Extron Electronics MBD 249 - Manual

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.
• For rack mounting instructions, see the procedure below.
• For through-desk mounting instructions, see the next page (reverse side).
Rack mounting
UL rack mounting guidelines
The following Underwriters Laboratories (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, the operating ambient temperature of the rack environment may be greater than
room ambient temperature. Therefore, install the unit in an environment compatible with
the maximum ambient temperature (Tma) specified by Extron.
2. Reduced air flow — Install the equipment in a rack so that the amount of air flow required
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
effect that circuit overloading might have on overcurrent protection and supply wiring.
Appropriate consideration of equipment nameplate ratings should be used when
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 (for example, use of power strips).
Instructions
Step 1 — Attach brackets to the device
Attach brackets to the device using eight machine
screws supplied with the mounting kit. Use the
bracket’s four lower holes, as shown in the
diagram below.
Step 2 —
Attach brackets to
the rack
Using four machine
screws, attach the
brackets to the
mounting rack.
MBD 249
2U Rack Mount
Bracket (use four
lower holes)