Allied Telesis IE048-480, Руководство по установке

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Chapter 2: Beginning the Installation
36
Reviewing Site Requirements
Observe the following requirements when choosing a site for the device:
General Site
Requirements
Listed below are general site requirements:

You must install the power supply in a restricted access area.

You must install the power supply on a DIN 35x7.5mm or
35x15mm top hat DIN rail.

Do not operate the power supply on a table, desk, or shelf.

The site should allow for easy access to the connectors on the
front, top and bottom of the device, so that you can easily connect
and disconnect cables, and view the LEDs.

The power supply should be located near the powered devices to
keep the DC power wires as short as possible to minimize voltage
loss.

The site should not expose the device to moisture or water.

The site should be a dust-free environment.

Do not place objects on top of the power supply.

Mounting orientations affect maximum operating temperature
capability. Allied Telesis recommends the vertical mounting
orientation.

Electromagnetic interference might occur between switches and
other devices when multiple switches are powered by a single DC
power supply. This can be addressed by installing clamp-on ferrite
beads on the DC power cables, between the DC power supply and
switches.

The site should include dedicated power circuits or power
conditioners to supply reliable electrical power to network devices.
Indoor or
Outdoor
Enclosure
Requirements
The power supply does not require an enclosure for most indoor
environments, with the following exceptions:

The power supply must be installed in a UL-listed or Nationally
Recognized Test Lab (NRTL) enclosure when used in
Measurement, Control, or Laboratory environments.
Warning
The device must be installed in a fire protection enclosure when
installed on walls of combustible material (e.g., wood). Additionally,
the floor area directly below the power supply should be non-
combustible (e.g., metal or concrete) and be free of combustible
material (e.g., paper, plastic, or wood).
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