What is the nominal width in inches of the standard 19-inch relay racks?

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Multiple Choice

What is the nominal width in inches of the standard 19-inch relay racks?

Racks use a fixed mounting width so equipment can fit universally. The term “19-inch rack” comes from the distance between the vertical mounting rails where equipment is attached, which is 19 inches. That 19-inch measurement is the nominal width referenced for mounting, even though the actual outer cabinet width is larger and varies by design. So the nominal width of a standard relay rack is 19 inches.

Racks use a fixed mounting width so equipment can fit universally. The term “19-inch rack” comes from the distance between the vertical mounting rails where equipment is attached, which is 19 inches. That 19-inch measurement is the nominal width referenced for mounting, even though the actual outer cabinet width is larger and varies by design. So the nominal width of a standard relay rack is 19 inches.

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