What is a Class 2 hazardous 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.
What is a Class 2 electrical device?
A Class II appliance usually has a plastic cover. The only way to accurately identify it is to look for the Class II appliance symbol. Examples of Class II appliances are hair dryers, DVD players, televisions, computers, and photocopiers. Class II appliances have two layers of insulation.
What is class II construction?
The NEC (National Electric Code) identification of Class 2 refers to the output voltage and power capabilities of ac-dc supplies, while the IEC (International Electrotechnical Commission) designator of protection, Class II, refers to a power supply’s internal construction and electrical insulation.
What is Class II and Class III in hazardous location?
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 Class I Div II?
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 the difference between Class 1 Div 1 and Div 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 are Class I II and III medical devices?
Class II devices are intermediate-risk devices. Examples include computed tomography (CT) scanners or infusion pumps for intravenous medications. Class III devices are high-risk devices that are very important to health or sustaining life. Examples include pacemakers and deep-brain stimulators.
What is a Class 2 Pat test?
In Class 2 appliances, the user is protected by at least two layers of insulation. For this reason, Class 2 appliances are also known as Double Insulated. They do not require an earth connection. When PAT Testing Class 2 appliances, just the Insulation Resistance test is carried out.
What is a Class 2 medical device?
Class II – Most medical devices are considered Class II devices. Examples of Class II devices include powered wheelchairs and some pregnancy test kits. 43% of medical devices fall under this category. 10% of medical devices fall under this category.
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 2 Div 2 area?
Class 2 Division 2, also commonly written with a Roman numeral “Class ii Division 2”, represents an area where combustible dust may be present in quantities sufficient to ignite or explode.
Can NEMA 4X be used in Class 1 Div 2?
NEMA 4X: Provides the same protection as NEMA 4 with the inclusion of corrosion protection. ** NEMA 8: For either indoor or outdoor use in Class I, Division 2, Groups A, B, C or D hazardous locations according to NFPA 70, this is also referred to as oil immersed.
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?
Is it safe to use a Class 2 laser?
A Class 2 laser is not a skin or materials burn hazard. However, even a Class 2 laser can be a distraction, glare or flashblindness hazard for pilots and drivers. NEVER aim any laser towards an aircraft or vehicle that is in motion. This is unsafe and is illegal — you could be arrested and jailed. This is not a toy.
Can a Class 2 wire be installed inside a wall?
Class 2 In-Wall Rated Wire provides an extra layer of installation that is more resistant to cracking or melting, and is approved by the NEC to be installed inside walls. Lighting As we mentioned earlier, all low-voltage lighting fixtures must be certified by an NRTL to pass inspection.
Which is safer Class 1 or Class 2 appliances?
Class 2 appliances however always provide 2 levels of protection irrespective of the status of the wiring installation. Both layers of protection are built into the design making Class 2 appliances are a lot safer than Class 1 appliances. What does shield symbol mean in plug top power supply pic?