| Cover: An unhinged portion of an enclosure that covers an opening.
Degree of Protection: The extent of protection provided by an enclosure against access to hazardous parts, against ingress of foreign solid objects and/or against ingress of water and verified by standardized test methods.
Design Tests: Tests to demonstrate performance of a product designed to applicable standards. (Note: Design tests are not intended to be production tests.) NEMA 250-2003.
Door: A hinged portion of an enclosure that covers an opening. NEMA 250-2003.
Hazardous (Classified) Locations are those areas, which may contain hazardous (classified) materials in sufficient quantity to create an explosion. See Article 500 of the National Electrical Code. NEMA 250-2003.
Hazardous (Classified) Materials are those gases, vapors, combustible dusts, fibers, or flyings, which are explosive under certain conditions. NEMA 250-2003.
Hazardous Parts are parts that are hazardous to approach or touch.
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Indoor Locations are those areas, which are protected from exposure to the weather. NEMA 250-2003.
Knockout is a portion of the wall of an enclosure so fashioned that it may be removed readily by a hammer, screwdriver, and pliers at the time of installation in order to provide a hole for the attachment of an auxiliary device or raceway, cable, or fitting. NEMA 250-2003.
Non-Hazardous Locations: Areas, which do not contain hazardous (classified) materials in sufficient quantity to create an explosion. NEMA 250-2003.
Non-Ventilated means constructed so as to provide no intentional circulation of external air through the enclosure. NEMA 250-2003.
Oil-Resistant Gaskets are those made of material, which is resistant to oil, or oil fumes. NEMA 250-2003.
Outdoor Locations are those areas, which are exposed to the weather. NEMA 250-2003.
Ventilated means constructed so as to provide for the circulation of external air through the enclosure to remove excess heat, fumes, or vapors. NEMA 250-2003.
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