Articles 500 through 504 cover the requirements for electrical and electronic equipment and wiring for all voltages in class i, divisions 1 and 2; Division 1 locations are defined as an area where the amount of combustible dust is either suspended in the air or accumulated on surfaces in a sufficient concentration to allow for ignition.
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Are divisions and zones equivalent to one another?
Class ii division 2 hazardous locations. Information required to specify an electric motor for use in hazardous locations. Class ii, divisions 1 and 2; Osha publication 3073 defines a hazardous location as follows:
In hazardous locations, specially designed equipment and special installation techniques must be used to protect Division classification of the hazardous environment. (c) identification of a class ii location.
Class ii locations consist of locations where combustible dusts may exist that have the potential to become flammable or ignitable. A class ii, division 1 location is an Class ii locations are those in which combustible dust may be found.
According to article 500 of the nec, one of the following three situations must exist in order to be classified as a class i division ii location: Some motors may be approved for both class i and ii locations. Class of materials in the hazardous environment.
Locations that would be considered to be class ii include grain elevators, flour and feed mills, metal powder manufacturers, and coal plants, etc. Note to the definition of class ii, division 2: this classification includes locations where dangerous concentrations of suspended dust would not be likely, but where dust accumulations might form on or in the vicinity of electric equipment. Four basic information are required to specify and select the right motor for use in a hazardous environment:
The fact that there is some combustible dust present does not mean a class ii hazardous location exists. Locations that are hazardous because of the presence of combustible dust. Groups a, b, c, and d are used for
What is class i division ii? Class ii locations* combustible dusts / hazardous substances. Class i and class ii locations are further divided into groups based on the behavior of the hazardous material after it has been ignited.
Cables must comply with their respective nec articles and should be listed but in division 2 locations it is not necessary that they be listed for hazardous locations. For definitions of these locations see 1926.449. Hazardous because flammable gases or vapors are present (or may be present) in quantities sufficient to produce explosive or ignitable mixtures.
When comparing divisions and zones, division 2 is equivalent to zone 2, but division 1 is equivalent to either zone 0 or 1. Hazardous because combustible or conductive dusts are present (or may be present) in quantities sufficient to produce explosive or ignitable mixtures. Intrinsic safety intrinsically safe (is) cabling can easily be installed in class i, divisions 1 and 2 and class ii, divisions 1 and 2 locations, but the installation must comply with article 504.
Intertek guide to explosive atmosheres and hazardous locations 7 typical nec marking nec 500 nec 505 class i, zone 0, aex ia iic t4 hazard class protection concept code area classification approved to us standards class i, division 1, groups a&b t4 temperature class gas group hazard This label identifies the motor as having been designed for operation in class i or class ii locations. These areas may contain equipment from which appreciable quantities of dust would escape under abnormal operating conditions or be adjacent to a.
Class ii division 2 is where the dust material is stored or handled other than in the process of manufacturing. Equipment approved for use in class i hazardous locations cannot be used in class ii hazardous locations. Just as in class i, division 1 and 2, the subdivision of class ii into divisions 1 and 2 identifies the likelihood that there is an explosion hazard.
Note that the dust must be present in sufficient quantities for a fire or explosion hazard to exist. Class ii division 1 is in an area where dust material is handled, manufactured, or used. Nec and ul segregate this hazardous location into two divisions.
The risk associated with using a portable cellular phone in a class i, division 2 or zone 2 hazardous location is evaluated. Each room, section or area shall be considered individually in determining its classification. Class ii locations are those where the presence of combustible dust may be suspended in the air or accumulates on electrical equipment in quantities sufficient to ignite or explode.
These hazardous (classified) locations are assigned six designations as follows: Hazardous locations are areas where flammable liquids, gases or vapors or combustible dusts exist in sufficient quantities to produce an explosion or fire. Class nature of hazardous material;
The class identifies the physical characteristics of the hazardous materials present at the location where the motor will be used. Class ii refers to combustible or conductive dust particles that are or may be present in the atmosphere in significant enough quantities to produce a fire or explosion if ignited. Class i, division 1 class i, division 2 class ii, division 1 class ii, division 2 class iii, division 1 class iii, division 2.
Class ii is further broken down into two divisions. In reference to possible danger, class i is defined as a hazardous location in which flammable gas or vapor may be present in sufficient quantities to be considered ignitable or explosive.
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