An attendant must be present whenever a worker enters a confined space. The attendant is not allowed to enter the confined space, at anytime.

The attendant must:
 remain alert outside and near to the entrance,
 be in constant communication (visual or speech) with all workers in the confined space,
 monitor the safety of workers inside the confined space
 provide assistance as necessary,
 be provided with a device for summoning help In case of emergency,
and
 initiate an adequate rescue procedure in case of an emergency.

The attendant is not allowed to enter the confined space to perform a rescue even after help has arrived unless he or she is trained and equipped to perform rescue and is replaced by another attendant in accordance with the plan.