Explosion Proof Control Panels
Hydro-Flo has built "Explosion Proof Panels"
for hazardous locations worldwide. All our panels are built to
National Electrical Code (NEC) specifications and are suitable for
installation in in Class I, II or III Hazardous Locations.
Depending on your site specific requirements we can supply a NEMA 7 explosion proof enclosure or a
purged NEMA 4 enclosure.
While both types of panels are suitable for
hazardous locations, there are a few basic differences between a
NEMA 7 and a purged NEMA 4
-
Nema 7 panels attempt to contain any
possible explosion. NEMA 7 enclosures are cast from heavy
duty aluminum so that they cannot create a spark that could
possible ignite the vapors in a hazardous location. These
heavy duty panels come with "O" ring gaskets to keep explosive
fumes from entering the panel and are designed to contain an
internal explosion without igniting the explosive vapors present
in the hazardous area.
-
Purged NEMA 4 panels attempt to keep any
explosive fumes from entering the panel. From the exterior
they look just like a typical control panel. The
difference is that the interior of the enclosure is constantly
being purged with either nitrogen or air. This process
keeps the panel free of any explosive vapors that may be present
in the hazardous area. These purged systems are often
required to come equipped with pressure sensors, alarms and
automatic shut down functions in the event of the purge system
failure.
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