What is required before a worker enters a permit-required confined space, such as a tank being coated?

Giải thích

Permit-required confined spaces can contain toxic or oxygen-deficient atmospheres, especially when solvent coatings are applied, so Cal/OSHA requires air monitoring, ventilation, a written permit, and an attendant outside. Entry without these controls has caused fatalities. A rescue plan must also be in place before entry.