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2. Electrical equipment in hazardous areas - Wikipedia

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

   Also known as non-hazardous or ordinary locations, these locations are determined to be neither Class I, Division 1 or Division 2; Zone 0, Zone 1 or Zone 2; or any combination thereof. Such areas include a residence or office where the only risk of a release of explosive or flammable gas would be such things as the propellant in an aerosol spray .

3. Disconnector - Wikipedia

   en.wikipedia.org/wiki/Disconnector

   In electrical engineering, a disconnector, disconnect switch or isolator switch is a type of switching device with visible contacts, used to ensure that an electrical circuit is completely de-energized for service or maintenance.

4. NEMA enclosure types - Wikipedia

   en.wikipedia.org/wiki/NEMA_enclosure_types

   Certified and labelled for use in areas with specific hazardous conditions: for indoor and outdoor use in locations classified as Class II, Groups E, F, or G as defined in NFPA standards such as the NEC. 10: MSHA. Meets the requirements of the Mine Safety and Health Administration, 30 CFR Part 18 (1978). 11: General-purpose.

5. Appliance classes - Wikipedia

   en.wikipedia.org/wiki/Appliance_classes

   Although there should be no risk of receiving an electrical shock from Class III appliances, other electrical hazards (such as overheating and fire) must still be considered. For instance, a laptop or mobile phone might qualify as a Class III appliance if it is charged via an external SELV adapter, even though the onboard battery could pose a ...

6. Switchgear - Wikipedia

   en.wikipedia.org/wiki/Switchgear

   High-voltage switchgear was invented at the end of the 19th century for operating motors and other electric machines. [1] The technology has been improved over time and can now be used with voltages up to 1,100 kV. [2] Typically, switchgear in substations is located on both the high- and low-voltage sides of large power transformers. The ...

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