Area classification
In electrical engineering, a hazardous location is defined as a place where concentrations of flammable gases, vapors, or dusts occur. Electrical equipment that must be installed in such locations is especially designed and tested to ensure it does not initiate an explosion, due to arcing contacts or high surface temperature of equipment.
For example a household light switch may emit a small, harmless visible spark when switching; in an ordinary atmosphere this arc is of no concern, but if a flammable vapor is present, the arc might start an explosion. Electrical equipment intended for use in a chemical factory or refinery is designed either to contain any explosion within the device, or is designed not to produce sparks with sufficient energy to trigger an explosion.
Many strategies exist for safety in electrical installations. The simplest strategy is to minimize the amount of electrical equipment installed in a hazardous area, either by keeping the equipment out of the area altogether or by making the area less hazardous by process improvements or ventilation with clean air. Intrinsic safety, or non-incendive equipment and wiring methods, is a set of practices for apparatus designed with low power levels and low stored energy. Insufficient energy is available to produce an arc that can ignite the surrounding explosive mixture. Equipment enclosures can be pressurized with clean air or inert gas and designed with various controls to remove power or provide notification in case of supply or pressure loss of such gases. Arc-producing elements of the equipment can also be isolated from the surrounding atmosphere by encapsulation, immersion in oil, sand, etc. Heat producing elements such as motor winding, electrical heaters, including heat tracing and lighting fixtures are often designed to limit their maximum temperature below the autoignition temperature of the material involved. Both external and internal temperatures are taken into consideration.
As in most fields of electrical installation, different countries have approached the standardization and testing of equipment for hazardous areas in different ways. As world trade becomes more important in distribution of electrical products, international standards are slowly converging so that a wider range of acceptable techniques can be approved by national regulatory agencies.
Area classification is required by governmental bodies, for example by the U.S. Occupational Safety and Health Administration and compliance is enforced.
Documentation requirements are varied. Often an area classification plan-view is provided to identify equipment ratings and installation techniques to be used for each classified plant area. The plan may contain the list of chemicals with their group and temperature rating, and elevation details shaded to indicate Class, Division(Zone) and group combination. The area classification process would require the participation of operations, maintenance, safety, electrical and instrumentation professionals, the use of process diagrams and material flows, MSDS and any pertinent documents, information and knowledge to determine the hazards and their extent and the countermeasures to be employed. Area classification documentations are reviewed and updated to reflect process changes.

This is an excerpt from the article Area classification from the Wikipedia free encyclopedia. A list of authors is available at Wikipedia.
The article Area classification at en.wikipedia.org was accessed 230 times in the last 30 days. (as of: 11/13/2013)
Images on Area classification
Preview image:
Original:
Search results from Google and Bing
1
>30
1
Hazardous Areas Classification - North America
North American hazardous locations classification in classes, divisions and groups.
www.engineeringtoolbox.com/hazardous-areas-classification-d_345.html
2
>30
2
Electrical equipment in hazardous areas - Wikipedia, the free ...
[edit]. Another important consideration is the temperature classification of the electrical equipment. The surface ...
en.wikipedia.org/wiki/Electrical_equipment_in_hazardous_areas
3
>30
3
Hazardous (Classified) Locations - OSHA
One of the purposes of this discussion is to explain this classification system. .... How would we classify a storage area where LP gas is contained in closed tanks  ...
www.osha.gov/doc/outreachtraining/htmlfiles/hazloc.html
4
>30
4
Area Classification - IECEx
Area classification. Why ? A brief history of accidents th th. Severe accidents in coal mines occurred through the world in the 19th and 20th.
www.iecex.com/dubai/speakers/Day%202_0830-0915_IECEx_Dubai_Area_Classif_final_Leroux_P.pdf
5
>30
5
Hazardous Area Classifications and Protections - Documentation ...
www.Fisher.com. Hazardous Area classifications and. Protections. The intent of this document is to provide a broad overview of hazardous Area classifications ...
www.documentation.emersonprocess.com/groups/public/documents/bulletins/d103222x012.pdf
6
>30
6
Hazardous Area Classification and Control of Ignition Sources - HSE
technical measures document on the subject of hazardous Area classification/ flameproofing.
www.hse.gov.uk/comah/sragtech/techmeasareaclas.htm
7
>30
7
Explosive Atmospheres – Classification of Hazardous areas ... - HSE
Hazardous Area classification is used to identify places where, because of the ... Hazardous Area classification should be carried out as an integral part of the.
www.hse.gov.uk/fireandexplosion/zoning.pdf
8
>30
8
Hazardous Area Basics - Hexagon Technology
Hazardous Area Basics, Temperature Classes. Area. ATEX Directives, Types ... equipment marking, ATEX, DSEAR, Area classification, Types of Protection etc.
www.hexagontech.co.uk/hazard_basics.htm
9
>30
9
HAZARDOUS AREA TECHNICAL GUIDE - Redapt
A “hazardous area” is defined as an area in which the atmosphere contains, or may ... or fibre. The classification of these hazardous is primarily divided into two.
redapt2.axcess10.com/assets/186/redapt_hazardous_area_guide.pdf
10
>30
10
CLASS I AREA CLASSIFICATION A Practical Approach
May 25, 2012 ... established and documented by a professional engineer under the engineer's seal and signature shall be the Area classification. (2) Where a ...
sas.ieee.ca/pesias/seminar_slides/Area%20Classification%20IEEE%20Calgary%20Edmonton%20R1.pdf
Search results for "Area classification"
Google: approx. 51.600.000
Area classification in science
Dan Vickers' National Classification of Census Output Areas: Data
Output Area classification. ... The classification is a joint project between the School of Geography, University of Leeds and the Office for National Statistics ( ONS) ...
Output Area Classification User Group – OAC
Feb 17, 2012 ... A joint project has been set up between ONS and University College London to develop a new UK Output Area classification, for which we are ...
Output Area Classification User Group – OAC » Papers
Singleton, A.D., Davidson-Burnette, G., Longley, P. (2007) University Market Area ... the National Classification of Census Output Areas, Population Trends, 125.
Output Area Classification User Group – OAC » Blog Archive ...
Jun 16, 2009 ... 14.10 – 14.35 – I'nt Maps Brilliant (Dan Vickers, University of Sheffield) ... The system allows policy users to analyse their areas using OAC, the ...
User Engagement on a new United Kingdom Output Area ...
As part of a joint project, ONS and University College London (UCL) are consulting on plans for a new UK Output Area classification. The original classification ...
Area and rural-urban classifications - ONS
There are three main types of Area classification used to support the production of ... ONS and University College London user consultation on a new United ...
2011 Area Classifications - ONS
An external partner, University College London is currently working on producing an updated 2011 Census Output Area classification for the UK using 2011 ...
[PDF]User Engagement on a new UK Output Area Classification
London (UCL) to create a new Output Area classification (OAC) using 2011 ... classification was created for the ONS by Dr Daniel Vickers at the University of ...
2001 Output Area Classification - ONS
There is also a link to the University of Leeds School of Geography. ... Creating the National Classification of Census Output Areas: Data, Methods and Results.
QS Intelligence Unit | QS Classifications
Four categories based on the institution's provision of programs in the five broad faculty areas used in the university rankings. Due to radically different ...
Books on the term Area classification
Electrical Installations in Hazardous Areas
Electrical Installations in Hazardous Areas
Alan McMillan, 1998
3 Introduction In Chapter 2 the mechanizms associated with Area classification, together with the constitution of teams to carry it out, and the detail of information necessary to produce an Area classification were examined. This chapter will now ...
Area 51 (Images of Aviation)
Area 51 (Images of Aviation)
Peter W. Merlin, 2011
Peter W. Merlin has authored numerous books and articles on aerospace history and technology. He has appeared in documentary television programs for Discovery Channel, the History Channel, National Geographic, and others, including Modern Marvels, Mystery Hunters, Inside Area 51, Return to Area 51, Atomic Journeys, Area 51 Declassified, and The Tru...
Hazardous Area Classification in Petroleum and Chemical ...
Hazardous Area Classification in Petroleum and Chemical ...
Alireza Bahadori, 2013
Measurement comes to hazardous dust Area classification. ISA Transactions 10 ( 3), 224–230. Nieuwmeyer, H. 1997. Hazardous Area classification, whose job is it ? Rules and regulations are nothing but the scar tissue of past mistakes.
Area 51: An Uncensored History of America's Top Secret Military Base
Area 51: An Uncensored History of America's Top Secret Military Base
Annie Jacobsen, 2012
"Cauldron-stirring. [AREA 51] is not science fiction. It is an assertive account, revelatory ... Ms. Jacobsen has put together a set of strong allegations about Area 51's covert history ... Her research into the world of 'overhead,' the aerial espionage that needed to be developed in extreme secrecy, is compellingly hard-hitttin...
Practical Electrical Equipment and Installations in ...
Practical Electrical Equipment and Installations in ...
Geoffrey Bottrill, Derek Cheyne, G Vijayaraghavan, 2005
Whereas before no external gas hazard need have been considered, the mechanism of the thread is considered a source of potential weakness. It may result in the classification of the immediate area as a Zone 1 and an extended Zone 2.
Moon Bay Area Biking: 60 of the Best Rides for Road and Mountain Biking (Moon Outdoors)
Moon Bay Area Biking: 60 of the Best Rides for Road and Mountain Biking (Moon Outdoors)
Ann Marie Brown, 2012
The author of 13 outdoor guidebooks, Ann Marie Brown is a dedicated California outdoorswoman. She hikes, bikes, and camps more than 150 days each year in an effort to avoid routine, complacency, and getting a real job.Ann Marie's work has appeared in Sunset, VIA, Backpacker, and California magazines. As a way of giving back a little of what sh...
Recognizing Catastrophic Incident Warning Signs in the ...
Recognizing Catastrophic Incident Warning Signs in the ...
CCPS, 2013
Electrical l harardous Area classification drawings are used to allocate the type of electrical equipment that may be used in a particular section of a facility. Electrical Area classification is a risk-based system that examines the fire hazard from a ...
An Area of Darkness
An Area of Darkness
V.S. Naipaul, 2002
“Whatever his literary form, Naipaul is a master.” –The New York Review of Books“This is India. I don’t know any other book that comes so near to capturing the whole crazy spectrum. . . . Brilliant.” –John Wain, The Observer“His narrative skill is spectacular. One returns with pleasure to the slow hand-in-hand revelation of both India and himself. ...
Nightstalkers (Area 51: The Nightstalkers, Book One)
Nightstalkers (Area 51: The Nightstalkers, Book One)
Bob Mayer, 2012
"Bob Mayer’s Nightstalkers grabs you by the rocket launcher and doesn’t let go. Fast-moving military SF action—just the way I like it. Highly recommended." -B.V. Larson
Development of Google searches


Blog posts on the term
Area classification
2011 Census Output Area Classification | SASPAC
A new 2011 UK Output Area classification (OAC) is currently being produced through a collaborative project between the Office for National Statistics and University College London. Due to the timing of the data releases in Northern Ireland and Scotland, a preliminary OAC has been constructed for England & Wales. ONS/UCL are currently seeking users' views…
saspac.org/2013/09/25/2011-census-output-area-classification/
APA approved a new 23,000-acre Hudson Gorge Wilderness area and 9,940-acre motorless Primitive Area for Essex Chain Lakes | Protect the Adirondacks!
www.protectadks.org/2013/12/apa-approved-a-new-23000-acre-hudson-river-wilderness-area-and-9940-acre-motorless-primitive-area-for-essex-chain-lakes/
Hazardous Area Classification Of Combustion Systems - Industrial Professionals - Cheresources.com Community
Hazardous Area classification Of Combustion Systems - posted in Industrial Professionals: Hello All, I would like to raise a discussion point about hazardous Area classification when applied to combustion equipment. Generally speaking codes such as IP15, NFPA and UK HSE guidance etc imply that HAC cannot sensibly be applied close to combustion equipment since such equipment is inevitably hot and other measures to minimize leaks etc should be adopted. It is also g...
www.cheresources.com/invision/topic/19034-hazardous-area-classification-of-combustion-systems/
Hazardous Area Classification in Petroleum and Chemical Plants: A Guide to Mitigating Risk [PDF] | caryljohnstone62171
download link: http://bit.ly/19kjwgF -area-... Hazardous Area classification in Petroleum and Chemical Plants: A Guide to Mitigating Risk by Alireza Bahadori [PDF] Due to an increase in the wide-range of chemicals in petrochemical processing industries, as well as frequency of use, there has been a steady rise in flammability problems and other hazards. Hazardous Area classification
caryljohnstone62171.wordpress.com/2013/12/12/hazardous-area-classification-in-petroleum-and-chemical-plants-a-guide-to-mitigating-risk-pdf/
New state classification system improves area schools' standings
EIGHT KINGSTON district schools, two Hyde Park district schools, and all three Catskill district schools this week were labeled 'focus schools' by the state Education Department, a classification that replaces accountability statuses like 'in need of imp
www.dailyfreeman.com/general-news/20120902/new-state-classification-system-improves-area-schools-standings
IGE SR 25 Hazardous Area Classification of Natural Gas Installations
Maybe anyone having IGE/SR/25 "Hazardous Area classification of Natural Gas Installations" could upload it. Thanks in advance.
www.egpet.net/vb/threads/70847-IGE-SR-25-Hazardous-Area-Classification-of-Natural-Gas-Installations
Where area teams will fit into the new UIL football conferences - The Huddle
blog.beaumontenterprise.com/huddle/2013/12/02/where-area-teams-will-fit-into-the-new-uil-football-conferences/
Labor Department Is Digging Into Worker Classifications — Again
By John E. Thompson The U.S. Department of Labor has announced another proposal to conduct a survey relating to
www.tlnt.com/2013/11/15/labor-department-is-digging-into-worker-classifications-again/
UIL releases classification cutoffs for 2014-16 realignment; Highland Park will move up to new 6A | Dallas Morning News
By Matt Wixonmwixon@dallasnews. com9:08 am on December 2, 2013 | Permalink.
highschoolsportsblog.dallasnews.com/2013/12/uil-releases-classification-cutoffs-for-2014-16-realignment-highland-park-will-move-up-to-new-6a.html/
123