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In older plug designs both blades were the same width, so the plug could be inserted into the receptacle either way around. Many plugs manufactured since 1948 are polarized; the neutral blade is 5 ⁄ 16 in or 7.9 mm wide, 1 ⁄ 16 in or 1.6 mm wider than the line blade, so the plug can be inserted only one way. Polarized 1-15P plugs will not ...
At the same time Lundberg were offering the 2.5 A Dot, 5 A Universal, and 15 A Magnum, and Tucker were offering a range of 5 A, 10 A and 20 A plugs and sockets. [27] BS 73 Wall plugs and sockets (five ampere two-pin without earthing connection) was first published in 1915, and revised in 1919 with the addition of 15 A and 30 A sizes. By the ...
As early as 1885 a two-pin plug and wall socket format was available on the British market. By about 1910 the first three-pin earthed (grounded) plugs appeared. Over time other safety improvements were gradually introduced to the market. The earliest national standard for plugs and wall sockets was enacted in 1915 in the UK. [citation needed]
Crimped plug-and-socket connectors can be classified as rear release or front release. This relates to the side of the connector where the pins are anchored: [20] Front release contacts are released from the front (contact side) of the connector, and removed from the rear. The removal tool engages with the front portion of the contact and ...
Compared to modern electrical wiring standards, these are the main technical shortcomings of knob-and-tube wiring methods: never included a safety grounding conductor did not confine switching to the hot conductor (the so-called Carter system prohibited as of 1923 places electrical loads across the common terminals of a three-way switch pair)
This plug-and-socket system is equivalent to the IEC "Plug Type D" system. [23] SANS 164-4: Dedicated System, 16 A 250 V [24] [25] These plugs and sockets, unique to South Africa, [2] are similar to the SANS 164-1 connectors, but have the earth pin flattened on one side to prevent conventional plugs from being inserted into dedicated sockets ...
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