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The designation of a size consists of a Roman numeral. Higher-voltage types rated up to V have increased clearance distances and are longer than lower-voltage-rated fuses, they are available with interrupting ratings up to 50kA RMS, are intended for use as incoming main protection from an electrical supply utility. D0-type fuses have a smaller, cylindrical body, they are available in three different sizes with ratings from 2 A up to A.

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Fuseholders may be secured by screws to a panel, attached to bus bars, or mounted on DIN rails. For the Neozed fuses, there are fuse bases with integrated disconnecting switches. Changing fuses with the circuit off increases the safety of the user. With new versions of these load disconnecting switches, the fuse cartridges are no longer screwed, but are held by spring clips.

Traditional diazed fuse holders are made as a conducting metal envelope covered with non-conducting porcelain cover. Under mechanical stress it is possible for the cover to crack or uncovering the conducting element, it may happen if a fuse holder was accidentally dropped or someone was using too much force to screw it in. Uncovered metal envelopes present a serious risk of shock and should be replaced under extreme precautions by trained personnel; the smaller end cap has a diameter that varies with the fuse rating: higher ratings have wider end caps.

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The fixed part of the fuse holder contains a gauge ring, which will accept end caps up to a certain diameter, it is therefore not possible to fit a fuse of a higher rating than allowed for by the gauge ring. The size of the gauge ring is determined by the current rating of the circuit to be protected. Gauge rings are intended to be changed only by authorized personnel; the larger end cap has at its centre a small spring-loaded button retained by a thin wire, which serves as a " fuse blown" indicator.

When the fuse blows, the wire breaks and the indicator button is ejected by the spring. A missing or displaced indicator thus pinpoints a blown fuse; the removable part of the fuse holder has a small window to allow inspection of the indicator without removal of the fuse. The indicator button has a coloured dot indicating the fuse rating.

D- and D0-type fuses are. IEC IEC is an international standard from the International Electrotechnical Commission for "plugs, socket-outlets and couplers for industrial purposes". There is a range of plugs and sockets of different sizes with differing numbers of pins, depending on the current supplied and number of phases accommodated; the fittings are popular in open-air conditions. They are sometimes used in situations where their special capabilities are not needed, to discourage potential users from connecting domestic appliances to the sockets, as'normal' domestic plugs will not fit; the cable connectors and sockets are keyed and colour-coded, according to the voltage range and frequency used.

The blue fittings are used for providing weather-proofed exterior sockets for outdoor apparatus. In camping situations, the large 32 A blue fittings provide power to static caravans, whilst the smaller blue 16 A version powers touring caravans and tents. The yellow fittings are used to provide transformer isolated V supplies for UK construction sites to reduce the risk of electric shock, this use spills over into uses of power tools outside of the construction site environment.

The red three-phase versions are used for three-phase portable equipment. IEC "Plugs, socket-outlets and couplers for industrial purposes" specifies general functional and safety requirements. IEC "Dimensional interchangeability requirements for pin and contact-tube accessories" applies to plugs and socket-outlets, cable couplers and appliance couplers with pins and contact tubes of standardized configurations. IEC "Particular requirements for plugs, socket-outlets and appliance inlets for use in explosive gas atmospheres" was withdrawn in IEC "Switched socket-outlets and connectors with or without interlock" applies to self-contained products that combine within a single enclosure, a socket-outlet or connector according to IEC or IEC and a switching device, with a rated operating voltage not exceeding V DC or AC and Hz, a rated current not exceeding A.

The standard includes preferred current ratings and wire gauges for both International and North American applications.

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Series I preferred current ratings are: 16, 32, 63, , , , and , with wire gauges specified as mm2. Series II preferred current ratings are: 20, 30, 60, , , , , and , with wire gauges specified as AWG and circular mil. IEC connectors come in IP67 variants. In both cases, the rating applies when detached or mated, but not during the mating process. The more common IP44 variant features a spring-loaded hinged cap over the socket. When a plug is inserted, the cap retains it in place.

Fixed connectors are installed angled downward to prevent water entering; the IP67 variant includes a twist-lock ring which seals the two together.

The two can be intermated, at the cost of the locking mechanisms. Plugs have cylindrical connector pins arranged in a circle, with the earth pin 2 mm larger than the others; this is surrounded by a circular shroud on the male connector, which fits into a matching recess on the female connector. The standard defines connectors with 3, 4 and 5 pins, but a non-standard variant with 7 pins is commercially available. Connectors rated at 63 A and A may optionally be equipped with a 6 mm pilot contact; this smaller pin in the centre of the connector is shorter than the others, designed to'make' after all the other pins when connecting a plug and socket, to'break' first when disconnecting.

It is used to switch off the load. This is useful as disconnecting under load will cause arcing which may cause damage to both the plug and socket, risk injury to the user. The pilot pin is located in the centre of main contact circle on 4- and 5-pin connectors. The standard specifies an additional, different design for extra-low voltages up to 50 V AC and currents of 16 or 32 A; this is larger than, the IEC DC connector.

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Three 6 mm pins From Wikipedia, the free encyclopedia. Computer Graphics Metafile Filename extension. List of International Electrotechnical Commission standards. International Electrotechnical Commission. Vector graphics markup languages and file formats. ISO standards by standard number.

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Graphics file formats. Category Comparison. Revision History. Vector graphics.


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Related Images. YouTube Videos. Usually, the term refers to computer-generated image data created with the help of specialized graphical hardware and software. It is a vast and recently developed area of computer science. A Blender 2. An iPod , an industrially designed product.

KitchenAid 5 qt. Stand Mixer, designed in by Egmont Arens, remains very successful today. Western Electric Model telephone , found throughout the United States from until the introduction of touch-tone dialing. Calculator Olivetti Divisumma 24 designed in by Marcello Nizzoli.

In electrical engineering, IEC is a set of technical standards for low-voltage power fuses. Neozed Fuse block for 3-phase AC. NH fuses of sizes 1, 2 and 3, rated A, A and A. A inch rack is a standardized frame or enclosure for mounting multiple electronic equipment modules. Each module has a front panel that is 19 inches wide.

Several inch racks in a professional audio application. Two IECstyle plugs inserted into wall-mounted sockets. IEC is an international standard designed "to provide a standard for a safe, compact and practical 16 A V AC system of plugs and socket-outlets that could be accepted by many countries as their national standard, even if not in the near future.