Chapter - 3
MNL000442.doc
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09/19/2016
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In NEC Class I, Division 2 applications (in U.S.A.) and in ATEX Zone (Group) 2,
Category 3 (in Europe) this supply is also used for Type Z purge of the electrical
enclosure. The Type Z purge is required to maintain a positive pressure at or above
0.1" H
2
O (24.9 Pa) as dictated by the National Fire Protection Agency (NFPA) and the
European directives (ATEX). In applications where Type Z purge is required, the
controller will be equipped with a pressure switch to monitor the pressure. The Type
Z purge will require a flow rate of approximately 2.5-2.8 LPM (5-6 CFH).