A worker must enter a below-grade electrical vault to perform maintenance. The space measures 6' x 8' x 7' high with a 24-inch square access opening. What type of space classification applies?
Correct Answer
B) Permit-required confined space
This meets the definition of a permit-required confined space: large enough for entry, limited means of entry/exit (24-inch opening), not designed for continuous occupancy, and contains potential electrical hazards.
Why This Is the Correct Answer
This electrical vault meets all criteria for a permit-required confined space under OSHA 1910.146. It's large enough for bodily entry (6'x8'x7'), has limited entry/exit means (24-inch square opening), is not designed for continuous occupancy, and contains recognized serious safety hazards including electrical equipment that could cause electrocution, arc flash, or create oxygen-deficient atmospheres requiring atmospheric testing and safety procedures.
Why the Other Options Are Wrong
Option A: Restricted access space
Restricted access space is not a standard OSHA classification. While the 24-inch opening does restrict access, this doesn't override the more specific permit-required confined space classification that applies when serious hazards are present.
Option C: Standard workspace
Standard workspace classification ignores the confined space hazards present. The limited entry/exit through a 24-inch opening and electrical hazards make this far more dangerous than a standard work environment requiring special safety protocols.
Option D: Non-permit confined space
Non-permit confined spaces lack serious hazards. This electrical vault contains significant electrical hazards including potential for electrocution, arc flash, and atmospheric hazards, requiring the full permit-required confined space entry procedures under OSHA standards.
Memory Technique
Remember 'HELP' for Permit-Required: Hazards present, Entry possible, Limited access, Permit needed. Electrical vaults always have hazards.
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