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Rack Mounting
UL Guidelines For Rack Mounting
The following Underwriters Laboratories (UL) guidelines are relevant to the safe installation
of these products in a rack:
1. Elevated operating ambient temperature — If the unit is 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 equipment in
an environment compatible with the maximum ambient temperature (Tma: +122 °F,
+50 °C) specified by Extron.
2. Reduced air ow — Install the equipment in the rack so that the equipment gets
adequate air flow for safe operation.
3. Mechanical loading — Mount the equipment in the rack so that uneven mechanical
loading does not create a hazardous condition.
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 the 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 (such as the use of power strips).
CAUTION: Use only the two holes indicated in figure 7 for mounting the MPA 401.
The other four holes anchor stand-offs for the internal circuit boards;
using them may damage the amplifier and will not provide secure
mounting for the unit.
#4-40 Thread Thru
Rack Mounting
#4-40 Thread Thru
Rack Mounting
Figure 7. Points for Securing the Base of the MPA 401 to a Rack
MPA 401-70V and MPA 401-100V • Mounting 15