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Electrical Safety and LOTO Flashcards

7 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 7 Electrical Safety and LOTO flashcards as text

  1. When must a LOTO periodic inspection be performed, and what must it include?

    Answer: At least annually; a review of the procedure with each authorized employee

    OSHA 29 CFR 1910.147(c)(6) requires LOTO procedures to be inspected at least annually and reviewed with each authorized employee who uses the procedure.

  2. A construction electrician is working on a 480V motor control center. After locking out the breaker, what is the next critical step before touching conductors?

    Answer: Test for absence of voltage using an appropriate voltage tester

    After lockout, workers must verify zero energy state by testing with a voltmeter or tick tracer rated for the voltage before touching any conductors.

  3. Which type of stored energy must be addressed during LOTO on a hydraulic press in addition to electrical lockout?

    Answer: Pneumatic, hydraulic, gravitational, and spring (mechanical) energies

    LOTO must address all forms of hazardous energy including electrical, pneumatic, hydraulic, gravitational, thermal, and mechanical (spring) energy.

  4. On a construction site, temporary wiring must be protected by GFCIs or an assured equipment grounding conductor program (AEGCP). Under the AEGCP, how frequently must receptacles be tested?

    Answer: Before first use, after repairs, and at 3-month intervals

    OSHA 1926.404(b)(1)(iii) requires AEGCP receptacles to be tested before first use, after repairs, and at 3-month intervals.

  5. What is the purpose of a 'try-out' (or test) step after applying lockout to a machine?

    Answer: To verify the machine cannot be started before work begins

    The try-out step verifies the energy isolation was successful by attempting to start or operate the equipment before performing maintenance.

  6. A new subcontractor arrives on site and will work near but not on equipment that is under lockout. What category does this worker fall under per OSHA 1910.147?

    Answer: Other employee

    Workers who are not involved in servicing the equipment and not required to operate it are classified as 'other employees' and must be trained on the purpose and prohibition of LOTO.

  7. Which OSHA standard specifically governs electrical safety requirements for construction, including grounding and wiring design?

    Answer: 29 CFR 1926.400 through 1926.449

    Subpart K of 29 CFR 1926 (sections 1926.400–1926.449) covers electrical safety standards specifically for the construction industry.