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 Legally certified explosion proof vacuums have been tested and certified to meet standards of safety in explosive situations. Ruwac explosion proof vacuums have been certified by ETL to UL and CSA standards and are safe for use in Class I, Div 1 and 2, Group D and Class II, Div 1 and 2, Group F & G.
There are no UL or CSA regulations that certify an air powered vacuum. So, while not “certified,” Ruwac pneumatically powered vacuums are considered “intrinsically safe.”
A device termed intrinsically safe is “designed to not contain any components that produce sparks or which can hold enough energy to produce a spark of sufficient energy to cause an ignition.” Ruwac pneumatic explosion proof vacuums meet the same standards as our electric vacuums but utilize a solid stainless steel venturi in place of the electric motor and switch. There are no moving parts. They are the safest air powered vacuums on the market. These vacuums, thus, meet safety standards and are safe to use in Class I, Div 1 and 2, Group D and Class II, Div 1 and 2, Group F & G.
What is ETL?
 ETL Testing Laboratories has been conducting electrical performance and reliability tests since 1896. The ETL Listed Mark is accepted throughout the t;st1:placename>United State when denoting compliance with nationally recognized standards such as ANSI, NEC, UL, and CSA.
This certification mark indicates that the product has been tested to and has met the minimum requirements of a widely recognized (consensus) U.S. product safety standard, that the manufacturing site has been audited, and that the applicant has agreed to a program of periodic factory follow-up inspections to verify continued conformance.
What are the groups and classes?
The National Electrical Code (NEC) defines hazardous locations as those areas "where fire or explosion hazards may exist due to flammable gases or vapors, flammable liquids, combustible dust, or ignitable fibers or flyings." A substantial part of the NEC is devoted to the discussion of hazardous locations. That's because electrical equipment can become a source of ignition in these volatile areas.
There are two “Hazardous Locations” Classes as defined by NEC that Ruwac explosion proof vacuums are certified for use. These locations are situations with gases, vapors, liquids and dusts. A list of such follows the chart showing the Hazardous Location Classes.
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Summary of Class I, II Hazardous Locations
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CLASSES
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GROUPS
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DIVISIONS
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1
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2
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I Gases, vapors, and liquids
(Art. 501)
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D: Hydrocarbons, fuels, solvents, etc.
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Normally explosive and hazardous
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Not normally present in an explosive concentration (but may accidentally exist)
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II Dusts
(Art. 502)
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F: Carbon dusts (some are conductive,* and all are explosive)
G: Flour, starch, grain, combustible plastic or chemical dust (explosive)
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Ignitable quantities of dust normally are or may be in suspension, or conductive dust may be present
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Dust not normally suspended in an ignitable concentration (but may accidentally exist). Dust layers are present.
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Items that fit into Group D, F & G
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Group D
Acetic acid (glacial)
acetone
acetonitrile
acrylonitrile
Ammonia (2)
n-amyl acetate
sec-amyl acetate
butylamine
chlorobenzene
cyclohexahe
cyclohexene
cyclopropane
1, 1-dichloroethane
1, 2-dicloroethylene
1, 3-dicloropropene
di-isobutylene
ethane
ethanol (ethyl alcohol)
ethyl acetate
ethyl benzene
ethyl chloride
gasoline
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heptane
heptene
hexane
hexenes
isoamyl acetate
isoprene
isopropyl ether
LPG (liquefied pet gas)
methane (natural gas)
methanol (methyl alcohol)
methyl acrylate
methyl amine
methyl cyclohexane
methyl ethyl ketone
methyl isobutyl ketone
methyl isocyanate
2-methyl-1 propanal (isobutyl alcohol)
naphtha (petroleum)
nonane
nonene
octane
octene
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pentane
1-pentanol (amyl alcohol)
2- pentanone
1- pentene
propane
1- propanol (propyl alcohol)
2- propanol (isopropyl alcohol)
propylene
styrene
toluene
turpentine
vinyl chloride
xylenes
Group F & G
Carbon black
coal
charcoal
coke dust
flour
starch
grain dust
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Ruwac explosion proof vacuums also carry these marks
 The Ex mark is a specific marking for explosive protection equipment. It is used to show that equipment, protective systems or components comply with the requirements of the European standards that are harmonized with the 94/9/EC Directive (ATEX Directive, named after the French "ATmosphere EXplosible").
 The CE marking (an acronym for the French "Conformite Europeenne") certifies that a product has met EU health, safety, and environmental requirements, which ensure consumer safety.
Ruwac is ISO 9001 certified
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Why Ruwac Vacuums 