What are the Pulleys For? > 고객센터

Prestressed concrete poles are often used in coastal areas subject to atmospheric corrosion (one manufacturer claims that "concrete poles are foremost in appearance, durability and maintenance-free service"). Cabins come in a variety of shapes and sizes depending upon the system and cable car manufacturer. Pulsed (PUL) systems are fixed grip gondola systems that circulate one or more trains or "pulses" of cabins. Funitels are known to use the most energy of all cable car systems and due to their dual loop configuration (which provide both support and propulsion) have higher maintenance costs. 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. January 1957: BS 1363:1947 Amendment 5, added clause permitting operation of shutters by simultaneous insertion of two or more pins (in addition to original method using only earth pin). These were clearly recognisable as two-pin plugs and sockets, but with no indication as to pin size or spacing, they were sold as pairs. By the 1927 revision of BS 73 four sizes of two-pin plugs and sockets were standardized: 2 A, 5 A, 15 A and 30 A. This was later superseded by BS 372:1930 part 1 Two-pin Side-entry Wall Plugs And Sockets for Domestic Purposes.

Although still permitted by the UK wiring regulations, BS 546 sockets are no longer used for general purposes. 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 This was superseded in 1930 by BS 372 Side-Entry Wall Plugs and Sockets for Domestic Purposes Part II which states that there are only minor alterations from BS 317. In 1934, BS 372 Part II was in turn superseded by the first edition of BS 546 Two-Pole and Earthing-Pin Plugs and Socket Outlets. 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.

The main intention to design this cable is to transmit analog and digital signals to the computer system. The main report listed eight points to consider in deciding the design of the new standard. The appendix added five further "points of technical detail" including requirements that plugs could not be inserted incorrectly, should be easy to withdraw, and should include a fuse. 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. A plug is defined in IEC 60050 as an "accessory having pins designed to engage with the contacts of a socket-outlet, also incorporating means for the electrical connection and mechanical retention of flexible cables or cords". Councils recommend that charging cables should only be across the footpath when the vehicle is plugged in.

For drivers with street parking only, there is something called the On-Street Residential Charging Scheme (ORCS), which allows owners of plug-in cars to write to their council to ask for them to install local charging devices. Those with off-street parking can access the Electric Vehicle Home-Charge Scheme (EVHS), which is a government grant that provides a 75 per cent contribution to the cost of one chargepoint and its installation. A grounded shield on cables operating at 2.5 kV or more gathers leakage current and capacitive current, protecting people from electric shock and equalizing stress on the cable insulation. In the early 20th century, A. P. Lundberg & Sons of London manufactured the Tripin earthed plug available in 2.5 A and 5 A models. Figure 2: A 3rd rail collector shoe on a suburban EMU in London. In BS 546 there are no dimensions for socket contacts, what is electric cable instead they are required to make good contact with the specified plug pins. 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.