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 Vacuum Stations and
Vacuum Pumps
Explosion
Proof Motors
for Harsh Environments
Explosion
Proof
Definitions and Requirements
(Taken from National Electrical Code® - 1999 Edition)
Class, Division, Group |
Description |
Example |
Class 1, Division 1,
Group D |
Environment
containing flammable gas, flammable liquid-produced vapor, or combustible
liquid-produced vapor mixed with air that may burn or explode, having
either a maximum experimental safe gap (MESG) value greater than 0.75 mm
or a minimum igniting current ratio (MIC ratio) greater than 0.80. |
Propane |
Class
1, Division 1,
Groups C & D |
Environment
containing flammable gas, flammable liquid-produced vapor, or combustible
liquid-produced vapor mixed with air that may burn or explode, having
either a maximum experimental safe gap (MESG) value greater than 0.45 mm
and less than or equal to 0.75 mm or a minimum igniting current ratio (MIC
ratio) greater than 0.40 and less than or equal to 0.80. |
Ethylene |
| AND
Environment containing flammable gas, flammable liquid-produced vapor, or
combustible liquid-produced vapor mixed with air that may burn or explode,
having either a maximum experimental safe gap (MESG) value greater than
0.75 mm or a minimum igniting current ratio (MIC ratio) greater than 0.80. |
Propane |
Class 2, Division 1,
Groups F & G |
Environment containing combustible
carbonaceous dusts that have more than 8 percent total entrapped volatiles or that have
been sensitized by other materials so that they present an explosion hazard. AND Environment containing combustible dusts not included
in Groups E & F, including flour, grain, wood, plastic, and chemicals. |
Coal, Carbon
black, charcoal, and coke dusts |
Note:
In accordance with the NEC®, Explosion Proof units are only suitable for the groups
for which they are specified. Because of the way Regenerative Vacuum Pumps
operate, ANVER does not offer units that are approved for Group A, B, or E
environments. Regenerative Pumps should not be used in these
locations. Consult ANVER for details.
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