What is the worldwide recognized standard for equipment mounting spacing for 482.6 mm (19 inch) equipment?

Question

Options

• AEIA-310
• BUL 1778
• CCSA C22.2
• DNEBS GR-63-CORE

• A
  80% (20)
• B
  8% (2)
• C
  8% (2)
• D
  4% (1)

Explanation

EIA-310 is the correct answer because it is the Electronics Industries Alliance standard that defines the physical dimensions for 19-inch rack-mounted equipment, including mounting hole spacing, rack unit height (1U = 44.45 mm), and panel dimensions - making it the globally recognized specification for this purpose. UL 1778 is a safety standard for uninterruptible power supplies, not a mounting dimension standard. CSA C22.2 is a Canadian electrical safety standard covering wiring and electrical equipment, unrelated to rack form factors. NEBS GR-63-CORE defines environmental and physical requirements for telecommunications equipment deployed in central offices, not general rack mounting geometry.

Memory tip: Think "EIA = Equipment In A rack" - EIA-310 is the one standard that governs how equipment physically fits into a 19-inch rack.

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