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Unlike the original, the plug has insulated sleeves on the pins. These include plugs with insulated sleeves, sockets with blocking shutters, and sockets designed to accept only compatible plugs inserted in the correct orientation. There were concerns that consumer safety was compromised by the substantial quantity of counterfeit and unsafe electrical plugs and sockets being placed on the UK market and also by the provision of electrical equipment without an appropriate means to connect it to the mains supply in the consumer's home. BS 546 plugs and sockets are still permitted in the UK, provided the socket has shutters. By the time the 1911 GEC Catalogue was published two-pin plugs and sockets were being offered with specifications in amps, but still with no indication as to pin size or spacing. It is sometimes still used to connect lamps to a lighting circuit. Multiple 5 A sockets might be on a 15 A circuit, or each on a dedicated 5 A 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.

Correct polarity is established by the position of the earth pin relative to the other two pins, ensuring that the line pin is connected to the correct terminal in the socket-outlet. BS 546, Two-pole and earthing-pin plugs, socket-outlets and socket-outlet adaptors for AC (50-60 Hz) circuits up to 250 V is an older British Standard for three-pin AC power plugs and sockets. Prior to the first British Standard for earthed plugs, George H. Scholes of Manchester introduced plugs with a hollow round earth pin between rectangular current-carrying pins in 1926 under the Wylex brand name. The pins of both round pin and rectangular pin plugs are arranged in a triangular fashion, the earth pin being the larger and longer pin at the apex. The first British standard for domestic three-pin plugs was BS 317 Hand-Shield and Side Entry Pattern Three-Pin Wall Plugs and Sockets (Two Pin and Earth Type) published in 1928. This was superseded in 1930 by BS 372 Side-Entry Wall Plugs and Sockets for Domestic Purposes Part II which states that there are only minor alterations from BS 317. In 1934, BS 372 Part II was in turn superseded by the first edition of BS 546 Two-Pole and Earthing-Pin Plugs and Socket Outlets.

This requirement for a new system of plugs and sockets led to the publishing in 1947 of "British Standard 1363:1947 Fused-Plugs and Shuttered Socket-Outlets". Despite this CE marking is sometimes fraudulently used, especially on universal sockets. There are certain characteristics common to British mains plugs and sockets intended for domestic use. These are termed neutral, line and earth. Neutral is usually at or very near to earth potential, being earthed either at the substation or at the service entrance (neutral-to-earth bonding is not permitted in the distribution board/consumer unit). Historically, two-pin sockets without earth were used in Britain, but their use is now restricted to sockets specifically designated for shavers and toothbrushes. The final ring circuit in the UK requires the use of BS 1363 plugs and sockets. Museum of Plugs and Sockets. 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 was introduced in 1947 as one of the new standards for electrical wiring in the United Kingdom used for post-war reconstruction. It is often associated with obsolete wiring installations or where it is found in modern wiring, it is confined to special use cases, particularly for switch-controlled lamps and stage lighting. When installed in wet areas (e.g. bathrooms), for safety reasons it is normally found incorporated into a shaver supply unit which includes an isolation transformer and meets various mechanical and electrical characteristics specified by the BS EN 61558-2-5 safety standard to protect against shock in wet areas. 1994, to require plugs sold to meet the technical standard. Plugs fitted with BS 546 fuses have been optional since the original BS 546:1934 with maximum fuse ratings of 2 A in the 2 A plug, and 5 A in the 5 A, 15 A and 30 A plugs. 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. Instead of calling the device a television, however, Nipkow called it an "electric telescope". For those who are looking at alternatives to charging at the home addresses or want to use a dedicated public device nearby, Zap Map's website and app locates over 20,000 public charge points EV owners have access to - even telling drivers if the device is in use or faulty.

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