IEC 60297 PDF
IEC Dimensions of Mechanical Structures of the mm (19 in) Series Part 1: Panels and Racks. IEC Mechanical structures for electronic equipment – Dimensions of mechanical structures of the ,6 mm (19 in) series – Part Basic. IEC Dimensions of Mechanical Structures of the mm (19 Inch) Series Part 2: Cabinets and Pitches of Rack Structures.
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Large server rooms ieec often group rack cabinets together so that racks on both sides of an aisle are either front-facing or rear-facing, which simplifies cooling by supplying cool air to the front of the racks and collecting hot air from the rear of the racks.
Heavy equipment or equipment which is commonly accessed for servicing, for which attaching or detaching at all four corners simultaneously would pose a problem, is often not mounted directly onto the rack but instead is mounted via rails or slides.
The amount of motion and resulting stress depends on the structural characteristics of the building and framework in which the equipment is contained, and the severity of the earthquake.
These cases can be isolated by thick layers of foam or may use spring-loaded shock mounting.
Larger cases are further reinforced with additional plywood or sheet metal. Older equipment meant for round-hole or tapped-hole racks can still be used, with the use of cage nuts made for square-hole racks.
Examples include telephone exchanges, network cabling panels, broadcast studios and some government and military applications. The posts have holes in them at regular intervals, with both posts matching, so that each hole is part of a horizontal pair with a center-to-center distance of The hole pattern thus repeats every 1. Ina durable fiber reinforced plastic inch rackmount case was patented by ECS Composites and became widely used in military and commercial applications for electronic deployment and operation.
Slides or rails for computers and other data processing equipment such as disk arrays or routers often need to be purchased directly from the equipment manufacturer, as there is no standardization on such equipment’s thickness measurement from the side of the rack to the equipment or means for mounting to the rail.
This prevents circular airflows where hot exhaust air is recirculated through an adjacent device and causes overheating. However, not all equipment is suitable for this type of mounting. This page was last edited on 12 Decemberat Installation and removal of hardware in a square hole rack is very easy and boltless, where the weight of the equipment and small retention clips are all that is necessary to hold the equipment in place.
A series of studies led to the adoption of frames 7 feet 2. Occasionally, one may see fractional U devices such as a 1. A difficulty with forced air fan cooling in rack equipment is that fans can fail due to age or dust. A standard inch server rack cabinet is typically 42u in height, 19 inches Touring musicians, theatrical productions and sound and light companies use road case racks.
The earliest repeaters from were installed in ad-hoc fashion on shelves, in wooden boxes and cabinets. Servers and deep pieces of equipment are often mounted using rails that are bolted to the front and rear posts as above, it is common for such rails to have an adjustable depthallowing the equipment to be supported by four posts, while also enabling it to be easily installed and removed.
Patent 2,granted Oct. There is no standard for airflow and cooling of rack mounted equipment. From Wikipedia, the free encyclopedia. A key structural weakness of front-mounted support is the shear stress placed on the mounting rails and the leading edge of the equipment.
Racks are divided into isc, APC SX-range racksit is common for equipment that features 4-post mounting brackets to have an adjustable rear bracket. The height of the different panels will vary, Hole spacing is 25 millimetres 0.
Road case racks come in different heights based on the 1U standard and different depths. All Wikipedia articles needing words, phrases or quotes attributed Wikipedia articles needing words, phrases or quotes attributed from November Commons category link is on Ief. Patent 3,granted June 4, Thus, a 1U rackmount computer is not 1. When there is a large number of computers in a single rack, it is impractical for each one to have its own separate keyboard, mouse, and monitor.
As a result, 4-post racks have become common, with such racks featuring a mirrored pair of rear mounting posts.
Wikimedia Foundation servers as seen from the front. Square-hole racks allow boltless mounting, such that the rack-mount equipment only needs to ifc through and hook down into the lip of the square hole. Rack Cabinet Buying Guide, http: According to Telcordia Technologies Generic Requirements document GRCORE, during an earthquake, telecommunications equipment is subjected to motions that can over-stress equipment framework, jec boards, and connectors.
Threaded mounting holes in racks where the equipment is frequently changed are problematic because the threads can be damaged or the mounting screws can break off; both problems render the mounting hole unusable.
A variety of airflow patterns can be found, including front intakes and rear exhausts, as well as side intakes and exhausts. In other projects Wikimedia Commons.
End covers are typically secured with either a simple draw latch or a rotary cam “butterfly” latch, named for the shape of the twist handle. The term relay rack appeared first in the world of telephony. The posts are each 0.
The holes are large enough to permit a bolt to be freely inserted through without binding, and bolts are fastened in place using cage nuts. This gap allows a bit of room above and below an installed piece of equipment so it may be removed without binding on the adjacent equipment. Road cases are typically made from polyvinyl chloride PVC laminated plywood sides, joined by extruded aluminum 6029, steel corners, handles and latches. Many wall-mounted industrial equipment enclosures have inch rack rails to support mounting of equipment.
A blade server enclosure might require 10U. Once serial production started, they were built into custom-made racks, one per repeater. The polyethylene shell is not fiberglass reinforced and is not rigid. Non-isolated cases simply mount inch mounting rails inside the case.
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