Hazardous Location Types | Guardian Equipment (2024)

FAQs

What is the classification of equipment enclosures for hazardous locations? ›

For Class I locations, use explosion-proof equipment and proper ventilation to handle flammable gases or vapors. Class II locations require dust-tight equipment and dust control to manage combustible dust hazards. In Class III locations, protect against ignitable fibers with proper enclosures and handling protocols.

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.

Electrical equipment permitted for use in hazardous locations must be marked to show the Class, Division (or Zone under NEC Article 505 and CE Section 18), Group, and maximum surface operating temperature or temperature code referenced to a 40°C (104°F) ambient temperature (some exceptions apply).

NFPA 70 NEC Classes, Divisions and Groups

In 29 CFR 1910.307(c)(2)(ii), OSHA requires all equipment used in a hazardous location to be marked with the class, group and operating temperature or temperature range for which it is approved.

A Hazardous Area is defined by three main criteria, these being: The type of hazard (groups) The auto-ignition temperature of the hazardous material (temperature or “T” rating) The likelihood of the hazard being present in flammable concentrations (zones)

A visor card guide for state and local law enforcement officials illustrating vehicle placarding and signage for the following nine classes of hazardous materials: 1) Explosives, 2) Gases, 3) Flammable Liquid and Combustible Liquid, 4) Flammable Solid, Spontanaeously Combustible and Dangerous When Wet 5) Oxidizer and ...

Definition. A liquid having a flash point of not more than 60o C (140o F), or any material in a liquid phase with a flash point at or above 37.8o C (100o F) that is intentionally heated and offered for transportation or transported at or above its flash point in a bulk package.

These specialized areas contain materials that, due to their nature, can lead to fires, explosions, or other hazardous incidents. Understanding these locations is important to ensure the well-being of workers and the integrity of operations.

Hazardous locations are broken down into three sections known as Classes: I, II, and III. Each Class's rating is dependent upon specific conditions which are further determined by divisions and groups. Otherwise, classes are identified as follows: Class I: Gasses, vapors, and liquids.

The first step in identifying a hazardous area is determining if there is likely to be a potentially explosive atmosphere present. This requires a good knowledge of the process, the equipment or apparatus used, the chemicals used, and the materials produced or generated.

What are the NEC hazardous locations? ›

The National Electric Code (NEC) or NFPA 70 defines hazardous locations as those areas where fire or explosion hazards may exist due to flammable gases or vapors, flammable liquids, combustible dust, or ignitable fibers or flyings.

Final answer: The primary danger in a hazardous classified location typically involves the potential for physical harm, including fires, explosions, or exposure to harmful substances.

Identified (for the use).

Suitability of equipment for a specific purpose, environment, or application is determined by a qualified testing laboratory where such identification includes labeling or listing.

HazLoc certification is a confirmation that minimum relevant safety standards have been met and the products can be used safely in the designated hazardous locations for which the product has been evaluated.

OSHA & NEC 1999, Section 110.3 (B) Installation and Use. Listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling.

Class 2 dustproof enclosures are vital in a variety of hazardous facilities to reduce risk of explosions from combustible dust.

The Class/Division/Group system uses three designators to categorize hazardous areas: Class:The Class designator defines the general nature of the hazard, such as its state of matter or form. Division:The Division designator indicates the probability of a hazard igniting or producing an explosion.

Locations shall be classified depending on the properties of the flammable vapors, liquids, or gases that may be present and the likelihood that a flammable or combustible concentration or quantity is present. Where pyrophoric materials are the only materials used or handled, these locations need not be classified.

Class 1 Hazardous Locations refer to facilities that deal with flammable gases, vapors, and liquids. Division 2 specifies that flammable materials are handled, processed, or used at a location. But, concentrations of hazardous substances are not high enough to be ignitable.