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 the difference between Class 2 Division 1 and 2?
The class II division 2 differs from division 1 by the following characteristic: the discrepancy between the upper and lower teeth does not match the discrepancy between the upper and lower teeth where the molars and canines are located (red and blue arrows).
What is a Class 2 Division 1 malocclusion?
In Class II division 1 malocclusion, the overjet is excessive, and is usually associated with a deep bite, causing esthetic and functional problems that require orthodontic treatment.
What is a Class II Division I bite?
Class II division 1. A class II intermaxillary dental relationship represents a posterior discrepancy of the lower teeth with regard to the upper teeth. The embrasure between the lower canine and the lower first premolar is shifted backward with regard to the upper canine (blue arrows).
What is a Class 1 Division 1 area?
Explosive gas A Class I, Division 1 area encompasses the combination of Zone 0 and Zone 1 areas. An area where ignitable concentrations of flammable gases, vapors or liquids are likely to exist under normal operating conditions. As a guide for Zone 1, this can be defined as 10–1000 hours/year or 0.1–10% of the time.
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.
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 a Class 2 dental?
Class 2: Patient with an oral condition that has the potential but is not expected to result in dental emergencies within a 12 month period. Class 3: Patient with an oral condition that, if not treated, is expected to result in dental emergencies within the next 12 months.
What does class 3 malocclusion mean?
Class III malocclusion represents a complex three-dimensional facial skeletal imbalance between maxillary and mandibular growth along with varying degrees of dentoalveolar and soft tissue compensations which can be expressed in many morphological ways.44 Class III malocclusion may be associated with maxillary growth …
What does a class 2 bite look like?
Class II is where the lower first molar is posterior (or more towards the back of the mouth) than the upper first molar. In this abnormal relationship, the upper front teeth and jaw project further forward than the lower teeth and jaw. There is a convex appearance in profile with a receding chin and lower lip.
What is Class 1 Division 2 and ATEX Zone 2?
Assured Systems sell a wide range of industrial computing products certified for Class 1 / Division 2 and ATEX Zone 2 areas. Assured Systems sell a wide range of industrial computing products certified for Class 1 / Division 2 and ATEX Zone 2 areas. Explosions can cause significant damage along with severe injury or worse loss of life.
What’s the difference between Div 1 and Div 2?
This is where the Divisions come in. “Div 1” means that these ignitable elements can exist during normal operations, as opposed to “Div 2” which means it’s possible, but not likely.
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?
What are the sub divisions of Class 2 dangerous gases?
There are 3 sub-divisions: 1 Division 2.1: Flammable gases 2 Division 2.2: Non-flammable, non-toxic gases 3 Division 2.3: Toxic gases
