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 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.

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.

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 Division 2?

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 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 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 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 is listed as a Class 2 hazardous material?

Commonly transported class 2 dangerous goods include oxygen, natural gas, carbon dioxide, lighters, and aerosols.

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.

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Is intrinsically safe the same as explosion proof?

WHAT IS INTRINSIC SAFETY AND EXPLOSION PROOF? … Therefore, Intrinsically Safe means that an apparatus, such as a temperature transmitter is not capable of causing an explosion. Explosion Proof means that should an explosion occur, it will be contained within an enclosure.

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 an ATEX zone?

ATEX generally refers to the hazard of explosive atmospheres occurring in the workplace due to the presence of flammable gasses or combustible dust mixed in air, which can give rise to the risk of explosion.

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.

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.

What is the difference between Zone 0 1 and 2?

Zone 0: Explosive atmosphere for more than 1000h/yr. Zone 1: Explosive atmosphere for more than 10, but less than 1000 h/yr. Zone 2: Explosive atmosphere for less than 10h/yr, but still sufficiently likely as to require controls over ignition sources.

Does IIC cover IIB?

Class IIC also covers classes IIB and IIA. * Normally refers to the maximum ambient temperature of the installation. The lower is the ignition temperature of the related explosive atmosphere, the higher should be the maximum allowed surface temperature of the housing.

What is a Zone 2 hazardous area?

Zone 2 is a place in which an explosive atmosphere is not likely to occur in normal operation but, if it does occur, will persist for a short period only. These areas only become hazardous in case of an accident or some unusual operating condition.

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.

What is a Class 2 Division 2.1 hazardous material?

Division 2.1: Flammable Gases. These gases are known to ignite on contact with ignition sources. This includes acetylene, hydrogen, propane and many others.

What are the divisions of class 2 gases?

Class 2 has three divisions: Flammable (also called combustible), Non-Flammable/Non-Poisonous, and Poisonous.

What are Table 2 hazardous materials?

Category of material (Hazard class or division number and additional description, as appropriate)Placard name4.1FLAMMABLE SOLID4.2SPONTANEOUSLY COMBUSTIBLE5.1OXIDIZER5.2 (Other than organic peroxide, Type B, liquid or solid, temperature controlled)ORGANIC PEROXIDE

What is meant by 1st division?

Definition of first division : the highest ranking half of a sports league specifically : the five leading baseball teams in each of the major leagues.

Is division and Class same?

As nouns the difference between class and division is that class is (countable) a group, collection, category or set sharing characteristics or attributes while division is (uncountable) the act or process of dividing anything.

What is social class divide?

Social Class refers to divisions in society based on economic and social status. People in the same social class typically share a similar level of wealth, educational achievement, type of job and income.

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.

Is NEMA 4 outdoor rated?

Type 4: Weather tight (weatherproof) enclosures. Constructed for either indoor or outdoor use to provide a degree of protection against falling dirt, rain, sleet, snow, windblown dust, splashing water, and hose-directed water.

Is ATEX intrinsically safe?

Intrinsic safety is widely used in Europe as a means of installing equipment in hazardous areas, and ATEX deals extensively with intrinsic safety. … ATEX is a European standard developed in part by the International Electrotechnical Commission (IEC).

Are mobile phones intrinsically safe?

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