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Question 1
According to OSHA 29 CFR 1910.333, what is the minimum approach distance an unqualified worker must maintain from exposed energized parts operating at 50 volts or more?
Answer: An unqualified worker must stay outside the Limited Approach Boundary, which requires they not cross into the space where there is an increased risk of shock. They must remain at a distance that prevents inadvertent contact, as specified by the employer's Energized Electrical Work Permit.
Question 2
Under OSHA standards, at what voltage level do electrical hazards become regulated and require protective measures for workers?
Answer: OSHA regulations for electrical safety begin at 50 volts. Below 50 volts, the risk of harmful electric shock is generally considered negligible under normal conditions.
Question 3
What does OSHA 29 CFR 1910.147 govern, and what is its common name?
Answer: OSHA 29 CFR 1910.147 governs the control of hazardous energy during servicing and maintenance of machines and equipment. It is commonly known as the Lockout/Tagout (LOTO) standard.
Question 4
What is the correct sequence of the six steps in a Lockout/Tagout procedure?
Answer: The six steps are: (1) Notify affected employees, (2) Identify all energy sources, (3) Shut down the equipment, (4) Isolate all energy sources, (5) Apply lockout/tagout devices, and (6) Release or restrain stored energy, then verify zero energy state.
Question 5
What is the key difference between a lockout device and a tagout device?
Answer: A lockout device physically prevents the operation of an energy-isolating device using a lock. A tagout device is only a warning label that does not physically prevent re-energization, making lockout the preferred and more secure method.