Does Class 1 Div 2 require explosion proof motors?
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 TENV motor?
TOTALLY-ENCLOSED, NON-VENTILATED (TENV) — A totally-enclosed motor of sufficient size and mass to permit the necessary heat dissipation to eliminate the need for external cooling. TOTALLY-ENCLOSED FAN-COOLED (TEFC) — Basically a TENV motor which has an external fan to blow cooling air over the motor.
What is a Class 1 Div 2 enclosure?
So a Class 1 Division 2 Enclosure is used in facilities that deal with flammable gases, vapors, and liquid materials. Additionally, the facility handling, processing, or using the materials in the defined hazardous location contain concentrations insufficient to be ignitable.
What is a TEAO enclosure?
TEAO (Totally Enclosed Air Over) This enclosure is similar to TEFC but does not have its own cooling fan, rather it sits in an airstream such as in a ventilating duct. Most often, this motor is powering a direct-coupled fan and is mounted right in the air duct that it is blowing air through.
What does TEAO mean?
Totally Enclosed
TEAO: Totally Enclosed, Air Over. Generally limited in nature being solely used in fan/blower applications where the motor is located with the air stream. The motor remains dust-tight while being cooled by pre-existing fans used to provide air movement for the entire application.
How do you know if a motor is explosion-proof?
An explosion proof motor is clearly marked with a nameplate that identifies its suitability for a given hazardous environment. Depending on the agency certifying the motor, the nameplate will clearly indicate the hazardous location Class, Division, and Group for which the motor is suited.
Are EC motors explosion-proof?
An EC fan has been developed for use in harsh applications with explosive atmospheres or flammable gases. Using a spark-proof IP68-ATEX rated EC fan eliminates the possibility of explosions or fires in these applications, providing maximum protection with reduced energy usage.
Can a TENV motor be used outdoors?
These motors are suitable for indoor use and clean atmospheres. Totally Enclosed, Nonvented (TENV) Motors do not have air openings. While air does not freely move between the inside and outside, the motor’s construction is not air- or liquid-tight.
Is a TENV motor explosion proof?
Totally Enclosed, Nonvented (TENV) Motors do not have air openings. Explosion-Proof (XPRF) Motors are completely enclosed to withstand an internal explosion of gas or vapor—the motor frame will not rupture or burst. Use these motors for safe operation in hazardous environments.
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 is a Class 2 enclosure?
Class II Locations: A Class II Hazardous Location is one in which combustible dust is present.
When to use a Class 1 NEMA enclosure?
At Nema Enclosures we build electrical enclosures that are suitable for a Class 1 Division II classification meaning they can be used in areas where hazardous materials are present only in an abnormal condition (less than 10% of the time). A pipe break or leak in a refinery would be considered an abnormal condition.
What does TENV ( totally enclosed non ventilated ) mean?
Based on NEMA (National Electrical Manufacturers Association) definition, TENV states that the motor housing is fully enclosed and is not ventilated with a fan. The motor is being cooled unassisted (natural convection cooling). Basically, the motor cools by releasing heat into the air and/or conducted through the mounting surface.
How does an enclosure for a motor work?
This enclosure type has an external fan which blows air across the motor frame’s external cooling fins. inside the motor recirculates and is cooled by heat transfer through the frame. Sometimes referred to as TEFV – Totally Enclosed Forced Ventilated. external cooling air brought to the motor through ducts or pipes.
What are the different classes of hazardous motor?
These hazards are separated into three different classes. You must select a motor that is properly classified for your specific application. The Class 3 motor is the least common and isn’t divided any further into groups. However, Class 1 and 2 motors are grouped by your specific hazardous substance.