What is a zone classification?
The most common values used are: 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.
What is the difference between division and zone?
This is because the Division equipment for hazardous location are marked in accordance to the area that it is classified to use, whereas equipment within the Zone method is marked in accordance with the type of protection used by the equipment.
What is a Class II Division 1 location?
Class Definition 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?
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 makes a Class 1 Div 2?
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.
Is the zone system the same as class and Division?
The Zone Classification System is offered as an alternative to the Class and Division system. It is an Americanized version of the International Electrochemical Commission’s (IEC) Zone system which maintains the NEC wiring methods and protection techniques.
What are the divisions in the NEC classification system?
Divisions define the probability of a hazardous material or element being present in a surrounding atmosphere that has the ability to be ignited. They are the second tier in the NEC classification system and fall under Classes. Divisions are broken into two levels that address all hazardous materials.
What are the three groups of hazardous areas?
Group is divided in three groups where Group I is reserved for mining locations. Group II is for explosive gases (Zone 0, 1 and 2) and Group III is for explosive dusts (Zone 20, 21 and 22). susceptible to firedamp (flammable mixture of gases naturally occurring in a mine).
Can a Class 1 hazardous location be used in a Division 2 hazardous location?
If equipment has been approved for use in a Division 1 hazardous location, it can be used in a Division 2 hazardous location, providing it is in the same class and group. Q: Can equipment approved for a Class I hazardous location be used in a Class II hazardous location?