Rack Mount Safety Instructions 
When installing the chassis in a rack, implement the following safety 
instructions: 
•  Elevated Operating Ambient - If installed in a closed or multi-unit rack 
assembly, the operating ambient temperature of the rack environment 
may be greater than room ambient. Therefore, consideration should be 
given to installing the equipment in an environment compatible with the 
maximum ambient temperature (Tma) of 40°C (104°F). 
•  Reduced Air Flow - Installation of the equipment in a rack should be 
such that the amount of air flow required for safe operation on the 
equipment is not compromised. 
•  Mechanical Loading - Mounting of the equipment in the rack should be 
such that a hazardous condition is not achieved due to uneven 
mechanical loading. 
•  Circuit Overloading - Consideration should be given to the connection 
of the equipment to the supply circuit and the effect that overloading of 
the circuits might have on overcurrent protection and supply wiring. 
Appropriate consideration of equipment nameplate ratings should be 
used when addressing this concern. 
•  Reliable Earthing - Reliable earthing of rack-mounted equipment should 
be maintained. Particular attention should be given to supply connections 
other than direct connections to the branch circuit (e.g., use of power 
strips.) 
 
  To install MP-124 in a 19-inch rack: 
1.  Remove the two screws located on one side of MP-124 (nearest the front panel). 
2.  Insert the peg on one of the brackets into the third air vent down on the column of air 
vents nearest the front panel. 
3.  Swivel the bracket until the holes in the bracket align with the two empty screw holes 
on MP-124. 
4.  Use the supplied screws to attach the bracket to the side of MP-124. 
5.  Repeat steps 1 through 4 to attach the second bracket to the other side of MP-124. 
6.  Position MP-124 in the rack and line up the bracket holes with the rack frame holes. 
7.  Use four standard rack screws (not supplied) to attach MP-124 to the rack.