When implementing lockout/tagout procedures for electrical equipment maintenance, what is the minimum voltage threshold that requires LOTO procedures?
Correct Answer
A) 50 volts
OSHA requires lockout/tagout procedures for electrical circuits of 50 volts or more. This threshold is based on the potential for serious injury or death from electrical shock.
Why This Is the Correct Answer
OSHA Standard 29 CFR 1910.147 specifically establishes 50 volts as the minimum threshold for mandatory lockout/tagout procedures. This voltage level is considered the point where electrical energy poses a significant risk of serious injury or death to workers. The 50-volt threshold balances practical workplace operations with worker safety, as voltages below this level are generally considered safer for routine maintenance work. This standard applies to all electrical equipment and circuits in commercial and industrial settings.
Why the Other Options Are Wrong
Option B: 24 volts
120 volts is well above the actual threshold and would exclude many electrical systems between 50-120 volts that do require LOTO procedures. This higher threshold would leave workers exposed to dangerous voltage levels without proper protection.
Option D: All voltages require LOTO
24 volts is below the OSHA-mandated threshold of 50 volts. While 24-volt systems can still pose some risk, OSHA determined that the risk level doesn't warrant mandatory LOTO procedures, though good safety practices may still recommend precautions.
Memory Technique
Think 'Fifty-Fifty chance of serious injury' - 50 volts is where OSHA draws the line for mandatory LOTO procedures because that's when electrical shock becomes significantly dangerous.
Reference Hint
OSHA 29 CFR 1910.147 - The Control of Hazardous Energy (Lockout/Tagout) standard, specifically section 1910.147(a)(1)(i)
More Project Mgmt Questions
What is the minimum R-value required for wall insulation in Florida Climate Zone 2?
A subcontractor brings a new chemical product to your jobsite. Under the Globally Harmonized System (GHS), what information must be immediately available to workers?
A construction site has a trench that is 8 feet deep in Type B soil. What is the maximum allowable slope ratio for the trench walls without protective systems?
What is the maximum recommended spacing between drywall screws when attaching to wood studs?
Your crew discovers suspected asbestos-containing materials during a renovation project. What is the first action you should take?
A scaffold platform is 12 feet long and 5 feet wide. If the maximum load capacity is 25 pounds per square foot, what is the total weight capacity of this platform?
Which CSI MasterFormat Division would contain specifications for fire-stopping and firesafing materials?
In tilt-up concrete construction, what is the primary advantage of this method over conventional cast-in-place construction?
Which OSHA standard specifically addresses construction industry safety and health regulations?
A structural drawing shows a beam labeled 'W12x26'. What does the '26' represent?
People Also Study
Business & Financial Management
120 questions · 70% to pass
Contract Administration
60 questions · 70% to pass