Theoretically, such protection could have been designated either within the socket or within the plug. Plugs and sockets were usually of an industrial waterproof design with a screw locking ring on the plug to hold it in the socket against waterproof seals, what are electric cables and sockets often had a screw cap chained to them to be used when no plug was inserted to keep them waterproof. If the service engine light comes on and you think, "Huh, I did just get gas. Maybe I'll check that before I continue with my panic attack," and screw the cap on yourself, the light will go off without the assistance of a diagnostic tool to clear the code. Driving with your emergency brake engaged can also cause damage to the emergency brake cable and the service brakes. There's also a new type of service being developed that will take broadband into the air. The AWG is a large, hollow cylinder filled with air and anchored to the seafloor at varying depths. The pipe opens, allowing air to decompress. Other exceptions to the use of BS 1363 plugs and sockets include equipment requiring more than 13 A, low-power portable equipment (such as shavers and toothbrushes) and mains-operated clocks.

Wired connections may also be connected to the final ring, requiring to include a suitably rated fuse and switch. However, to ensure that this protection has a rating matched to the appliance flexible cord fitted to the plug, a fuse rated between 1A and 13A is incorporated into each plug. This new standard covers adaptors for use with BS 1363 socket-outlets and includes conversion adaptors (those which accept plugs of a different type), multiway adaptors (those which accept more than one plug, which may or may not be of a different type) and shaver adaptors. BS 1363 is a British Standard which specifies the common single-phase AC power plugs and sockets that are used in the United Kingdom. BS 1363 replaced the BS 546 plug and socket (which are still found in old installations or in special applications such as remotely switched lighting). Use of the BS 546 30 A plugs and sockets diminished through the 1970s as they were replaced with BS 4343 (which later became IEC 60309) industrial combo plugs and sockets. BS 1363:1984 and earlier versions dealt only with 13 A plugs and sockets. August 1984: BS 1363:1984 "Specification for 13 A fused plugs switched and unswitched socket-outlets" published.

September 1995: BS 1363-2:1995 "13 A plugs socket-outlets adaptors and connection units - Part 2: Specification for 13 A switched and unswitched socket-outlets" published. Since the fuse or circuit breaker for a final ring circuit has to be rated for the maximum current the final ring could carry (30A or 32A for a breaker), additional protection is required at each socket-plug connection. Distinctive characteristics of the system are shutters on the line and neutral socket holes, and a fuse in the plug. The larger top pin is the earth connection, the left-hand pin is neutral and the right-hand pin is line when looking at a socket or at the rear of a plug. The technique is called redirected walking -- the system tricks the user into walking in a curved path, but the user believes he is following a straight line. One of the other recommendations in the report was the introduction of the final ring circuit system (often informally called a "ring main"). In the final ring circuit, each socket-outlet was supplied with current by conductors on both sides of the 'loop.' This contrasts with the radial circuit system (which is also used in the UK, often in the same installation) wherein a single cable runs out radially, like a spoke, from the distribution board to serve a number of sockets.

A social security number is just a number used to track social security benefits, but it is used as a form of identification in almost every situation. In this arrangement a cable connected to a fuse, or circuit breaker, in the distribution board was wired in sequence to a number of sockets before being terminated back at the distribution board, thus forming a final ring circuit. The first of these was stated as, "To ensure the safety of young children it is of considerable importance that the contacts of the socket-outlet should be protected by shutters or other like means, or by the inherent design of the socket-outlet." Others included flush-fitting as opposed to the 2A, 5A and 15A sockets which mainly protruded from the wall being fitted on a patress, a switch being optional, requirements for terminals, bottom entry for the cable, and contact design. However, the BS 1363 system is not limited to use with final ring circuits being suitable for radial circuits. May 1950: BS 1363:1947 Amendment 3, title changed to "Specification for two-pole and earthing-pin fused-plugs and shuttered socket-outlets for A.C. circuits up to 250 Volts (not intended for use on D.C. circuits)".