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2. Knob-and-tube wiring - Wikipedia

   en.wikipedia.org/wiki/Knob-and-tube_wiring

   Ceramic bushings protected each wire entering a metal device box, when such an enclosure was used. Loom, a woven flexible insulating sleeve, was slipped over insulated wire to provide additional protection whenever a wire passed over or under another wire, when a wire entered a metal device enclosure, and in other situations prescribed by code.

3. Pattress - Wikipedia

   en.wikipedia.org/wiki/Pattress

   A pattress or pattress box or fitting box (in the United States and Canada, electrical wall switch box, electrical wall outlet box, electrical ceiling box, switch box, outlet box, electrical box, etc.) is the container for the space behind electrical fittings such as power outlet sockets, light switches, or fixed light fixtures.

4. Plug-in box (stage lighting) - Wikipedia

   en.wikipedia.org/wiki/Plug-in_box_(stage_lighting)

   The electrical components are housed in or on a metal box which can be mounted to a floor, wall, or structure such as a lighting truss. [3] Plug-in boxes often have multiple circuit breakers, and may be supplied power from a dimmer. [4]

5. Junction box - Wikipedia

   en.wikipedia.org/wiki/Junction_box

   A small metal, plastic or fiberglass junction box may form part of an electrical conduit or thermoplastic-sheathed cable (TPS) wiring system in a building. If designed for surface mounting, it is used mostly in ceilings, concrete or concealed behind an access panel—particularly in domestic or commercial buildings [2].

6. Electrical enclosure - Wikipedia

   en.wikipedia.org/wiki/Electrical_enclosure

   Polycarbonate, glass-reinforced, and fiberglass boxes are used where stronger cabinets are required, and may additionally have a gasket to exclude dust and moisture. Metal cabinets may meet the conductivity requirements for electrical safety bonding and shielding of enclosed equipment from electromagnetic interference.

7. Three-prong adaptor - Wikipedia

   en.wikipedia.org/wiki/Three-prong_adaptor

   In 1969, Underwriters Laboratories mandated three-prong plugs on major appliances for safety. [7] At that time, only half of the receptacles in US homes were three-prong. [7] Wiring in most homes did not include a grounding wire. The screws and outlet boxes were either connected to the neutral, or connected to nothing.