Type D is used almost exclusively in India and Nepal. India has standardized on a plug which was originally defined in British Standard 546 (the standard in Great Britain before 1947). This 5 amp plug has three round prongs that form a triangle. The central earth pin is 20.6 mm long and has a diameter of 7.1 mm. The 5.1 mm line and neutral pins are 14.9 mm long, on centres spaced 19.1 mm apart. The centre-to-centre distance between the grounding pin and the middle of the imaginary line connecting the two power pins is 22.2 mm. Type M, which has larger pins and is rated at 15 amps, is used alongside type D for larger appliances in India, Sri Lanka, Nepal and Pakistan. Some sockets can take both type M and type D plugs.
Although type D is now almost exclusively used in India and Nepal, it can still occasionally be found in hotels in the UK. It should be noted that tourists should not attempt to connect anything to a BS 546 round-pin outlet found in the UK as it is likely to be on a circuit that has a special purpose: e.g. for providing direct current (DC) or for plugging in lamps that are controlled by a light switch or a dimmer.
Type D plugs are among the most dangerous ones in the world: the prongs are not insulated (i.e. the pin shanks do not have a black covering towards the plug body like type C, G, I, L or N plugs), which means that if a type D plug is pulled halfway out, its prongs are still connected to the socket! Little children run the risk of electrocuting themselves when pulling such a plug out and putting their fingers around it. Type D outlets are not recessed into the wall, so they do not provide any protection from touching the live pins either.
Reference: WorldStandards
Be sure to ground yourself and your vehicle properly when using this RV power adapter. Be careful when using an extension cord. If you’re not sure if it’s far away from the wall outlet, it’s best not to use it. https://rvprofy.com/how-to-bend-rv-corner-trim/
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