Practice Test Geeks(STSC) Safety Trained Supervisor Construction Practice Test
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Electrical Safety in Construction Flashcards

7 cards from real STSC 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 in Construction flashcards as text

  1. What does the 'one-hand rule' recommend when workers must work near energized electrical panels?

    Answer: Keep one hand in a pocket or behind your back to prevent current from crossing the chest

    The one-hand rule reduces the chance of current passing through the heart by keeping one hand away from any grounded surface when working near energized parts.

  2. Under OSHA 1926.405, what is the maximum length of flexible cord that may be used as a substitute for permanent wiring on a construction project?

    Answer: Flexible cord may never be used as a substitute for permanent wiring

    OSHA prohibits using flexible cord or extension cords as a substitute for the fixed wiring of a structure under any length restriction.

  3. Which instrument should a qualified electrician use to verify that a circuit is de-energized before beginning work under LOTO?

    Answer: A non-contact voltage tester or voltmeter rated for the circuit voltage

    A non-contact voltage tester or voltmeter rated for the expected voltage confirms de-energization; ohm and continuity testers cannot safely detect live voltage.

  4. A construction crew is working inside a steel structure during a thunderstorm. Lightning strikes a nearby tower and induces a surge on the site's temporary power system. Which protective device is specifically designed to limit damage from this type of transient overvoltage?

    Answer: Surge protective device (SPD)

    Surge protective devices (SPDs) clamp transient overvoltages caused by lightning or switching surges, protecting equipment and wiring from insulation breakdown.

  5. What condition classifies a work location as a 'wet location' for purposes of electrical equipment selection on a construction site?

    Answer: A location subject to saturation with water or other liquids

    OSHA and the NEC define a wet location as one exposed to weather or subject to saturation by water, which requires equipment rated for wet location use.

  6. Which of the following is NOT an acceptable method to protect workers from overhead power line contact when using a crane on a construction site?

    Answer: Posting a spotter to watch only the load swing

    A spotter alone watching only the load is insufficient; OSHA requires the spotter to observe clearance from power lines specifically and have authority to stop operations.

  7. An employee receives an electric shock and is in contact with an energized conductor. What is the supervisor's correct first action?

    Answer: De-energize the circuit or use a non-conductive object to separate the victim from the source

    The rescuer must first break contact without touching the victim directly — by cutting power or using a non-conductive object — to avoid becoming a second victim.