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 I Division II Location example?
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 are the 3 classes of hazardous locations?
Let’s quickly review. The National Electric Code classifies hazardous locations in three ways: TYPE, CONDITION, and NATURE. There are three types of hazardous conditions: Class I – gas and vapor, Class II dust, and Class III – fibers and flyings.
What is a Class I 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.Does Class 1 Div 2 require explosion proof?
A Class I Division 2 light are not held to as high of a standard as Division 1 products. To meet the requirements for Division 2, a light does not have to be able to contain an explosion. Instead, they must be found to be unable to cause an explosion in environments for which they are approved to be used.
What is Class I Div II?
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.
Is NEMA 4X good for Class 1 Div 2?
We recommend electrical enclosures meet or exceed a NEMA rating of Type 4 or Type 4X for use in a Class1 Div2 hazardous location when used with appropriate purge systems.
What is a Class 2 Div 2 area?
Class II locations consist of locations where combustible dusts may exist that have the potential to become flammable or ignitable. … Division 2 is also a subset of Class II and is classified as an area where the explosive or flammable combustible dusts mentioned above are not likely to exist during regular operation.What is a Class 1 Division 2 motor?
Class I, Division 2. This classification usually includes locations where volatile flammable liquids or flammable gases or vapors are used, but which, in the judgment of the authority having jurisdiction, would become hazardous only in case of an accident or of some unusual operating condition.
What is Gas Group IIC?– Group IIA—Atmospheres containing propane, or gases and vapors of equivalent hazard. … – Group IIC—Atmospheres containing acetylene or hydrogen, or gases and vapors of equivalent hazard. n Group III—Equipment intended for use in places. with an explosive dust atmosphere.
Article first time published onWhich of the following is listed as a Class 2 hazardous material?
Commonly transported class 2 dangerous goods include oxygen, natural gas, carbon dioxide, lighters, and aerosols.
What is class and division?
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.
Which of the following wiring methods is permitted to be used in Class II Division 1 locations?
In Class II, Division 1 locations, the following wiring methods shall be permitted: Threaded rigid metal conduit (Type RMC) or threaded steel intermediate metal conduit (Type IMC). Type MI cable with termination fittings listed for the location.
What is a Class 1 Division 2 hazardous area?
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 makes a light explosion proof?
To be certified, explosion-proof lights typically will be made of durable, non-sparking material, a very thick glass globe over the bulb, and other features to ensure that the worker and the surrounding environment remains safe should an ignition occur inside the light.
What is a Class 2 motor?
Class II Group F & G locations are atmospheres containing dust such as (F) Carbon Black, coal or Coke Dust, (G) Flour, Starch or Grain Dusts. 2. As required by Underwriters Laboratories and Canadian Standards Association, explosion-proof motors with Class II Group F & G approvals must have over temperature protection.
Is NEMA 12 explosion proof?
A NEMA 12 enclosure is not explosion-proof. … These enclosure types are designed to offer protection in indoor environments with explosion hazards from flammable gases or vapors.
What NEMA 7 enclosure?
NEMA 7 enclosures are designed to contain an internal explosion without causing an external hazard. These enclosures are intended for indoor use in hazardous locations classified as Class I, Division I, Groups A,B,C, or D.
What is the difference between NEMA 4 and 4X?
The Difference between NEMA 4 and NEMA 4X Enclosures is that NEMA 4X Enclosures offer corrosion resistance. … X (as 4X) indicates additional corrosion resistance.
What is the difference between Zone 1 and Zone 2?
Zone 1: An area in which an explosive gas atmosphere is likely to occur in normal operation; Zone 2: An area in which an explosive gas atmosphere is not likely to occur in normal operation and, if it occurs, will only exist for a short time.
Is 5572 a standard?
IS 5572: Classification of hazardous areas (other than mines) having flammable gases and vapours for electrical installation.
What is an ATEX certificate?
If a product / piece of equipment has official ATEX certification, it has been fully tested and approved to be safe to use in hazardous / explosive atmospheres.
How do I know if my motor is Class 1 Div 1?
They must be built and labeled as explosion-proof. Class I, Division 1 motors must possess specific characteristics to be classified as explosion-proof. First, the motor must be designed to contain any internal explosions without rupturing completely.
Are Tefc motors rated for Class 1 Div 2?
Class I, Division 2 Motors TEFC (Totally Enclosed, Fan Cooled) motors and ODP (Open Drip -proof) motors can be used in Division 2 locations provided they do not have ignition sources such as arc-producing brushes or switching mechanisms.
What are the classification of motor?
It is classified into three types; they are the induction motor, synchronous motor, the linear motor. The detail explanation of the motor is expressed below.
What is a Class 2 Division 1 malocclusion?
▪ Class II Division 1 is when the maxillary. anterior teeth are proclined and a large overjet is present. ▪ Class II Division 2 is where the maxillary. anterior teeth are retroclined and a deep overbite exists. Class II Malocclusion.
What are fibers and Flyings?
Easily ignitable fibers or flyings present a fire but not an explosion hazard. An example of this type of material is the cotton lint that accumulates in the lint trap of clothes dryers. Listed clothes dryers are designed so that even if the lint ignites, the fire will be contained within the dryer enclosure.
Is Diesel considered a hazardous location?
How does the Code address diesel fuel dispensers as they relate to hazardous locations? A. The hazardous Class I location requirements contained in Art. … The flash point of diesel fuel is 100°F or above; thus, the area involving diesel fuel is typically not a classified location.
Which is an example of group I gas?
GAS GROUPSTYPICAL GAS EXAMPLEIFiredamp (Methane) and coal dustIIAPetrol, Propane, Industrial MethaneIIBCoke Oven Gasses, EthyleneIICAcetylene, Carbon Disulphide, Hydrogen
What is ATEX Group II?
ATEX equipment group II: Equipment in this category is intended for use in areas in which explosive atmospheres caused by gases, vapours, mists or air/dust mixtures are likely to occur occasionally.
What is gas classification?
Hazard classification Compressed gases are classified as class I, II, III, or IV in order of decreasing hazard. * Classes are based on the lethal concentration to 50% of test animals (rats) of each gas (LC50).
