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Electrical Safety and LOTO Flashcards

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

Read the first 6 Electrical Safety and LOTO flashcards as text

  1. Under OSHA 1926.416, what minimum clearance must be maintained from overhead energized power lines rated at 50 kV or below when using equipment on a construction site?

    Answer: 10 feet

    OSHA 1926.416(a)(1) and OSHA 1926.600 require a minimum clearance of 10 feet from any part of a tool, equipment, or machinery to overhead power lines rated at 50 kV or less.

  2. What is the primary purpose of Lockout/Tagout (LOTO) procedures under OSHA 29 CFR 1910.147?

    Answer: To control hazardous energy and prevent the unexpected energization or release of stored energy during servicing and maintenance

    OSHA 1910.147 establishes LOTO as the procedure for controlling hazardous energy — electrical, mechanical, hydraulic, pneumatic, chemical, thermal — to protect workers during equipment servicing and maintenance.

  3. Ground Fault Circuit Interrupters (GFCIs) are required by OSHA on construction sites. How quickly does a GFCI interrupt a circuit when a fault is detected?

    Answer: Within 1/40th of a second (approximately 25 milliseconds)

    GFCIs are designed to trip within 1/40th of a second (approximately 25 milliseconds) when they detect a ground fault of 5 milliamps or more, fast enough to prevent electrocution.

  4. Under OSHA 1926.404, an Assured Equipment Grounding Conductor Program (AEGCP) is an alternative to GFCIs. How often must cord sets and equipment be visually inspected under an AEGCP?

    Answer: Before each day's use

    Under an AEGCP, cord sets, receptacles not part of a building's wiring, and equipment connected by cord and plug must be visually inspected for external defects before each day's use.

  5. What PPE is required when working on energized electrical systems with exposed live parts above 50 volts?

    Answer: Rubber insulating gloves rated for the voltage level, worn with leather protectors

    NFPA 70E and OSHA require rubber insulating gloves rated for the voltage level being worked on, worn with leather protectors to prevent mechanical damage, when working on energized electrical parts.

  6. Which electrical hazard involves a sudden release of energy from an unintended arc path that can produce temperatures up to 35,000°F and cause severe burns?

    Answer: Arc flash

    Arc flash is a sudden release of energy caused by an electrical arc, producing intense heat, pressure waves, and molten metal that can cause severe burns even at low voltages.