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Installation Guide — MBD 249
(Continued on reverse side)
The Extron
®
MBD 249 Under-Desk Mount Kit (part number 70-155-01) lets you attach an Extron
2U high device to an equipment rack or through a desk or table.
• Forrackmountinginstructions,seetheprocedurebelow.
• Forthrough-deskmountinginstructions,seethenextpage(reverseside).
Rack mounting
UL rack mounting guidelines
ThefollowingUnderwritersLaboratories(UL) guidelines pertain to the safe installation of
electronic equipment in a rack.
1. Elevated operating ambient temperature — If installed in a closed or multi-unit rack
assembly,theoperatingambienttemperatureoftherackenvironmentmaybegreaterthan
roomambienttemperature.Therefore,installtheunitinanenvironmentcompatiblewith
the maximum ambient temperature (Tma) specified by Extron.
2. Reduced air flow—Installtheequipmentinaracksothattheamountofairowrequired
for safe operation of the equipment is not compromised.
3. Mechanical loading — Mount the equipment in the rack so that a hazardous condition is
not achieved due to uneven mechanical loading.
4. Circuit overloading — Connect the equipment to the supply circuit and consider the
effectthatcircuitoverloadingmighthaveonovercurrentprotectionandsupplywiring.
Appropriateconsiderationofequipmentnameplateratingsshouldbeusedwhen
addressing this concern.
5. Reliable earthing (grounding) — Maintain reliable grounding of rack-mounted equipment.
Pay particular attention to supply connections other than direct connections to the branch
circuit(forexample,useofpowerstrips).
Instructions
Step 1 — Attach brackets to the device
Attach brackets to the device using eight machine
screwssuppliedwiththemountingkit.Usethe
bracket’s four lowerholes,asshowninthe
diagrambelow.
Step 2 —
Attach brackets to
the rack
Using four machine
screws,attachthe
brackets to the
mounting rack.
MBD 249
2U Rack Mount
Bracket (use four
lower holes)