Licensed Electrical Contractor OSHA Safety Standards 3 — Questions and Answers
Question 1: According to OSHA 1926.502, when must a personal fall arrest system (PFAS) be inspected?
- Monthly by a supervisor
- Before each use by the user (Correct answer)
- Annually by a certified inspector
- After every 10 uses
Correct answer: Before each use by the user
OSHA 1926.502 requires that personal fall arrest systems be inspected before each use for damage, wear, and proper function.
Question 2: Under OSHA 1910.303(b)(1), the minimum working clearance in front of electrical equipment rated 0–150V to ground operating at 0–150V nominal is:
- 18 inches
- 3 feet (Correct answer)
- 4 feet
- 6 feet
Correct answer: 3 feet
OSHA Table S-1 (1910.303) specifies a minimum 3-foot working clearance for equipment in the 0–150V to ground / 0–150V nominal voltage range.
Question 3: OSHA's Hazard Communication Standard (29 CFR 1910.1200) requires that Safety Data Sheets (SDS) be available to employees:
- Only during annual safety training
- At all times during each work shift (Correct answer)
- Only when a chemical spill occurs
- Upon written employee request within 15 days
Correct answer: At all times during each work shift
OSHA 1910.1200 requires that SDS be readily accessible to employees at all times during each work shift when they are in their work area.
Question 4: A qualified electrical worker finds a conductor presumed de-energized. OSHA 1910.333 requires the worker to treat the conductor as energized until:
- A supervisor verbally confirms it is off
- It has been tested and verified de-energized with a proper testing device (Correct answer)
- A lockout tag is visible on the panel
- The circuit has been de-energized for at least 10 minutes
Correct answer: It has been tested and verified de-energized with a proper testing device
OSHA requires conductors to be tested and verified de-energized with an appropriate voltage-testing device before being treated as safe to touch.
Question 5: Which OSHA regulation establishes the requirement for Ground-Fault Circuit Interrupter (GFCI) protection on construction sites for all 120-volt, single-phase, 15- and 20-ampere receptacle outlets?
- 29 CFR 1910.304
- 29 CFR 1926.404(b)(1) (Correct answer)
- 29 CFR 1926.501
- 29 CFR 1910.147
Correct answer: 29 CFR 1926.404(b)(1)
29 CFR 1926.404(b)(1) specifically mandates GFCI protection for 120V, single-phase, 15 and 20A receptacles used by employees on construction sites.
Question 6: Under OSHA 1926.950, an electrical contractor's safety program must include written procedures for:
- Marketing and customer outreach
- Determining the voltage of exposed energized parts (Correct answer)
- Hiring qualified electricians
- Scheduling permit inspections
Correct answer: Determining the voltage of exposed energized parts
OSHA 1926.950 requires employers to have written procedures for determining the voltage of exposed parts before work begins.
Question 7: OSHA requires that portable ladders used to access an upper landing surface extend at least how far above that surface?
- 1 foot
- 2 feet
- 3 feet (Correct answer)
- 4 feet
Correct answer: 3 feet
OSHA 1926.1053 requires portable ladders to extend at least 3 feet above the upper landing surface to provide a safe handhold.
Licensed Electrical Contractor OSHA Safety Standards 3
According to OSHA 1926.502, when must a personal fall arrest system (PFAS) be inspected?