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Electrical Safety and LOTO Flashcards

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  1. What does the term 'incident energy' mean in the context of arc flash safety?

    Answer: The amount of thermal energy impressed on a surface at a specific distance from an arc flash

    Incident energy is the amount of thermal energy, measured in cal/cm², that could be imposed on a worker at a specific working distance during an arc flash event.

  2. Which NFPA standard governs electrical safety in the workplace and arc flash PPE requirements?

    Answer: NFPA 70E

    NFPA 70E, 'Standard for Electrical Safety in the Workplace,' specifically addresses arc flash hazard analysis and the selection of appropriate PPE for energized electrical work.

  3. What is the 'flash protection boundary' defined by NFPA 70E?

    Answer: The distance at which an unprotected person could receive a second-degree burn from an arc flash

    The flash protection boundary is the distance from an arc source at which a person without PPE could receive a just-curable second-degree burn (1.2 cal/cm²) from an arc flash.

  4. A safety supervisor finds an employee working on an energized panel without wearing proper arc flash PPE. What is the FIRST action to take?

    Answer: Immediately stop the work and ensure the employee puts on appropriate PPE or de-energizes the equipment

    Immediate hazard abatement is always the first priority — stop the unsafe work immediately to prevent potential injury before addressing administrative steps.

  5. What is the purpose of an Energized Electrical Work Permit (EEWP)?

    Answer: To document justification, hazard analysis, and safety precautions for working on energized equipment when de-energization is infeasible

    An EEWP documents why the work cannot be de-energized, identifies the hazards, specifies required PPE and safe work practices, and requires management approval before energized work begins.

  6. Which PPE item is considered the FIRST line of protection against electrical arc flash hazards?

    Answer: Arc-rated clothing (flame-resistant garments)

    Arc-rated (flame-resistant) clothing is the foundational protection layer because it prevents clothing ignition, which is the leading cause of burn fatalities in arc flash incidents.

  7. What OSHA standard specifically covers electrical safety requirements for general industry (non-construction) workplaces?

    Answer: 29 CFR 1910.301–399 (Subpart S)

    OSHA 29 CFR 1910 Subpart S (sections 1910.301 through 1910.399) contains the electrical safety standards for general industry workplaces.