The OSHA 30 hour course does cover confided space entry. However, I believe the "permit" is issued by the employer to certain authorized employees.
Henry Wilter | http://www.easysafetyschool.com/http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=standards&p_id=9797
This could cause more trouble then it would prevent. If all of the workers were blasting music in their ears they wouldn't be able to hear each other and would probably not pay full attention to workplace hazards.
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