DR DE Modification of Clause 1 to replace with the following: This document specifies the general requirements for construction@ testing and marking of Ex Equipment and Ex Components intended for use in explosive atmospheres. Explosive atmospheres are identified by the National Electrical Code?@ ANSI/NFPA 70 as hazardous (classified) locations and include the following specified locations: ? Class I@ Zone 0 ? Class I@ Zone 1 ? Class I@ Zone 2 ? Zone 20 ? Zone 21 ? Zone 22