How to Understand Electricity: Volts, Amps and Watts Explained on Appl…
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Each has the same general appearance but they are different physical sizes to prevent interchangeability, they use pin spacing which is also different from the two pin plugs specified in BS 372, so earthed plugs will not fit into unearthed sockets, and vice versa. The pin configuration of the Tripin appears virtually identical to modern BS 546 plugs. A fused 13 A version of this continued to be available after the introduction of BS 1363, illustrating that BS 546 was not used exclusively at any time. The Midget Gauge was rated at 3 A, the Standard Gauge rated at 5 A, and the Union Gauge rated at 10 A. Also offered were two-way and three-way "T pieces" or multi-way adaptors for the 3 A and 5 A plugs, two-way only for the 10 A. Versions of the concentric plug and socket were now offered rated at 5 A and 10 A. At the same time Lundberg were offering the 2.5 A Dot, 5 A Universal, and 15 A Magnum, and Tucker were offering a range of 5 A, 10 A and 20 A plugs and sockets. The standard specifies breaking time versus current characteristics only for 3 A or 13 A fuses.
If the equipment is using the full 7kW, then divide 7000 by the voltage to get the current. In 1941 Lord Reith, then the minister of Works and Planning, established committees to investigate problems likely to affect the post-war rebuilding of Britain. BS 1363 was introduced in 1947 as one of the new standards for electrical wiring in the United Kingdom used for post-war reconstruction. In an appendix to the main report (July 1944), the committee proposed that a completely new socket-outlet with a fuse in the plug to protect an appliance's flexible cord should be adopted as the "all-purpose" one socket and plug domestic standard. 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. However, it may also be possible to force the Euro plug into British sockets.
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)". Generators in power stations output a relatively low voltage, typically 10,000 volts. 1957: Complementary standard published, BS 2814:1957 "Two-pole and earthing-pin flush-mounted 13-Amp switch socket-outlets for A.C. circuits up to 250 Volts". BS 8546 applies to travel adaptors having at least one plug or socket-outlet portion compatible with BS 1363 plugs and socket-outlets. 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. It provides for an overall rating of 250 V AC, minimum current rating of 5 A, and a maximum of 13 A. Adaptors with BS 1363 plug pins must incorporate a BS 1362 fuse.
Shaver supply units must also be current-limited; BS EN 61558-2-5 specifies a minimum rating of 20 VA and maximum of 50 VA. 100 amps. This is the absolute minimum current. This stands for "alternating current" and means that the current "alternates" or changes direction. As electricity became a common method of operating labour-saving appliances, a safe means of connection to the electric system other than using a light socket was needed. In the UK it was used for moderate sized appliances, either on its own 5 A circuit or on a multi socket 15 A circuit, and also on many adaptors (both multi socket 5 A adaptors and adaptors that also had 15 A pins). In electronic circuits and some electrical appliances, components called resistors have precise values of resistance so that they can be used to control the value of current flowing in a circuit. The metric values are conversions provided here for convenience. A current as low as 30mA can cause ventricular fibrillation, so RCDs (residual current devices) that detect earth leakage faults are designed to trip and shut off power when a current of 30 mA flows (e.g. if you touch a power cable). Some of these are legal in the country they are manufactured in, but do not meet BS 1363 - these can be brought into the UK by unsuspecting travellers, or people purchasing electrical goods online.
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