A permit-required confined space is a confined space with potential hazards that require a permit; which of the following controls are typically required before entry?

• A. Only posting a sign and training workers.
• B. Atmospheric testing, ventilation, continuous monitoring, and an attendant/rescue plan.
• C. No pre-entry controls are required.
• D. Emergency procedures after entry only.

Answer: (B)

A permit-required confined space requires concrete measures to prevent harm before anyone enters. The essential pre-entry controls are atmospheric testing to verify safe oxygen levels and absence (or acceptable levels) of harmful gases, ventilation to dilute or remove hazards, continuous monitoring to catch any changes during the job, and an attendant plus a rescue plan to ensure quick help if something goes wrong. These elements work together to confirm a safe initial condition, maintain it throughout the entry, and provide a means to respond if conditions deteriorate.

Posting a sign and training workers, while important, doesn’t by itself ensure a safe entry condition. No pre-entry controls leaves hidden hazards unaddressed, and relying only on emergency procedures after entry fails to prevent harm.