3. When mounting multiple units in one cabinet, place a cooling fan rack between
each unit to maintain the specified environmental operating conditions for all
components.
4.3.2 Mount the rack chassis in a stainless steel enclosure
Prerequisites
If you are not running conduit into a stainless steel enclosure, confirm that the mounting
location provides a path to earth ground.
Procedure
1. Ensure the mounting location allows the door to open completely and allows
enough room to run conduit into the bottom of the box.
2. Using hardened steel bolts, attach all four mounting feet to unistrut rails.
3. Torque lock washers to 50 ft-lb.
4.3.3 Cable access
As a best practice, conduit should enter from the bottom of the enclosure. Power, sensor,
and communication cables should enter through separate conduit and be routed
separately inside the enclosure.
Prepare multi-pair bundled cable pulls
1. Determine the number of pulls you need based on the size and number of channels
supported by the junction box. In general, you need one pull per 6 channels. Do not
exceed 40% conduit fill.
The multi-pair cable normally has a diameter of 0.5 in., and will require a 1.5 in.
conduit run. Two multi-pair cable pulls will require a 2 in. conduit run.
2. Make multi-pair sensor cable pulls on the bottom left so you can easily route cables
along left side of enclosure.
Prepare power cables
1. Size the conduit according to plant codes and local regulations for running power in
the plant.
2. Make the power line pull to the bottom right rear of the enclosure to route power
cable along the right rear of the enclosure.
Prepare Ethernet cables
1. The CAT5 cable requires a minimum 0.5 in. conduit run.
2. Route the CAT5 cable along the bottom right front so that it is as far as possible from
the unit's power supply.
Enclosure mounting
MHM-97125-PBF-EN, R0 21
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