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Electrical Safety Practices Flashcards

7 cards from real IEC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Electrical Safety Practices flashcards as text

  1. When working on energized electrical equipment, which OSHA standard specifically governs electrical safety for general industry?

    Answer: 29 CFR 1910.333

    OSHA 29 CFR 1910.333 covers safety requirements for working on or near live parts in general industry electrical installations.

  2. What is the minimum approach distance for a qualified worker working on uninsulated 4kV conductors?

    Answer: 2 feet 2 inches

    NFPA 70E Table 130.4(D)(a) specifies a minimum approach distance of 2 feet 2 inches for uninsulated conductors at 4.0 kV.

  3. Which type of glove is rated for use on circuits up to 26,500 volts AC?

    Answer: Class 2

    Class 2 rubber insulating gloves are rated for use on circuits up to 17,000 volts AC (proof-tested to 20,000V), while Class 3 covers up to 26,500V.

  4. An arc flash boundary is the distance at which an unprotected worker would receive a second-degree burn from an arc flash incident energy of:

    Answer: 1.2 cal/cm²

    The arc flash boundary is defined as the distance at which incident energy equals 1.2 cal/cm², the threshold for a just-curable second-degree burn.

  5. What does the term 'qualified person' mean in the context of electrical safety per OSHA standards?

    Answer: A person trained and knowledgeable in construction and operation of electrical equipment and hazards

    OSHA defines a 'qualified person' as one trained and knowledgeable about the construction and operation of equipment and the hazards involved.

  6. When must a lockout/tagout procedure be re-verified after it has already been established?

    Answer: When the work scope changes or new hazardous energy sources may have been introduced

    Lockout/tagout must be re-verified whenever the scope of work changes or new energy sources may have been introduced to the isolation.

  7. Which condition allows an electrician to use an energized electrical work permit under NFPA 70E?

    Answer: De-energizing creates a greater hazard or is infeasible due to equipment design or operational limitations

    An energized electrical work permit is required when de-energizing creates a greater hazard or is infeasible due to equipment design or operational limitations.