There are lot a of industrial locations that require ex […]
There are lot a of industrial locations that require explosion proof rated housings and security cameras. Those locations might have hazardous gases, chemical or vapors that regular standard housings would not be able to withstand. This might cause an explosion due to electrically charged components within the cameras.
Cautions must be taken at plants, factories or locations that produce by-products of flammable gases, flammable liquid–produced vapors, combustible liquid–produced vapors, combustible dusts, or ignitable fibers present in the air in quantities sufficient to produce explosive or ignitable mixtures. Electrical equipment, low or high voltage, that must be installed at such classified locations should be specially designed and tested to ensure it does not initiate an explosion or fire.
Engineers, along with policy regulators, defined technical specifications to identify features of electrically charged devices that need to be protected from surrounding environments to avoid initiation of an electric charge. For example, a simple house light bulb that emits a small electric arc might seem harmless for a house but would be quite explosively dangerous for irregular atmospheres that have flammable vapors.
Historically, the requirement for explosion proof rated devices started when at least two explosion related coal mines were attributed to an electric bell signaling system. An electric arc by the bell system sparked the mine which caused a huge explosion killing many miners. High levels of methane gas and coal dust in coal mines make them incredibly dangerous to have any minute electric arcs.
Explosion proof rating and installation requirements are classified by the National Electric Code (NEC), NFPA 70, as published by the National Fire Protection Association.