2
Install Rack Enclosures
15
Mounting Auxiliary and DRd Rack Enclosures Together
Unison DRd and AX auxiliary rack enclosures are designed to be surface mounted on load
bearing walls in an electrical closet or a room with restricted public access. One DRd rack
may be bussed to the AX series auxiliary rack, which may contain a main circuit breaker
(MCB) or a main lug (ML) for power distribution to the adjacent DRd12 rack. Two DRd12
racks may be cross-bussed to an AX12X auxiliary rack which is designed to provide main
lug or main breaker input feed termination to the adjacent DRd12 racks.
The wall must be strong enough to hold all racks fully populated with modules, conduit and
wire. Reference
“Where to Install the Rack Enclosure,” page 7
for weight, dimension and
clearance requirements.
Step 1:
Determine where the enclosures will be installed using the weight and dimension
requirements detailed in
“Where to Install the Rack Enclosure,” page 7
.
Step 2:
Use the measured slot dimensions located in the graphics below to mark the hole
locations for the mounting hardware.
Step 3:
Drill the holes and install the mounting hardware for each rack enclosure.
• Four 3/8” (M8-M10) bolts or screws 2-4” (50-100mm) long, and suitable
wall plugs are suggested mounting hardware per rack enclosure (lag bolts
recommended).
• Both the surface and the mounting hardware must support the weight of
the enclosures fully populated with modules.
• Expose at least 1” (25mm) of threads for mounting the rack.
Step 4:
Remove the conduit knockouts from the mating side conduit plugs on the DRd
and auxiliary rack enclosures before installation. Only remove the knockouts that
are adjacent to another rack.
Step 5:
Install the DRd rack first (follow instructions as outlined in
“Mounting Individual
Racks on a Wall,” on page 13
. Remember to install the DRd rack enclosure to
either side of the auxiliary rack in cross-bussed applications.
Step 6:
Align the auxiliary rack against the DRd rack enclosure and mount it to the
previously installed hardware. Keyholes in the DRd and auxiliary rack enclosures
are aligned with each other for mounting to Unistrut or Kindorf. With conduit holes
mated, the bolt spacings are on 16” (406mm) centers (top left DRd and top left
Ax rack) for installation convenience.
432mm
17”
451mm
17.75”
194mm
7.64”
113mm
4.45”
160mm
6.3”
432mm
17”
62mm
2.44”
787mm
31”
406mm
16”
406mm
16”
330mm
13”
559mm
22”
559mm
22”
DRd12-48 rear panel view
