Enclosure class

Safety equipment and interface Fire/explosion with detection and protection, chemical reactivity, mitigation system, enclosure class, intrinsic safety circuits, etc. 

A few relevant standards Combustible gas detection Explosion protection Enclosure class Intrinsically safe circuits... 

The details discussed here shall be read in conjunction with Chapter X. In fact, engineering details for electrical enclosure class and area classification has been discussed in details in Chapter X. Here, supplementary information has been included to complete the discussion on the subject. Explosion proof and flame proof enclosures are the two most commonly used hazardous area protection techniques. 

Various enclosure classes normally used in various applications have been discussed in Clause 3.6 of Chapter X. Here, the supplementary information related to that will be covered. 

It is not unlikely that there may be some confusion in the reader s mind, after going through so many ways of area classifications, again, each class further divided according to material types. Also, these are not uniform across standards. For example, in ATEX for dust in mines, and other than mines, have different representations and ignitable fibers mentioned in the United States standard is not separately treated in other standard. In order to circumvent the situation, a small comparative study has been presented after, so the reader can understand the same properly. In order to supplement Table X/3.2.3-3, at this point some detailed comparisons of various standards have been presented in Table APII/2.2-1 and Fig. APII/2.2-1 (mainly for enclosure class) to get a better grasp on the issue about applicability (as per location/ country). 

In the initial pilot-plant experiments, an immersion probe was used as the interface to the sampling stream [32]. The analyzer itself was a dispersive CCD-Raman spectrometer using a 532-nm diode laser as the excitation source fitted in nitrogen-purged National Electrical Manufacuters Associate (NEMA)-rated enclosure (Class 1, Div. II [33]. In Figs. 15 and 16, characteristic spectra of several of the individual components in the process steam are shown. 

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