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2. Electrical equipment in hazardous areas - Wikipedia

   en.wikipedia.org/wiki/Electrical_equipment_in...

   A light switch may cause a small, harmless spark when switched on or off. In an ordinary household this is of no concern, but if a flammable atmosphere is present, the arc might start an explosion. In many industrial, commercial, and scientific settings, the presence of such an atmosphere is a common, or at least commonly possible, occurrence.

3. Explosion protection - Wikipedia

   en.wikipedia.org/wiki/Explosion_protection

   Avoidance makes it impossible for an explosion or deflagration to occur, for instance by means of suppressing the heat and the pressure needed for an explosion using an aluminum mesh structure such as eXess, by means of consistent displacement of the O 2 necessary for an explosion or deflagration to take place, by means of padding gas (f. i. CO 2 or N 2), or, by means of keeping the ...

4. Valve actuator - Wikipedia

   en.wikipedia.org/wiki/Valve_actuator

   This can be achieved by a flameproof enclosure, where the housing is designed to prevent ignition sparks from leaving the housing even if there is an explosion inside. Actuators designed for these applications, being explosion-proof devices, have to be qualified by a test authority (notified body). Explosion protection is not standardized ...

5. Intrinsic safety - Wikipedia

   en.wikipedia.org/wiki/Intrinsic_safety

   Intrinsic safety (denoted by "i" in the ATEX and IECEx Explosion Classifications) is one of several available methods for electrical equipment. see Types of protection for more info. For handheld electronics, intrinsic safety is the only realistic method that allows a functional device to be explosion protected.

6. ATEX directives - Wikipedia

   en.wikipedia.org/wiki/ATEX_directives

   "Effective ignition source" is a term defined in the European ATEX directive as an event that, in combination with sufficient oxygen and fuel, can cause an explosion. Methane, hydrogen, and coal dust are good examples of possible fuels. [3] Effective ignition sources are: [4] Lightning strikes; Stray currents; Static electricity

7. IUD Insertion Pain Is Borderline Unbearable. This New Tool ...

   www.aol.com/doctors-still-ancient-tools-iud...

   Soon, with five people in the room—Townsell, her boyfriend, a patient-care advocate, the supervising doctor, and a doctor in training—the doctor used the Carevix to place her copper IUD.