A 240-volt electrical panel needs maintenance during construction. The electrician estimates 45 minutes to complete the work. What is the minimum voltage level that requires lockout/tagout procedures?
Correct Answer
B) 50 volts
OSHA requires lockout/tagout procedures for electrical circuits of 50 volts or more. Since this 240-volt panel exceeds 50 volts, proper lockout/tagout procedures must be followed to ensure worker safety during maintenance.
Why This Is the Correct Answer
OSHA Standard 29 CFR 1910.147 requires lockout/tagout (LOTO) procedures for electrical circuits operating at 50 volts or higher. This threshold applies to all electrical work where employees could be exposed to energized parts. Since the 240-volt panel in the question exceeds this 50-volt minimum, proper LOTO procedures must be implemented before any maintenance work begins to protect workers from electrical hazards.
Why the Other Options Are Wrong
Option C: 480 volts
120 volts is incorrect because it sets the threshold too high. OSHA requires lockout/tagout procedures at 50 volts, not 120 volts. This would leave workers unprotected when working on circuits between 50-119 volts, which still pose significant electrical hazards and require proper safety procedures.
Option D: 240 volts
480 volts is incorrect as it represents a much higher voltage threshold than required by OSHA. This would leave workers unprotected when working on lower voltage systems that still pose serious electrical hazards. The actual OSHA requirement begins at 50 volts, making this answer far too high.
Memory Technique
Remember 'FIFTY and SAFE' - OSHA requires lockout/tagout procedures starting at 50 volts to keep workers safe from electrical hazards.
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