It has been adopted in many former British colonies and protectorates. Distinctive characteristics of the system are shutters on the neutral and line (see § Concepts and terminology below) socket holes, and a fuse in the plug. It is often associated with obsolete wiring installations or where it is found in modern wiring, it is confined to special use cases, particularly for switch controlled lamps and stage lighting.īS 1363, 13 A plugs socket-outlets adaptors and connection units is a British Standard which specifies the most common type of single-phase AC power plugs and sockets that are used in the United Kingdom. In the United Kingdom and in Ireland this system is usually referred to by its pin shape and is simply known as "round pin plugs" or "round pin sockets". BS 546 plugs and sockets are still permitted in the UK, provided the socket has shutters. The 5 A version has been designated as Type D and the 15 A as Type M in the IEC 60083 plugs and sockets standard.
BS 546 is also the precursor of current Indian and South African plug standards. Originally published in April 1934, it was updated by a 1950 edition which is still current, with eight amendments up to 1999. British standards have proliferated throughout large parts of the former British Empire.īS 546, Two-pole and earthing-pin plugs, socket-outlets and socket-outlet adaptors for AC (50–60 Hz) circuits up to 250 V is a British Standard for three-pin AC power plugs and sockets. These were usually sold as a mating pair, but gradually de facto and then official standards arose to enable the interchange of compatible devices. Of course, truck stops have even bigger nozzles for diesel to go in big rigs and other sizable vehicles.Plugs and sockets for electrical appliances not hardwired to mains electricity originated in the United Kingdom in the 1870s and were initially two-pin designs. Gasoline ruins diesel fuel systems rather quickly, and it's not too hard to be distracted and misfuel. I imagine that station eventually figured it out and put a leaded fuel sized nozzle as I think other manufacturers rolled out similar contraptions too. So I stopped filling up there, because the contraption was designed to never come out and it takes a long time to fill up when the contraption opposes your nozzle because it's too small.
With that contraption, I found one of my usual stations was using an unleaded sized nozzle for diesel. So, I had a 2011 VW Diesel, and before the emissions scandal, they had some fuel issues that they were blaming on gasoline in the fuel system, and so they sent out stickers to the registered owners to put around the filler that said 'hey - diesel only', and that didn't solve the issue, so they sent a contraption that made it hard to fill with an unleaded sized nozzle. Since they the larger filler, it was no big deal to put an unleaded size nozzle on a diesel pump - it still fits in the car, and it's got a green cover, the international sign of not default fuel. Diesel kept the larger size fillers, because all the existing pumps used them. But cars built for leaded gas had a larger opening and could take either nozzle. When they came up with unleaded gasoline, they used a new, smaller nozzle, so that unleaded only cars could have fillers that only let the smaller nozzle fit to exclude leaded gas. When all gasoline was leaded, diesel (for cars) and gasoline used the same size nozzles.
Diesel pumps in the US aren't really standardized, or at least they didn't use to be.
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