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Electrical Safety Flashcards

7 cards from real ISC 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 flashcards as text

  1. Before touching circuit parts thought to be de-energized, a qualified worker tests them with a voltage tester. What must also be done with the tester under OSHA 1910.333?

    Answer: Check that it works on a known live source before and after the test

    Checking the tester on a known source before and after the test proves the meter did not fail and give a false 'dead' reading.

  2. Under NFPA 70E, when may an unqualified person cross the limited approach boundary of exposed energized conductors?

    Answer: Only when a qualified person advises them and escorts them the whole time

    NFPA 70E lets unqualified persons enter the limited approach space only when a qualified person continuously escorts them and tells them about the hazards.

  3. The arc flash boundary is the distance from an arc source at which the incident energy equals what value?

    Answer: 1.2 cal/cm²

    1.2 cal/cm² is about the energy that causes the onset of a second-degree burn on bare skin, so it sets the arc flash boundary.

  4. An unqualified worker is operating near an overhead line rated 50 kV or less. What minimum clearance does OSHA require?

    Answer: 10 feet

    OSHA 1910.333(c)(3) requires unqualified persons to stay at least 10 feet from overhead lines of 50 kV or less.

  5. At about what ground-fault current level is a Class A GFCI designed to trip?

    Answer: About 5 milliamperes

    Class A GFCIs trip at around 4–6 mA, which is below the level that causes serious harm to most people.

  6. For equipment of 600 V or less, what is the minimum depth of working space OSHA requires in front of electrical equipment that may be examined or serviced while energized?

    Answer: 3 feet

    OSHA 1910.303(g) requires a minimum working-space depth of 3 feet (0.9 m) for systems of 600 V or less.

  7. What is the main safety purpose of the equipment grounding conductor in a circuit?

    Answer: To provide a low-impedance path for fault current so the overcurrent device trips

    The equipment grounding conductor carries fault current back to the source so a breaker or fuse opens quickly and the metal case doesn't stay energized.