19-inch rack

The term rack ( from the English for " rack ", " shelf " or " stand" ) is a borrowed from the English name for a holding device which typically summarizing a number of smaller elements into a single unit - such as a stand or a frame.

In electrical engineering, one speaks generally of a rack.

19 -inch racks

In the data center operations and events equipment, laboratory and control engineering, the term rack (English 19 - inch rack ) for a frame for electrical appliances with a standard width of 19 inches, in which the individual units ( " slots "), which in itself can be mounted rack having a front panel width of exactly 48.26 centimeters ( ≙ 19 " ) (eg: rack). One rack unit ( RU, in English also rack unit [ U, rare: RU] ) is 1.75 inches ( ≙ 4.445 cm ) specifies a module unit (MU ) for the module width within a drawer with 1/5 inch ( ≙ 5, 08 mm).

The 19 -inch rack system is for good compatibility standardized ( EIA 310 -D, IEC 60297 and DIN 41494 SC48D ). The front panel of the plug are therefore a multiple of a unit of height, which corresponds to 1.75 inches. For some latitude when entering and particularly expansion of front panels are even 1 /32 inch (corresponding to 0.787 mm) subtracted. Attached are the devices with 4 screws in the rows of holes vertically running metal bracket near the front edge of the shelf ( shelf). These plates are about 2 mm thick (steel: at least 1.9 mm, Alu: stronger) and each 5 /8 inch (15.88 mm) wide and form a 450.85 mm (equivalent to 19 " 2x minus 5/8 "= 17.75 " ) wide opening. The horizontal rows of holes have 465.14 mm ( 18 5 /16 ") center to center distance. The rack unit ( 1.75 " ) are three holes in two intervals of 15.88 mm (0.625 " ) about each other, the distance from the first hole of the next unit of height is 12.70mm ( ≙ 0,5 ' ) somewhat less so results in a visible rhythmic repetition of the hole spacing. The holes are in the U.S. rather threaded holes: The fine # 10-32 ( tpi ) UNF (approx. 4.8 mm outer diameter), or the coarser UNC threaded # 12-24 (approx. 5.5 mm) and 1/ 4 "( 20 tpi ) (6.35 mm ), rarely occur metric M5 or M6. Low-cost is the equipment of plates with square or round punched holes are used only snap or cage nuts if needed in the.

Buyer of network cabinets is always to pay attention to the dimensions of the devices to be installed. Cabinets are always in outside width and depth outside. Only the installation height is estimated in HE. With market conditions, for example, would a cabinet 42 HE 600 × 800 This means that the cabinet has a useful screening of 42U, whereas 600 mm External width and 800 mm External depth. The usable inside width and inside depth varies from manufacturer to manufacturer and must be observed.

Information Technology

Standard racks for data centers are about 2 meters high and usually offer a net area of 42 HU. They are available in depths of 60, 80, 100 or 120 cm and widths of 60, 70 or 80 inches. The larger widths provide additional lateral space for a structured cabling or for the power supply. The racks can be closed with side walls or doors to closets.

A slot for Einsteckplatinen or assemblies in Euro - board format (100 × 160 mm) is 3 units high and includes 84 HP, which offer eg when VMEbus up to 20 boards Course ( per board are 4 TE expected ), right and left are each 2 TE for the terminating resistors are required. For larger boards the double Euro format ( 233 × 160 mm) with 6 U used.

Sound and lighting equipment

Also in the sound and lighting technology, the use of equipment has prevailed, which can be mounted in racks. They are used mainly in the field of PA and studio equipment, including equalizers, amplifiers, effects, Channel strips and dynamics processors. Racks for stage technology are designed as flightcase.

Trivia

The 19 -inch rack system is an example of how to develop a very complicated, based on different primes standard time. In addition to the 19 and the vertical part unit with 7/ 4 " also on primes " overall width, the horizontal part unit with 1/ 5, " based. The horizontal spacing of the mounting holes 293 /16 ", while the width between the bars 71/4 " is. The height divided unit is asymmetric, so that the vertical spacing of the mounting holes in the above described alternating with 1 /2 "and 5/8" are also based on primes.

The standards (see above) are also some lengths to approach as in millimeters, even in these defined (eg 450 mm clear width between the rails and 465 mm mounting hole spacing ).

Furniture

The term is also used for rack shelves for storage or presentation of a hi-fi and TV sets. This hi-fi rack, or TV racks do not have any standardized widths and are usually the appearance and size of the hi-fi equipment adjusted. For the preparation of these materials, such as stainless steel racks, aluminum, glass or wood is used mostly.

Drum Racks

When rack is called a frame to which the different parts of a drum kit are fixed, ie mainly toms and cymbals, occasionally other instruments such as percussion and special effect tools.

Traditionally, one needs to build a drum kit a plurality of posts: At most one or maximum two tom toms can be mounted on the bass drum, if you take the over spell in purchasing; otherwise each basin and each drum ( with the exception of the bass drum ) mounted on its own stand, the tom-toms, however, often in pairs (two on a stand ) or on fixed-mounted legs ( floor toms ). This structure has the consequence that the drummer is surrounded by a tangle of legs, which can also easily slip on slippery ground. Since virtually every stand has three feet, even the space is often scarce, especially when even microphones are placed.

An alternative to this conventional structure provides the rack with few legs (two to four) of the ability to suspend a plurality of individual instruments. For this, the legs with horizontal cross members are connected to which holders for cymbals, drums and other instruments are screwed. Established as a standard has the rack with an electronic drum set. If you use two bass drums the rack is also standard.

More racks

• The International Standard Payload Rack is the mounting base for research modules of the International Space Station (ISS).

• The mini rack or 10 -inch rack is a smaller version of the 19 - inch rack, which is less deeply in the rule. Use it takes place primarily in the private sector and in smaller installations. Partial particularly small cabinets in the 19- inch pitch are called mini- racks. Many cabinets are suitable for wall mounting.

• 23- inch rack ( = 584.2 mm) are common in the telecommunications sector - a standard Western Electric with mounting holes in a regular 1 inch center distance.