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Three-prong plugs do not fit into the older, two-prong receptacles. [7] When used as intended, the ground pin of the 3-wire receptacle is to be connected to a grounded cover screw, or to an external ground. In 1969, Underwriters Laboratories mandated three-prong plugs on major appliances for safety. [7]
24 Volt 7-pin trailer connector ISO 1185 (Viewed from back of plug where wires connect to pins) Physical design according to standard ISO 1185. [4] [22] This connector is common on heavy duty commercial trucks and trailers but is replaced by the ISO 12098 connector on newer vehicles. #
On cars and light trucks (listed below as Light Vehicles) there is no formal standard, instead there is an accepted standard. However, you can not be entirely sure until you have measured the current connector on the vehicle and trailer that they fit each other. Heavy Vehicles are standardized through SAE J560 which is similar to ISO 1185.
Plus in newer cars, the power output from the lighter plug is so reliable that it can charge laptops, without any voltage problems. Standardized 12 volt DC automobile plugs are defined in the United States by UL Standard 2089 regarding vehicle battery adapters. This standard covers plugs and cord sets that insert into cigarette lighter receptacles.
The image of the 7 and 12 pin flat plugs are from the cable entry view (and possibly the images of the round connectors too). Please see reference [2] (VSB1 section 14) for front image. Reference [1] Narva wiring diagrams also have the diagrams cable entry view. If you want the front view images in colour see [3]
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An LCDI cord has a fine wire mesh around the conductors, and circuitry to detect current leaking from the conductors to the mesh, which would happen if the cord were damaged or frayed. The plugs are normal NEMA 5-15, 5-20, 6-15, 6-20, or 6-30 plugs, depending on the air conditioner design, and are typically molded-on designs.
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