17.62 Design Case Study. An architectural design and engineering firm seeks advice regarding federal safety standards for wiring for a new process being set up to manufacture dyestuff. The process uses chlorobenzene and releases ignitable concentrations in the vicinity of the process equipment. Specify the appropriate Class, Division, and Group classification for wiring and electrical equipment located in this area.

17.63 Design Case Study. In the case study of Exercise 17.62, suppose an alternate supplier of process equipment proposes a completely closed system in which releases would only occur during repair or in event of a leak. Such occurrences arise frequently out of a need to regularly clean the in-feed mechanism. Would the closed system have an impact on safety and on the prescribed wiring system?