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Wire sized 1 AWG is referred to as "one gauge" or "No. 1" wire; similarly, thinner sizes are pronounced "x gauge" or "No. x" wire, where x is the positive-integer AWG number. Consecutive AWG wire sizes thicker than No. 1 wire are designated by the number of zeros: No. 0, often written 1/0 and referred to as "one aught" wire
If the size is not known, it is difficult to distinguish by eye or measurement between the 2.1mm and 2.5mm ID plugs; some suppliers suggest simple methods. [1] Maximum current ratings commonly vary from unspecified up to 5 A (11 A for unique high-power versions from some companies [2]), with 1 A, 2 A, and 5 A being common values. [3]
The physical design is also used by SAE J560 with basically the same configuration. The difference is that SAE J560 uses 12V (larger wire cross-section and higher amp rating on fuses). Pin 7 may also have a different behavior on SAE J560. [23] [24] [25]
12-volt cigarette lighter receptacle and plug, size A. Receptacle inside diameter: 20.93–21.01 mm (median 20.97 mm) Plug body diameter: 20.73–20.88 mm (median 20.805 mm) Most often used in American automobiles; 12-volt cigarette lighter receptacle and plug, size B. Receptacle inside diameter: 21.41–21.51 mm (median 21.455 mm)
It was replaced by a minor revision called 12V-2x6, which changed the connector to ensure that the sense pins only make contact if the power pins are seated properly. The original connector was formally adopted as part of PCI Express 5.x, [ 1 ] while the revised 12V-2x6 connector design was adopted later.
A lower rating will apply if multiple conductors are in proximity, since each contributes heat to the others and diminishes the amount of external cooling of the conductors. Depending on the type of insulating material, common maximum allowable temperatures at the surface of the conductor are 60, 75, and 90 °C, often with an ambient air ...
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