Chapter 5: Preparing for installation
Safety
Page 5-3
Primary disconnect device
The ODU power supply is the primary disconnect device.
External cables
Safety may be compromised if outdoor rated cables are not used for connections that will be
exposed to the outdoor environment. For outdoor copper Cat5e Ethernet interfaces, always use
Cat5e cable that is gel-filled and shielded with copper-plated steel.
RF exposure near the antenna
Strong radio frequency (RF) fields will be present close to the antenna when the transmitter is on.
Always turn off the power to the ODU before undertaking maintenance activities in front of the
antenna.
Minimum separation distances
Ensure that personnel are not exposed to unsafe levels of RF energy. The units start to radiate RF
energy as soon as they are powered up. Never work in front of the antenna when the ODU is
powered. Install the ODUs so as to provide and maintain the minimum separation distances from
all persons. For minimum separation distances, see
Calculated distances and power compliance
margins
on page
4-24
.
Grounding and lightning protection requirements
Ensure that the installation meets the requirements defined in
Grounding and lightning protection
on page
3-8
.
Grounding cable installation methods
To provide effective protection against lightning induced surges, observe these requirements:
Grounding conductor runs are as short, straight and smooth as possible, with bends and
curves kept to a minimum.
Grounding cables must not be installed with drip loops.
All bends must have a minimum radius of 200 mm (8 in) and a minimum angle of 90°. A
diagonal run is preferable to a bend, even though it does not follow the contour or run parallel
to the supporting structure.
All bends, curves and connections must be routed towards the grounding electrode system,
ground rod, or ground bar.
Содержание PMP 450d Series
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