Electrical equipment in hazardous areas | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-01-13

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Electrical_equipment_in_hazardous_areas


00:01:30 1 Electrical ignition hazard
00:04:39 2 History
00:06:54 3 Division and Zone classification systems
00:08:12 3.1 Explosive gas area classifications
00:11:05 3.2 Explosive dust area classifications
00:13:32 4 Gas and dust groups
00:16:05 5 Temperature classification
00:16:54 5.1 Auto-ignition temperatures
00:17:39 5.2 Auto-ignition temperatures (dust)
00:17:50 6 Type of protection
00:18:38 6.1 Multiple protection
00:19:07 7 Equipment protection level
00:19:29 8 Equipment category
00:20:00 9 Labeling
00:20:17 9.1 Europe
00:21:57 9.2 North America
00:23:38 10 See also



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SUMMARY
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In electrical engineering, hazardous locations (sometimes abbreviated to HazLoc, pronounced Haz·Lōk) are defined as places where fire or explosion hazards may exist due to flammable gases, flammable liquid–produced vapors, combustible liquid–produced vapors, combustible dusts, or ignitable fibers/flyings present in the air in quantities sufficient to produce explosive or ignitable mixtures. Electrical equipment that must be installed in such classified locations should be specially designed and tested to ensure it does not initiate an explosion, due to arcing contacts or high surface temperature of equipment.
The introduction of electrical apparatus for signaling or lighting in coal mines was accompanied by electrically-initiated explosions of flammable gas and dust. Technical standards were developed to identify the features of electrical apparatus that would prevent electrical initiation of explosions due to energy or thermal effects. Several physical methods of protection are used. The apparatus may be designed to prevent entry of flammable gas or dust into the interior. The apparatus may be strong enough to contain and cool any combustion gases produced internally. Or, electrical devices may be designed so that they cannot produce a spark strong enough or temperatures high enough to ignite a specified hazardous gas. Integrating these types of motors can ensure that equipment, facilities, and workers stay protected and machinery is not damaged.