Which safety practice is specified for mechanical room entry in B28 facilities?

• A. Entry is open to any staff at any time
• B. Entry requires no training
• C. Entry is controlled by random checks
• D. Access is restricted to trained personnel; use signage, door interlocks, and LOTO when necessary

Answer: (D)

Access to a B28 mechanical room is restricted to those who are trained and authorized, with safety controls in place to prevent unintended entry or energy exposure. This is essential because mechanical rooms with flammable refrigerants pose ignition and energy hazards, so only personnel who understand the risks should enter. Signage alerts workers to the hazards and who is authorized, door interlocks help prevent unauthorized or accidental entry, and Lockout/Tagout procedures are used when maintenance requires isolating equipment to ensure it cannot be energized or started unexpectedly. Without restricted access, untrained staff could mismanage hazards; without proper signage, people might not recognize the danger; without interlocks and LOTO, equipment could be energized or hazards could be released during maintenance.