Compliance to Statutory Laws
I was reminded of this article which I have written about two (2) years ago when I attended some product presentations about variable speed drives. What catch my attention most …
IEC 60076-5 Transformer Impedances
IEC 60076-5:2000 Power transformers – Part 5: Ability to withstand short circuit recommends a minimum impedance for transformers. Unlike other standards such as the IEEE or AS which recommends typical …
Grounded or Grounding Conductors
The NEC and PEC define and identify grounded conductor and grounding conductor differently. To understand better, here are the definitions on these electrical codes: Definitions: Grounded Conductor. A system or …
PEC, NEC, IEC Grounded/Earthed Conductors
If you have been working with IEC standards or its derivative standards like the AS, it will be strange for you to learn that NEC and a derivative standard like …
PEC Enforcement – Alternative Methods
Is it possible to use International Standards such as IEC 60364 and NFPA 70 in the Philippines? In Clause 1.0.1.4.a of the PEC Edition 2009 states that, (c) The authority …
Oil-immersed Transformers – Methods of Cooling
Oil-immersed transformer cooling methods are consistent on both the IEC and IEEE. This designation is one of the few that is the same for both standards. Oil-immersed transformer cooling method …