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        Q: What are the disadvantages of a 3 pin plug?
A: A three pin socket is greater to a two pin socket since it protection the u.s.er from receiving electric shocks.The larger pin is the earth connector which does the tasks of protection the u.s.er . 

Q: 2003 Nissan Pathfinder that idles too high at 950 RPM since I installed spark plugs, cleaned throttle body?
A: Removing forwarde spark plug , snap the plug wire back in and ground the threads on a metal part of the engine whilst somebody spins the motor over with the beginninger . If you ca n't see any spark , you have a coil or electronic ignition problem inside the distributor . Older Nissan resellers 're noted for failed . 

Q: U have a socket...for three pin plug...top one is for earthing...sae left one?
A: I believe it is a result of safety reason . The earth pin will be linked to the earth pin receptor in the socket , making the appliance safe for utilized as it 's already ground even before the life wire ( L and N ) were linked to the main socket . Liz . I believe it is a result of safety reason . The earth pin will be linked to the earth pin receptor in the socket , making the appliance safe for utilized as it 's already ground even before the line wire ( L and N ) were linked to the main socket . Liz . First rather than saying longer you ought to be specifically applicable to say that it is LARGER . ( length as well as crossing section 's more ) More the thickness of the wire/conductor , less is the resistance . A thick earth pin is providing a less resilient path for the current to be ground . this situation is for security so the leakageage current if any will take the less resilient road to earth pin to ground instead of a person operating an appliance . As you use the word , 'earth ' ( instead of 'ground ' ) , you 're likely alluded to a British plug (