Cut Sheet

Volume 8—Sensing Solutions CA08100010E—November 2012 www.eaton.com V8-T12-39
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12.1
Sensor Learning Course
Learning Module 23: Limit Switches, Proximity Sensors and Photoelectric Sensors
Enclosure Ratings
NEMA Non-Hazardous Locations
NEMA Hazardous Locations
Type Description
1 For indoor use, primarily to provide a degree of protection against contact with the enclosed equipment.
3 Intended for outdoor use, primarily for a degree of protection against windblown dust, rain, sleet and external ice formation.
3R For outdoor use, primarily to provide a degree of protection against falling rain, sleet and external ice formation.
4 For indoor and outdoor use, primarily to provide a degree of protection against wind blown dust and rain,
splashing water and hose directed water.
4X Intended for indoor or outdoor use, primarily to provide a degree of protection against corrosion,
windblown dust and rain, splashing water and hose directed water.
6 Intended for indoor or outdoor use, primarily to provide a degree of protection against the entry of
water during occasional temporary submersion at a limited depth.
6P Intended for indoor or outdoor use, primarily to provide a degree of protection against the entry of
water during prolonged submersion at a limited depth.
12 Intended for indoor use, primarily to provide a degree of protection against dust, falling dirt and dripping non-corrosive liquids.
13 Intended for indoor use, primarily to provide a degree of protection against dust, spraying of water, oil and non-corrosive coolant.
Type Description
Type 7 For indoor use, within conditions of Class I and Groups shown, to withstand and contain an internal explosion of specified
gases, or to contain an explosion sufficiently so as not to ignite an explosive gas-air mixture in the surrounding atmosphere.
Class I
Group A Acetylene
Group B Hydrogen, butadiene, ethylene oxide, propylene oxide
Group C Carbon monoxide, ether, ethylene, hydrogen sulfide, morpholine, cyclopropane
Group D Gasoline, benzene, butane, propane, alcohol, acetone, ammonia, vinyl chloride
Type 9 For indoor use, within Class II and Groups shown below conditions, to withstand and contain an internal explosion of specified
dusts, or to contain an explosion sufficiently so as not to ignite an explosive dust-air mixture in the surrounding atmosphere.
Class II
Group E Metal dusts
Group F Carbon black, coke dust, coal
Group G Grain dust, flour, starch, sugar, plastics