jlh,
Not sure if either of these are any use to you, but:
http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=240 09
http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=9805

[This message has been edited by Trumpy (edited 09-10-2003).]