How are hazardous locations determined?

Hazardous areas are classified into zones based on an assessment of the frequency of the occurrence and duration of an explosive gas atmosphere, as follows: 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.

How do you classify a hazardous area?

Hazardous area classification divides areas in to Zones based on the likely frequency and duration of a release, release rate, concentration, velocity and ventilation of the area.

What are Class 1 hazardous locations?

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 do you understand by hazardous area with respect to electrical installations?

In brief, hazardous locations are classified as either Class 1 ‘Division 1’, where ignitable concentrations of flammable gases or vapours may be present during normal operation, or ‘Division 2’, where flammable gases or vapours occur in ignitable concentrations only in the event of an accident or a failure of a …

What is meant by hazardous area?

A “hazardous area” is defined as an area in which the atmosphere contains, or may contain in sufficient quantities, flammable or explosive gases, dusts or vapours. In such an atmosphere a fire or explosion is possible when three basic conditions are met.

What is an electrically classified area?

Electrical area classification (EAC) is the process of determining the existence and extent of hazardous locations in a facility containing any flammable and combustible chemicals. …

What are the hazardous areas in the house?

7 Common Safety Hazards Around Your Home

• Fire Hazards. Believe it or not, there are fire hazards all over your home, and many of them are electrical.
• Carbon Monoxide. Every year, around 200 people die from carbon monoxide poisoning.
• Sharp Objects.
• Toxic Substances.
• Stoves.
• Outdoors.
• Bathrooms.

What is a Class 3 hazardous location?

Class III hazardous locations, according to the NEC, are areas where there are Easily ignitable fibers or flyings present, due to the types of materials being handled, stored, or processed.

What do you mean by hazardous area?

What is a Zone 2 hazardous area?

Zone 2 is a place in which an explosive atmosphere is not likely to occur in normal operation but, if it does occur, will persist for a short period only. These areas only become hazardous in case of an accident or some unusual operating condition.

What is non hazardous area?

An area in which an Explosive Gas Atmosphere is not expected to be present, in quantities such as to require special precautions for the construction, installation and use of apparatus.

Is Diesel considered a hazardous location?

How does the Code address diesel fuel dispensers as they relate to hazardous locations? A. The hazardous Class I location requirements contained in Art. The flash point of diesel fuel is 100°F or above; thus, the area involving diesel fuel is typically not a classified location.

What is a hazardous location?

The National Electrical Code (NEC) 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.”

What are the requirements for electrical installations in hazardous areas?

Electrical installations. Equipment, wiring methods, and installations of equipment in hazardous (classified) locations shall be approved as intrinsically safe or approved for the hazardous (classified) location or safe for the hazardous (classified) location. Requirements for each of these options are as follows: Intrinsically safe.

Can equipment approved for a Class 1 hazardous location be used?

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 classes of NEC 70 hazardous locations?

NFPA 70 NEC Hazardous Locations Classes, Divisions and Groups Class Group I – Flammable gases or vapors may be pre Group A – Acetylene Group B – hydrogen, II – Combustible dust may be present E – Combustible metal dusts: aluminum, c III – Easily ignitable fibers or flyings Not Applicable