NFPA 497 updates the electrical classification (HAZLOC) around PRVs

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NFPA 497 PRVs Discharge

NFPA 497 has added TWO (2) NEW figures to establish classification areas around Pressure Relief Valve (PRV) vents.  The classification areas of the sources in several figures in Section 5.11 have been removed to eliminate confusion.  This change is significant in two (2) ways:

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