What is a Zone 1 hazardous area?
6 min read
Asked by: Barbara Rodriguez
Zone 1: An area in which an explosive gas atmosphere is likely to occur in normal operation; Zone 2: An area in which an explosive gas atmosphere is not likely to occur in normal operation and, if it occurs, will only exist for a short time.
What is Zone 2 area classification?
The definition of Zone 2 is a hazardous area classified as an atmosphere where a mixture of air and flammable substances in the form of gas, vapour or mist is not likely to occur in normal operation, but if it does occur, will persist for a short period only.
What is a Class 1 Division 1 hazardous area?
Division 1 is a subset of Class I and is classified as an area where the explosive or flammable gases, vapors or liquids mentioned above can exist under normal, everyday operating conditions.
How many zones are available as per hazardous area classification?
In order to classify this danger an installation is divided into areas of risk depending upon the amount of time the hazardous is present. These areas are referred to as Zones. For gases and vapours and dusts and fibres there are three zones.
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 the difference between Zone 1 and Zone 2?
Zone 1: An area in which an explosive gas atmosphere is likely to occur in normal operation; Zone 2: An area in which an explosive gas atmosphere is not likely to occur in normal operation and, if it occurs, will only exist for a short time.
What is hazardous zone classification?
Those areas where the possibility or risk of fire or explosion might occur due to an explosive atmosphere and/or mixture is often called a hazardous (or classified) location/area. Currently there are two systems used to classify these hazardous areas; the Class/Division system and the Zone system.
What is a Class II Division 1 location?
Class Definition
The Classes define the type of explosive or ignitable substances which are present in the atmosphere such as: • 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.
What type of wiring must be used in a Class 1 Division 1 hazardous location?
Two of the allowable wiring methods for a Class I Division 1 location are threaded rigid metal conduit (RMC) and threaded steel intermediate metal conduit (IMC).
What is a Class 1 Division 2 location OSHA?
Note to the definition of “Class I, Division 2:” This classification usually includes locations where volatile flammable liquids or flammable gases or vapors are used, but which would become hazardous only in case of an accident or of some unusual operating condition.
Is Class 1 or Class 2 better?
UL Class 1 drivers have output ranges outside UL Class 2 designations. An LED Driver with a UL Class 1 rating has a high-voltage output and safety protection is required within the fixture. A Class 1 driver can accommodate more LEDs, making it more efficient than a Class 2 driver.
What is a Class 1 Div 2 motor?
Class I, Division 2.
This classification usually includes locations where volatile flammable liquids or flammable gases or vapors are used, but which, in the judgment of the authority having jurisdiction, would become hazardous only in case of an accident or of some unusual operating condition.
Does Class 1 Division 2 require explosion proof?
A Class I Division 2 light are not held to as high of a standard as Division 1 products. To meet the requirements for Division 2, a light does not have to be able to contain an explosion. Instead, they must be found to be unable to cause an explosion in environments for which they are approved to be used.
Is NEMA 4X good for Class 1 Div 2?
We recommend electrical enclosures meet or exceed a NEMA rating of Type 4 or Type 4X for use in a Class1 Div2 hazardous location when used with appropriate purge systems.
Who is responsible for classifying hazardous areas?
In the United States, the hazardous location classification system is defined by the National Fire Protection Association (NFPA) 70®, National Electric Code® (NEC).
How do I know if my motor is explosion proof?
When a spark ignites volatile gas inside a motor, an explosion proof design contains the internal combustion to prevent a greater explosion or fire. An explosion proof motor is clearly marked with a nameplate that identifies its suitability for a given hazardous environment.
Is a Class 1 Div 1 motor explosion proof?
They must be built and labeled as explosion-proof. Class I, Division 1 motors must possess specific characteristics to be classified as explosion-proof. First, the motor must be designed to contain any internal explosions without rupturing completely.
Are brushless DC motors explosion proof?
Explosion proof DC motors can be in any wiring configuration: brushed or brushless, permanent magnet or electromagnetic field.
Is a totally enclosed motor explosion proof?
TEFC motors are not secure against high pressure water nor submersible. They are also not explosion proof without additional modifications.
What are 4 common types of motor enclosures?
The most common types of enclosures are:
- Open Drip Proof (ODP) …
- Weather Protected (WP1 / WP2) …
- Totally Enclosed Fan Cooled (TEFC) …
- Totally Enclosed Non-Ventilated (TENV) …
- Totally Enclosed Air Over (TEAO) …
- Totally Enclosed Forced Ventilated (TEFV) …
- XP (Explosion Proof)
Is a TENV motor explosion proof?
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.
Are explosion proof motors waterproof?
This metal-to-metal contact is close-fitting, but cannot seal completely. In explosion-proof designs, normal weep holes cannot be used. Thus, when an explosion-proof motor is used in a wet environment, moisture can accumulate inside of the motor and stay there for an extended period of time.
Can you use an ODP motor in the outdoors?
Any motor exceeding that temperature leads to motor failure. To put it bluntly, installing an ODP motor outside, or inside in a moderately dirty environment is a substantial waste of money. When they are not running, insects and critters seem to use these motors for nests.
What does TENV mean on a 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.
