CSS - Certified Safety Supervisor Electrical Safety and LOTO Questions and Answers 1 — Questions and Answers
Question 1: A supervisor is assigning roles for a major repair on a conveyor system. One employee will be performing the actual maintenance requiring lockout, and several others work on the production line that the conveyor feeds. In the context of Lockout/Tagout (LOTO), how are these employees classified according to OSHA 29 CFR 1910.147?
- The maintenance employee is an 'affected employee' and the others are 'authorized employees.'
- All employees are considered 'other employees' and must stay clear of the area.
- The maintenance employee is an 'authorized employee' and the others are 'affected employees.' (Correct answer)
- The maintenance employee is a 'qualified person' and the others are 'competent persons.'
Correct answer: The maintenance employee is an 'authorized employee' and the others are 'affected employees.'
According to OSHA 29 CFR 1910.147(b), an 'authorized employee' is a person who locks out or tags out equipment to perform servicing or maintenance. An 'affected employee' is one whose job requires them to operate the equipment on which servicing is being performed or to work in the area. Therefore, the maintenance employee performing the work is authorized, and the production line workers are affected.
Question 2: A team of three mechanics is preparing to perform a complex overhaul on a large industrial press. As the safety supervisor, which of the following actions is a primary requirement for a compliant group lockout procedure?
- A single lock is applied by the lead mechanic on behalf of the entire group.
- Each authorized employee affixes their personal lockout device to the group lockbox or hasp. (Correct answer)
- The supervisor is the only person permitted to hold the key to the group lockbox.
- The procedure can be skipped if all mechanics are in constant visual contact with the main disconnect.
Correct answer: Each authorized employee affixes their personal lockout device to the group lockbox or hasp.
OSHA's group lockout standard, 29 CFR 1910.147(f)(3), requires that each authorized employee has personal control over the hazardous energy. This is achieved when each employee attaches their own personal lockout device to a group lockout mechanism, such as a lockbox or hasp, ensuring the equipment cannot be re-energized until every individual has completed their work and removed their personal lock.
Question 3: An electrical panel must be opened for diagnostic testing while energized. According to OSHA standards, which of the following individuals is permitted to perform this task?
- A 'competent person' designated by the supervisor for the task.
- The maintenance supervisor, regardless of their specific electrical training.
- Any employee who has completed basic electrical safety awareness training.
- A 'qualified person' with skills and knowledge of the equipment and safety training to recognize and avoid the associated hazards. (Correct answer)
Correct answer: A 'qualified person' with skills and knowledge of the equipment and safety training to recognize and avoid the associated hazards.
OSHA 29 CFR 1910.399 defines a 'qualified person' as one who has received training in and has demonstrated skills and knowledge in the construction and operation of electric equipment and installations and the hazards involved. Only qualified persons are permitted to work on or near exposed energized parts. The other roles do not meet the specific requirements for this high-hazard task.
Question 4: A machine operator needs to clear a minor jam that is a routine part of the production process. The task is repetitive and does not require the operator to place any part of their body into the point of operation where a hazard exists. According to 29 CFR 1910.147, which of the following is true?
- Lockout/Tagout is required regardless of the task's simplicity.
- The task is exempt from LOTO under the 'normal production operations' exception, provided effective alternative protection is used. (Correct answer)
- Only a specially trained 'authorized employee' can clear the jam.
- The machine's emergency stop button must be engaged, which is equivalent to LOTO.
Correct answer: The task is exempt from LOTO under the 'normal production operations' exception, provided effective alternative protection is used.
This scenario fits the exception outlined in 29 CFR 1910.147(a)(2)(ii). Minor servicing activities that are routine, repetitive, and integral to production are not covered by the LOTO standard if alternative measures provide effective protection (e.g., machine guarding under Subpart O).
Question 5: A qualified maintenance technician must measure voltage on energized terminals inside a 480V motor control center. As a supervisor, which administrative control is most critical to verify before this work begins?
- An Energized Electrical Work Permit (EEWP) has been completed and authorized. (Correct answer)
- The technician has a copy of the equipment's one-line electrical diagram.
- A fire watch has been posted at the location of the work.
- The technician's CPR and First Aid certifications are current.
Correct answer: An Energized Electrical Work Permit (EEWP) has been completed and authorized.
NFPA 70E, a standard often referenced by OSHA for electrical safety, requires a documented Energized Electrical Work Permit (EEWP) before work is performed on or near energized parts, unless the work meets specific exemptions like testing. The permit process ensures that justification for energized work is established, hazards are analyzed, and proper protective measures are in place. It is the most critical administrative control for such a high-risk task.
Question 6: On a new construction site, a supervisor observes a worker about to plug a portable power saw into an extension cord connected to a temporary power pole. To comply with OSHA 1926.404(b)(1), what is required for this 120-volt, 15-ampere receptacle outlet?
- A surge protector must be used at the point of connection.
- The saw must be a newer, double-insulated model.
- The outlet must be protected by a Ground-Fault Circuit-Interrupter (GFCI). (Correct answer)
- The generator powering the pole must have an audible low-fuel alarm.
Correct answer: The outlet must be protected by a Ground-Fault Circuit-Interrupter (GFCI).
OSHA standard 1926.404(b)(1)(ii) explicitly requires that all 120-volt, single-phase, 15- and 20-ampere receptacle outlets on construction sites, which are not part of the permanent wiring, must have approved ground-fault circuit-interrupters for personnel protection. The only alternative is an Assured Equipment Grounding Conductor Program.
CSS - Certified Safety Supervisor Electrical Safety and LOTO Questions and Answers 1
A supervisor is assigning roles for a major repair on a conveyor system.
One employee will be performing the actual maintenance requiring lockout, and several others work on the production line that the conveyor feeds.
In the context of Lockout/Tagout (LOTO), how are these employees classified according to OSHA 29 CFR 1910.147?