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Maximum experimental safe gap (MESG) is a standardized measurement of how easily a gas flame will pass through a narrow gap bordered by heat-absorbing metal. MESG is used to classify flammable gases for the design and/or selection of electrical equipment in hazardous areas, and flame arrestor devices. [1]
Typical gas hazards are from hydrocarbon compounds, but hydrogen and ammonia are also common industrial gases that are flammable. Class I, Division 1 classified locations An area where ignitable concentrations of flammable gases, vapors or liquids can exist all of the time or some of the time under normal operating conditions.
Intrinsic safety (IS) is a protection technique for safe operation of electrical equipment in hazardous areas by limiting the energy, electrical and thermal, available for ignition. In signal and control circuits that can operate with low currents and voltages, the intrinsic safety approach simplifies circuits and reduces installation cost over ...
OSHA Publication 3120, (Revised 2002). This booklet presents OSHA's general requirements for controlling hazardous energy during service or maintenance of machines or equipment. It is not intended to replace or to supplement OSHA standards regarding the control of hazardous energy. Health and Safety Executive, Electrical safety and you, a brief ...
The directive applies to equipment as defined by a section of the WEEE directive. The following numeric categories apply: Large household appliances; Small household appliances; IT & telecommunications equipment (although infrastructure equipment is exempt in some countries) Consumer equipment; Lighting equipment – including light bulbs
Any leak which, in the judgment of operating personnel at the scene, is regarded as an immediate hazard. Escaping gas that has ignited. Any indication of gas which has migrated into or under a building, or into a foreign sub-structure. Any reading at the outside wall of a building, or where gas would likely migrate to an outside wall of a building.
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An electric arc (or arc discharge) is an electrical breakdown of a gas that produces a prolonged electrical discharge. The current through a normally nonconductive medium such as air produces a plasma, which may produce visible light. An arc discharge is initiated either by thermionic emission or by field emission. [1]