STANDARD EIA 19″ Racking

EIA-310 is a specification for what is often called the “standard rack”. This specification standardizes several important features of 19″ racks, such as the Rack Unit (RU or U), vertical hole spacing, horizontal hole spacing, rack opening, and front panel width. The specification also set tolerances on each of these dimensions. The EIA-310 specification has been the 19″ racks standard for equipment for 50 years. The items that the specification does not cover are the real reason for the industry wide incompatibility we now face. Rack features such as hole type, rack mounting depth, front and rear space, and obstructions between front and rear rails are the cause of real rack headaches. Vertical Hole Spacing Vertical hole spacing is defined as a repeating pattern of holes within one Rack Unit of 1.75″. The hole spacing alternated at: 1/2″ – 5/8″ – 5/8″ and repeats. The start and stop of the “U” space is in the middle of the 1/2″ spaced holes. See the diagram below. Horizontal Spacing The horizontal spacing of the vertical rows of holes is specified by EIA-310 at 18 5/16″ (18.312)(465.1 mm). This dimension is not well maintained on some racks, causing problems with equipment installation. Many manufacturers use equipment mounting slots instead of holes to allow for variations in this dimension. STANDARD EIA 19 Horizontal Spacing of Rack Rack Opening Front Panel Width of Rack Rack Opening The opening in the rack is specified as a minimum of 17.72″ (450mm). 2Post or relay racks tend to have a larger than normal opening, as do many other racks with threaded holes. Square hole racks tend to be very close to the minimum opening. Front Panel Width.The only dimension on a 19″ rack that actually measures 19″ is the width of the front panel of equipment.
 




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DDB Unlimited is an OEM NEMA Outdoor Enclosure Manufacturer. We provide a large variety of standard sizes from 16" to 90" high and from 25" to 42" deep with adjustable and reversible EIA 19"/23" racking rails, front and rear doors and 3 point, pad locking handles. Designed for the telecommunication industry, our enclosures can be deployed in harsh outdoor environments both rural or residential.

DDB manufactures a wide variety of NEMA 4 & 4x NEMA enclosures & offers accessories such as enclosure air conditioners, Heaters, Fans, Batteries and Power options. DDB's large stocked inventory allows for the industries fastest lead times, we offer quick and easy payment via credit cards & our enclosures are made in the USA. DDB is a ISO 9001 registered company.

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