Ceiling Limit 2 : Medicine. In threshold limit value (TLV) and permissable exposure limit (PEL), the maximum allowable concentration to which an employee may be exposed
Grainger, Inc. (Maintenance, Repair and Operating MRO), Glossary of Safety Terms, IL, USA 2012. www.grainger.com/images/GlossaryofSafetyTermsPDF.p df, (IndS/Maint, Repr and Opr - Amer) {79}