What is ordinary hazard?

What is ordinary hazard?

Ordinary hazard (Group 1) occupancies shall be defined as occupancies or portions of other occupancies where combustibility is low, quantity of combustibles is moderate, stockpiles of combustibles do not exceed 8 ft (2.4 m), and fires with moderate rates of heat release are expected.

What is a Class 4 sprinkler system?

Class IV encompasses all items that belong to Classes I, II, and III. Group A plastics also fall under this category, determined by how much needs to be stored.

What is low hazard occupancy?

Class 6. Occupancies in this class are considered LOW hazard occupancies, where quantity and combustibility of contents are moderate. Any fire would tend to develop at a moderate rate and have moderate rates of heat release.

Is an electrical room ordinary hazard?

Most designers will classify the IT equipment room as Ordinary Hazard Group 1, as defined by NFPA 13. IT equipment rooms and IT equipment areas located in a nonsprinklered building also must be provided with an automatic sprinkler system, a gaseous clean agent extinguishing system, or both.

What are some examples of ordinary hazard occupancies?

A moderate to high rate of heat release is expected. The materials may cause rapid fire development. Automotive garages, bakeries, laundries, and machine shops are considered ordinary hazards, as are manufacturing facilities, paper mills, print and publishing establishments, warehouses, and other industrial properties.

What are Class 3 commodities?

A Class III commodity is defined as a product fashioned from wood, paper, natural fibers, or Group C plastics with or without cartons, boxes, or crates.

What is a Class B hazard?

In fire classes, a Class B fire is a fire in flammable liquids or flammable gases, petroleum greases, tars, oils, oil-based paints, solvents, lacquers, or alcohols.

What are the 3 types of conventional sprinkler systems?

3 Types of Fire Sprinkler Systems

  • Wet Fire Sprinkler System. A wet fire sprinkler system is one of the most common options on the market.
  • Dry Fire Sprinkler System. A dry fire sprinkler system is filled with pressurized air, rather than water.
  • Preaction Fire Sprinkler System.

What are the types of sprinklers?

Let’s discuss four types of sprinkler systems and their best uses.

  • Wet Pipe Commercial Sprinkler System. Wet Pipe Systems include overhead piping filled with water under pressure.
  • Dry Pipe Commercial Sprinkler System.
  • Pre-Action Commercial Sprinkler System.
  • Foam Water Commercial Sprinkler System.

What are Group A plastics?

The storage of Group A Plastics, such as ABS, acetal, acrylic, butyl rubber, EPDM (ethylene propylene rubber), FRP (fiberglass reinforced polyester), expanded natural rubber, nitrile rubber, PET, polybutadiene, polycarbonate, polyester based elastomers, polyethylene, polypropylene, polystyrene (expanded or unexpanded).

Should electrical rooms be sprinklered?

According to NEC 110.26 (also known as NFPA 70), automatic sprinkler installation is allowed in electrical rooms where equipment is 600V or less, except for certain spaces called “Dedicated Electrical Space.” These spaces are directly above the electrical equipment (please refer to NEC 110.26 for exact definition).

What is an ordinary hazard group 2 occupancy?

Ordinary hazard Group 2 occupancies include the aforementioned dry cleaners, automobile repair and services areas, auditorium stages, woodworking plants, post offices, and stack room areas of libraries. Standard sprinklers protecting all ordinary hazard occupancies shall not cover an excess of 130 square feet per head (Table (b).

What is a hazardous Group 3 organism?

Hazard Group 3. A category of microorganisms from the UK’s Advisory Committee on Dangerous Pathogens which corresponds to Biohazard Level 3 organisms, which the ACDP defines as biological agents that can cause severe human disease and present a serious hazard to employees.

What is a group 1 fire hazard?

Extra Hazard (Group 1) — This classification applies to spaces where the quantity and combustibility of contents are very high and dust, lint, or other materials are present, which introduce the probability of fires that burn hot and spread fast, such as upholstery shops, sawmills, plywood manufacturers, or textile factories.

What are occupancy and commodity classifications for fire sprinklers?

Before designing and installing any fire sprinkler system, the occupancy and commodity classifications must be determined for the area to be protected. These classifications are critical to ensuring the system design will provide adequate protection in the event of a fire.

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