by a particular project standard. If using non-typical sizes can extensively impact the …
There are two (2) voltage levels used in IEC, low voltage ( < 1000 V ) and high voltage ( > 1000 V ). Medium voltage, inspite being oftenly used …