This can be done by posting danger signs such as
“DANGER—PERMIT-REQUIRED CONFINED SPACE—AUTHORIZED
ENTRANTS ONLY” or using an equally effective means.
If employees are not to enter and work in permit spaces,
employers must take effective measures to prevent them from
entering these spaces. If employees are expected to enter permit
spaces, the employer must develop a written permit space program
and make it available to employees or their representatives.