Licensed Electrical Contractor OSHA Safety Standards Questions and Answers 1 — Questions and Answers
Question 1: An electrician is preparing to perform maintenance on a permanently installed industrial machine. After shutting down the equipment using the normal stopping procedure, what is the next critical step required by the OSHA Lockout/Tagout standard (29 CFR 1910.147) before applying a lock?
- Verbally inform all coworkers in the immediate area.
- Locate and operate the energy isolating device(s) to isolate the machine from its energy source. (Correct answer)
- Test the machine's start button to ensure it doesn't operate.
- Immediately attach a personal lock to the main control panel.
Correct answer: Locate and operate the energy isolating device(s) to isolate the machine from its energy source.
According to the sequence in OSHA 29 CFR 1910.147, after the machine is shut down by normal means, the next step is to locate and operate all energy isolating devices (e.g., disconnect switches, circuit breakers) to ensure the equipment is completely isolated from its energy source(s) before a lock can be applied. Verification of de-energization occurs after the lock and tag are applied.
Question 2: On a construction site, an electrical contractor opts to implement an Assured Equipment Grounding Conductor Program (AEGCP) as an alternative to using GFCIs. According to OSHA 29 CFR 1926.404, which of the following is a mandatory component of this program?
- A written description of the program must be kept at the jobsite, and specific equipment tests must be performed at regular intervals. (Correct answer)
- All cord sets and receptacles must be visually inspected weekly by a designated safety officer.
- All employees must receive specialized training on GFCI operation and theory.
- The jobsite superintendent must personally test every tool each morning before use.
Correct answer: A written description of the program must be kept at the jobsite, and specific equipment tests must be performed at regular intervals.
OSHA standard 29 CFR 1926.404(b)(1)(iii) requires that an AEGCP must include a written program description available at the jobsite, the designation of competent persons to implement it, and specific, documented tests (continuity and terminal connection) on equipment at required intervals, such as before first use and every 3 months.
Question 3: According to OSHA 29 CFR 1926.416, work on or near energized electrical circuits is generally prohibited. Energized work is only permitted under specific conditions, such as when:
- the project is behind schedule and de-energizing would cause a significant delay.
- the qualified electrician has over 20 years of experience with similar systems.
- de-energizing the circuit is infeasible or would introduce additional or increased hazards. (Correct answer)
- the work is considered minor, such as replacing a single receptacle or switch.
Correct answer: de-energizing the circuit is infeasible or would introduce additional or increased hazards.
OSHA's standards, including 29 CFR 1926.416, and the widely referenced NFPA 70E, strictly limit work on energized equipment. The primary justification for performing energized work is if the employer can demonstrate that de-energizing is infeasible due to equipment design or operational limitations, or if it creates a greater hazard than working energized (e.g., shutting down life-support systems). Inconvenience or project delays are not acceptable reasons.
Question 4: An electrical contractor is tasked with running conduit on the exterior of a building, and a 25 kV overhead power line is present. According to OSHA's standards for equipment operation near power lines (29 CFR 1926.1408), what is the mandatory minimum approach distance that must be maintained from the line?
- 5 feet
- 20 feet
- 10 feet (Correct answer)
- 15 feet
Correct answer: 10 feet
According to OSHA 29 CFR 1926.1408, Table A, the minimum approach distance for voltages up to 50 kV is 10 feet. This is the absolute minimum clearance that any part of the equipment, load, or personnel may breach unless the power line is de-energized or specific, more stringent precautions are taken.
Question 5: An electrician is using an 8-foot A-frame stepladder to install a smoke detector. According to OSHA safety standards for ladders (29 CFR 1926 Subpart X), which of the following actions is a direct violation?
- Facing the ladder while climbing and descending.
- Placing the ladder on a level, stable concrete floor.
- Standing on the ladder's top step to reach the ceiling. (Correct answer)
- Maintaining three points of contact while climbing.
Correct answer: Standing on the ladder's top step to reach the ceiling.
OSHA standard 29 CFR 1926.1053(b)(13) explicitly states that the top or top step of a stepladder shall not be used as a step. This practice makes the ladder extremely unstable and is a common cause of falls. The other options are all required safe practices for ladder use.
Question 6: An electrical contractor's crew must enter a trench that is 7 feet deep to install underground conduit. Per OSHA standards for excavations (29 CFR 1926 Subpart P), what is the primary requirement that must be met before any worker enters the trench?
- The spoil pile must be placed at least 1 foot from the edge of the trench.
- A means of egress, such as a ladder, must be located within the trench.
- The atmosphere within the trench must be tested for oxygen deficiency.
- A competent person must inspect the trench and the protective systems and deem it safe for entry. (Correct answer)
Correct answer: A competent person must inspect the trench and the protective systems and deem it safe for entry.
OSHA 29 CFR 1926.651(k)(1) mandates that daily inspections of excavations and their protective systems must be made by a competent person before work starts and as needed throughout the shift. No employee is permitted to enter until the competent person has determined it is safe to do so. While other options are also requirements (spoil pile 2 feet away, egress every 25 feet), the competent person's inspection and approval is the overarching prerequisite for entry into any trench deeper than 5 feet.
Licensed Electrical Contractor OSHA Safety Standards Questions and Answers 1
An electrician is preparing to perform maintenance on a permanently installed industrial machine.
After shutting down the equipment using the normal stopping procedure, what is the next critical step required by the OSHA Lockout/Tagout standard (29 CFR 1910.147) before applying a lock?