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How can a Nema 1 or 3R Safety Switch be mounted?

NEMA 1 :    NEMA 1 type safety switch (DG; DH; DT) can be mounted in any manner (including horizontal except upside down  (hanging from the ceiling).  The reason:  a switch is not supposed to be
                    mounted upside down as gravity will not allow the arc to extinguish on the bottom half of the switch blades where there are no arc chutes or arc splitters

 

Nema 3R:  NEMA 3R switches are restricted to the vertical (normal - upright) position only.  NEMA 3R enclosures mounted outside (exposed to dripping or splashing water) in a non-vertical position would 
                   not be recommended.