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The first types of small modular telephone connectors were created by AT&T in the mid-1960s for the plug-in handset and line cords of the Trimline telephone. [1] Driven by demand for multiple sets in residences with various lengths of cords, the Bell System introduced customer-connectable part kits and telephones, sold through PhoneCenter stores in the early 1970s. [2]
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Electrical wiring is an electrical installation of cabling and associated devices such as switches, distribution boards, sockets, and light fittings in a structure. Wiring is subject to safety standards for design and installation.
[1]: 112 They are needed to allow appliances with 3-wire power cords to plug into legacy ungrounded (two slot) receptacles found in older buildings. The use of such an adapter avoids the need to replace receptacles, but is potentially hazardous if the grounding tab is not connected to electrical ground.
An SMPS designed for AC input can usually be run from a DC supply, because the DC would pass through the rectifier unchanged. [35] If the power supply is designed for 115 VAC and has no voltage selector switch, the required DC voltage would be 163 VDC (115 × √2). This type of use may be harmful to the rectifier stage, however, as it will ...
McNamara opened the 2023 season as Iowa’s starting quarterback but suffered a season-ending ACL tear five games into the season. He recovered in time to be Iowa’s Week 1 starter again but ...
(The Center Square) — New York will usher in a host of new laws in 2025 that will expand paid leave and worker's compensation benefits, reduce the cost of insulin for diabetes patients and make ...
Two Holland America cruise ships hit by norovirus. The most recent outbreak was on Holland America's Rotterdam ship, which set sail on Dec. 8 and is set to end its Caribbean