2. Never 'daisy-chain' extension leads. Appliances are designed not to draw more power than their plug is rated for; the use of such adaptors, and also multi-socketed extension leads, makes it possible for several appliances to be connected through a single outlet, with the potential to cause dangerous overloads. Electric devices using power cables that connect to wall outlets using only two prongs instead of three are designed with a floating ground. The prevalence of battery-powered quartz-controlled wall clocks has meant that this connector is rarely seen in new installations for clock use. ASTA AS158. SlimPlug is available only as part of a complete power lead terminating in an IEC 60320 C7 unpolarized (figure-of-eight) connector. However, it has found use where a low profile fused connector is required and is still available. Charging an EV is deemed as 'use' or using the vehicle, much like you are using a car if you are refuelling it with petrol, even if you aren't physically driving it. Much like "ribbon cable," its signature shape has earned names like "flat cable" and "multi-planar cable." The purpose of this arrangement is to maximize the potential number of wires while minimizing the footprint, which allows for many wires to fit in tight spaces.

For example, small wiring that can handle low-voltage applications like landscape lighting isn't qualified to carry the load required for a water heater. They are also used in other situations where a fuse or switch (or both) is required, such as when feeding lighting off a socket-outlet circuit, to protect spurs off a ring circuit with more than one socket-outlet, and sometimes to switch feeds to otherwise concealed sockets for kitchen appliances. BS 1363 type plugs (to a recognized standard) to BS 1363 sockets. The Plugs and Sockets, etc. (Safety) Regulations 1994 permit domestic appliances fitted with non-BS 1363 plugs to be supplied in the UK with conversion plugs fitted, but not with conversion plugs supplied for fitting by the consumer. The UK Electrical Safety Council has drawn attention to the fire risk associated with forcing Europlugs into BS 1363 sockets. BS 8546 applies to travel adaptors having at least one plug or socket-outlet portion compatible with BS 1363 plugs and socket-outlets. BS 8546 travel adaptors may also include USB charging ports.

Depending on purpose and age, these circuits may utilize open-wire conductors, twisted-pair cables (similar to telephone networks), coaxial cables (similar to CATV networks), or fiber optic cables. Alternatively, shutters may be opened by simultaneous insertion of line and neutral pins. BS 1363 sockets must have shutters on the line and neutral contacts to prevent the insertion of a foreign object into the socket. Such covers are also sometimes sold in the UK, but the shutters of the BS 1363 socket-outlet make these unnecessary. In 2016 the use of socket covers was banned in premises controlled by the National Health Service (NHS) in the United Kingdom. In countries using un-shuttered socket-outlets, socket covers are sometimes sold to prevent children inserting objects into otherwise unprotected sockets. Made by Dorman & Smith (using patents applied for in 1943) the plugs and sockets were rated at 13 A and were one of the competing types for use on ring final circuits. The variants use a flattened earth pin, each at a different specified rotational position. Early types were available fused in both poles; later types fused in the line only and provided an earth pin. The Wylex plugs were initially made in three ratings, 5 A, 10 A and 15 A and were unpolarized (the current-carrying pins were on the same centre line as the earth pin).

In 1933 an asymmetric polarized version was introduced, with line pin slightly offset from the centre line. A household plug and socket is defined in SANS 164-1, and is essentially a modernised version of the BS 546 15 A (the essential differences are that pins can be hollowed to reduce the amount of metal used, the dimensions are metricated, and it is rated 16 A). In 1934 the dual plug system was introduced with the socket rated at 15 A and three sizes of plug, fused 2 A and 5 A plugs and a 15 A plug. Some later designs require all three pins to be inserted simultaneously. The non-BS 1363 plug is inserted into the contacts, and the hinged body of the conversion plug is closed and fixed shut to grip the plug. Adaptors which allow the use of non-BS 1363 plugs, or more than two BS 1363 plugs, must be fused.

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