Arc-Flash Hazards
An arc-flash is a release of energy caused by a flow of fault current through an electrical arc plasma. Arc flashes can occur when racking a breaker in/out, removing a …
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 …
Arc Flash Incident – 13.8 kV Indoor Switchgear Part II
Accumulation of moisture inside the 13.8 kV main bus and insulation tracking caused another arc-flash incident on the 13.8 kV Indoor Switchgear. An annual preventive maintenance was scheduled prior to …
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 …
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 …
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 …