Quote:
If there is a hard and fast definition for this then I'd like to see it. I personally - and I may be quite wrong! - see things on the end of a cable as a plug, and something mounted on a chassis or housing as a socket.
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In the army (and presumably followed as a standard in the other services): EMER Workshops F100 Section 123 paragraph 10:
"The insert is moulded to carry the contacts which may be pins, and the jnsert is then termed a PLUG. If the contacts are in tube form the insert is termed a SOCKET. A plug or socket insert may be fitted to either a free or fixed shell."
B40A to B40C receivers were always fitted with 2-pin fixed plugs for the mains supply in Navy service with a separate earth connection. A B40 with a 3-pin plug will have been modified in later life.