Safety Against Overvoltages

Overvoltages are unwanted potentials occurring in electrical systems between a phase conductor and the earth or ground, or between phase conductors having a peak value greater than the peak of the largest nominal or RMS…

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),…

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…

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