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Fuses for high-voltage equipment, up to 115,000 volts, are rated by the total apparent power (megavolt-amperes, MVA) of the fault level on the circuit. In the US in 1880, the total length of canals was around 7,200 kilometres (4,500 miles). One exception was a short and partial service on the Erie canal in Ohio in 1900, over a distance of 67 kilometres (42 miles). It consisted of an unmanned electric mule, operated from the barge, riding on a rigid rail or rack, or suspended in the air on a cable, parallel to the canal - either on the banks or over the water. AEP built the first high-voltage transmission line, between Muncie and Marion in Indiana in 1911, the first long-distance line, transmitting electricity from a coal mine mouth plant, and the first commercial nuclear power plant on Lake Michigan, at the two-unit Donald Cook station, in the early 1970s. The wheeling of power, which is the transfer of electricity from one supplier over the transmission lines of another system, to where it was needed by a third customer, was used by regulated utilities to increase the reliability of regional grids, in case of an unscheduled shutdown of large generating units, such as from storms or other acts of nature.

Fuses for low voltage power circuits may have bolted blade or tag terminals which are secured by screws to a fuseholder. Ceramic fuses have the advantage of a higher breaking capacity, facilitating their use in circuits with higher current and voltage. While glass fuses have the advantage of a fuse element visible for inspection purposes, they have a low breaking capacity (interrupting rating), which generally restricts them to applications of 15 A or less at 250 VAC. High rupture capacity fuses may be rated to interrupt current of 120 kA. Low-voltage high rupture capacity (HRC) fuses are used in the area of main distribution boards in low-voltage networks where there is a high prospective short circuit current. For example, fuse holders for North American class RK fuses have a pin that prevents installation of similar-appearing class H fuses, which have a much lower breaking capacity and a solid blade terminal that lacks the slot of the RK type. Time-current characteristic; i.e. fuse speed. For example, a glass tube fuse rated at 32 volts would not reliably interrupt current from a voltage source of 120 or 230 V. If a 32 V fuse attempts to interrupt the 120 or 230 V source, an arc may result.

Plasma inside the glass tube may continue to conduct current until the current diminishes to the point where the plasma becomes a non-conducting gas. Miniature fuses may have an interrupting rating only 10 times their rated current. The voltage rating of the fuse must be equal to or, greater than, what would become the open-circuit voltage. The exact fusing current is not as well controlled as an enclosed fuse, and it is extremely important to use the correct diameter and material when replacing the fuse wire, and for these reasons these fuses are slowly falling from favour. The idea was to use cheap electricity generated by the Niagara waterfalls, but eventually nothing happened. Blade type fuses often require the use of a special purpose extractor tool to remove them from the fuse holder. This is their preferred outcome, and you will be told to use your non-functioning phone to call an electrician.

Ambient temperature will change a fuse's operational parameters. Once current is applied, resistance and voltage drop of a fuse will constantly grow with the rise of its operating temperature until the fuse finally reaches thermal equilibrium. Semi-enclosed fuses are fuse wire carriers in which the fusible wire itself can be replaced. High-voltage fuses of the expulsion type have fiber or glass-reinforced plastic tubes and an open end, and can have the fuse element replaced. Connecting fuses in series does not increase the rated voltage of the combination, nor of any one fuse. BS 8546 applies to travel adaptors having at least one plug or socket-outlet portion compatible with BS 1363 plugs and socket-outlets. This is one of the differences you will find if you look in other countries: because of exact details of the electrical design of the exchange and the phones, and where different components are placed, some countries such as the UK require slightly more complex household wiring than just putting all jacks in parallel. Fuses for small, low-voltage, usually residential, wiring systems are commonly rated, in North American practice, to interrupt 10,000 amperes. For example, bottle style fuses distinguish between ratings with different cap diameters.

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