Conductor Stranding – IEEE vs IEC Standards
Important Notes: A conductor size expressed in mm² shall be IEC standard and sizes in AWG or kcmil shall be IEEE standard. PEC standard conductors are similar to IEEE standards …
International Standards as PEC Alternatives in Electrical Installation in the Philippines
Is it possible to use International Standards such as IEC 60364 and NFPA 70 for electrical installations in the Philippines? International Standards such as IEC 60364 and NFPA 70 are …
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 …
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 …
Why The PEC Needs to Adapt IEC
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 …
Calculation of Maximum and Minimum Short-circuit Currents
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 …