OSHA 30hr Construction: 14 - Arc Flash and Electrical Safety Best Practices (NFPA 70E 2024) Well Arranged

OSHA 30hr Construction: 14 - Arc Flash and Electrical Safety Best Practices (NFPA 70E 2024) Well Arranged What is arc flash? -ANS-Arc flash is the visual electrical light and heat that occur during an arc fault What's the minimum voltage at which serious electric shock can occur? -ANS-50 volts What determines the severity of injury in arc flash? -ANS-The available current and duration of the arc flash What injuries are associated with electric shock? -ANS-A. Electrocution B. Suffocation C. Tissue and organ damage D. All of the above - Correct Answer How are arc flash and electric shock protection boundaries determined? -ANS-Qualified workers use NFPA 70E boundary tables or the employer's safe work practices tables to determine arc flash and shock protection boundaries. What is an arc flash protection boundary? -ANS-The distance from energized equipment at which a worker, unprotected by proper PPE, would sustain burns less than those from a mild sunburn What constitutes an "electrically safe condition"? -ANS-Equipment is locked and tagged in a de-energized position and then tested to ensure there is no stored or protentional energy Who can enter limited and restricted boundaries? -ANS-Electrically-qualified workers and those undergoing on-the-job training with demonstrated ability to safely perform the required task What general skills must electrically-qualified workers have to perform their jobs? -ANS-A. Knowledge and training to perform one or more specific duties