Class 1 Hazardous Locations refer to facilities which deal with flammable gases, vapors, and liquids. Division 2 specifies that these flammable materials are handled, processed, or used in the defined hazardous location, but are not normally present in concentrations high enough to be ignitable.
What is a Division 2 hazardous area?
2 – Ignitable concentrations of flammable gases or vapors which are not likely to occur under normal operating conditions and if they do will only persist for a short period of time; or volatile flammable liquids, gases, or vapors are confined within closed containers/systems and can escape only as a result of an …
How do you classify hazardous locations?
Hazardous locations are categorized by class, group, and division as follows. Class I: Denotes areas where flammable gas, vapor, or liquid is present. Class II: Denotes areas where combustible dust is present. Class III: Denotes areas where ignitable fibers are present.
What is Class I Div II?
Class I, Division 2 or Zone 2 classified locations. An area where ignitable concentrations of flammable gases, vapors or liquids are not likely to exist under normal operating conditions. In this area the gas, vapor or liquids would only be present under abnormal conditions (most often leaks under abnormal conditions).
What is a Class 1 location?
Class I Locations A “Class I Location” is created by the presence of flammable gases or vapors in the air in sufficient quantities to be explosive or ignitable. When these materials are found in the atmosphere, a potential for explosion exists if an electrical or other source of ignition is present.
What makes something intrinsically safe?
Intrinsically safe equipment is defined as “equipment and wiring which is incapable of releasing sufficient electrical or thermal energy under normal or abnormal conditions to cause ignition of a specific hazardous atmospheric mixture in its most easily ignited concentration.” This is achieved by limiting the amount of …
Is a Class 1 Div 2 motor explosion-proof?
While Division 1 motors in Class I locations must be explosion-proof, Class II, Division 1 motors must be dust- ignition-proof. One important distinction is that the enclosure of a dust-ignition- proof motor is designed to exclude hazardous materials.
What is the difference between NEMA 7 and NEMA 9?
Type 7 NEMA enclosures are built for hazardous locations, so the enclosure is explosion-proof and made for indoor use. Type 9 NEMA enclosures are dust ignition proof and intended for indoor use in hazardous locations.
What is a Class 2 location?
Class II Locations The second type of hazardous location is called a “Class II Location”. This classification is created by the presence of combustible dust in the air in sufficient quantities to be explosive or ignitable.
What is a Class 1 Division 1 hazardous location?
Class I locations are those in which flammable vapors and gases may be present. Class II locations are those in which combustible dust may be found. Class III locations are those which are hazardous because of the presence of easily ignitable fibers or flyings.
What is a Class 1 Division 2 location?
Division 2 is also a subset of Class I and is classified as an area where the explosive or flammable gases, vapors or liquids mentioned above are not likely to exist during regular operation.
Hazardous locations are classified in three ways by the National Electrical Code: TYPE, CONDITION, and NATURE. All of these are Class I gas or vapor hazardous locations. All require special Class I hazardous location equipment.
Can NEMA 4X be used in Class 1 Div 2?
NEMA 4X: Provides the same protection as NEMA 4 with the inclusion of corrosion protection. ** NEMA 8: For either indoor or outdoor use in Class I, Division 2, Groups A, B, C or D hazardous locations according to NFPA 70, this is also referred to as oil immersed.
How do you classify a hazardous area?
How are hazardous locations classified?
What does Division mean in hazardous material category?
Class defines the type of explosive or ignitable substances which are present in the atmosphere. Division defines the likelihood of the hazardous material being present in an explosive or ignitable concentration.
What are the different classes of hazardous materials?
This hazard class is comprised of two divisions of hazardous materials: 5.1 Oxidizer (e.g. hydrogen peroxide and calcium chlorate) 5.2 Organic Peroxide (e.g. Ammonium nitrate fertilizers and hardeners or accelerators) Hazard Class 6 – Poisonous/Toxic and Infectious Substance
What makes a Class 1 Dangerous Goods Dangerous?
Class 1 dangerous goods are explosive substances and articles. There are 6 sub-divisions: Division 1.3: Substances and articles which have a fire hazard and either a minor blast hazard or a minor projection hazard or both
What are the hazards in Hazard Class 2?
Hazard Class 2 – Gases This hazard class is further broken down into three divisions: 2.1 Flammable gas (e.g. spray paint and lighters) 2.2 Non-flammable compressed gas (e.g. oxygen generators and shock absorbers)
