IEEE


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…


Arc Flash – Incident Energy at Working Distance

From the previous article, the arcing current Ia was calculated from the bolted fault current. With the arcing current already known, the incident energy can then be calculated. To determine the incident energy using the…


Arc Flash – Calculating Arcing Current

Arcing current is used to calculate the incident energy from an arc flash. The predicted three-phase arcing current, which is lower than the bolt fault current, must be determined so that operating time for protective…


Philippine Electrical Code – Low Voltage

Low Voltage is mentioned many times in the Philippine Electrical Code (PEC). However, the PEC failed to explicitly include Low Voltage in the definition of terms. The purpose of the PEC, being a statutory document,…



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