Safety

Arc Flash Incident – 13.8 kV Indoor Switchgear

An indoor 13.8kV Vacuum Circuit Breaker switchgear has an arc flash incident this week. Investigation results showed that the wet weather increased the humidity inside the switchroom, incomplete covering of bus bar joints (as-built condition),…

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Objectives of Grounding System

To ground or not to ground is a decision that an Electrical Engineer needs to make when planning or modifying an electrical power distribution system. The decision is dependent on the requirement of the loads….


Arc Flash – Simplified Two-Category Clothing

The 2015 edition of NFPA 70E has a simplified approach to provide minimum PPE for electrical workers within facilities with large and diverse electrical systems. The simplified clothing categogies listed in NFPA 70E 2015 Table…


Electrical Engineers – Do you really care?

I went to the office of Department of Labor and Employment Region 4A (CALABARZON) in Calamba, Laguna to accompany a friend. I noticed that the meter bank for the building looks like a mess and…


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Arc Flash Equipment Labeling Requirement

Equipment labeling requirement for arc-flash were initially introduced in NEC 2002 and later in NFPA 70E 2009.Since then, it has become a norm not only in North America but in other countries where safety is…


Why We Perform A VLF Test?

ATE has provided a very good reasons on this article why high voltage withstand tests on cables are necessary. Past practices involved HVDC Hi-pot or DC leakage current methods. They not only provide insufficient diagnostic…


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