(wiring)
121AC power plugs and sockets — See also: Industrial and multiphase power plugs and sockets Plugs and sockets may sometimes combine male and female contacts, but t …
122Electrical conduit — risers, seen inside fire resistance rated shaft, as seen entering bottom of a firestop. The firestop is made of firestop mortar on top, rockwool on the bottom. Raceways are used to protect cables from damage …
123Cryptanalysis of the Enigma — enabled the western Allies in World War II to read substantial amounts of secret Morse coded radio communications of the Axis powers that had been enciphered using Enigma machines. This yielded military intelligence which, along with that from… …
124Enigma machine — Military Enigma machine …
125Network interface device — In telecommunications, a Network Interface Device (NID) is a device that serves as the demarcation point between the carrier s local loop and the customer s premises wiring. Generically, an NID may also be called a Network Interface Unit (NIU),… …
126Demarcation point — Dmark redirects here. For the German currency, see Deutsche Mark. Old and new style demarcation points in a Canadian home built in 1945. A splitter for a DSL modem has been plugged into the modern demarc (on the right). One line passes through a… …
127Ground and neutral — For uses of the term ground or earth in electricity but not in the context of mains wiring, see ground (electricity). Since the neutral point of an electrical supply system is often connected to earth ground, ground and neutral are closely… …
128Aluminum wire — is a type of wiring used in houses and power grids. History Usage within utilities Since the early 1900s, utility companies have been using aluminum wire for transmission of electricity within their power grids. It has advantages over the older… …
