When posting of signs is infeasible (e.g. sewer manhole covers or aircraft panels) and where personell cannot inadvertently enter, such as those protected by locks or those that require tools to open.
No.
if the commander or functional manager determines that workers or other employees will not enter permit-required confined spaces under their control, and they have been prohibited from entering
assistance in evaluating confined spaces
Confined spaces are classified as either non-permit required or permit-required. Non-permit required spaces are considered safe for entry without specific precautions, while permit-required spaces have the potential for hazards like toxic atmospheres or limited entry/exit points that require special training and permits for entry.
confined space entry permit
The confined space attendant.
Improve the ventilation rate
prior to entering a permit-required confined space entry. Emergency rescue assistance must be coordinated and it must be ensured that the fire department is available, if required, to respond for the duration of the entry.
A confined space is designated as a permit-required confined space if it contains or has the potential to contain hazardous atmospheres, such as toxic gases or insufficient oxygen. Additionally, it may have a configuration that could impede entry or exit, and it may pose other safety risks, such as engulfment or entrapment. These characteristics necessitate a formal permit system to ensure safety measures are in place before entry.
maintain continuous communication with all authorized entrants within the permit-required space, by voice, radio, telephone, visual observation or other equally effective means
No it is not required ..
If oxygen levels fall below 19.5% during a permit-required confined space entry, all entrants must stop work immediately and leave the confined space. No one may reenter that space until testing shows that adequate oxygen levels have been restored.