Cambium Networks PMP 450 Series, Installation Manual

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Chapter 4: Preparing for installation 188
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Always power down and disconnect the equipment from its power source before servicing.
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The ODU power supply is the primary disconnect device.
Ext er nal cab les
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Use outdoor rated cables for connections that will be exposed to the outdoor environment.
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Install Cambium recommended cables.
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Safety may be compromised if outdoor rated cables are not used for connections that will be
exposed to the outdoor environment.
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For outdoor copper Cat5e Ethernet interfaces, always use Cat5e cable that is gel-filled and shielded
with copper-plated steel.
RF exp osur e near t he ant enna
Harmful levels of RF radiation are present close to the antenna when the transmitter is on.
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Observe the minimum safe distance limit for 450 products, see the Product leaflet or Configuration
guide
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Ensure that equipment is installed in a position avoiding any radiation hazard to humans.
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Always turn off the power to the ODU before undertaking maintenance activities in front of the
antenna.
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The units start to radiate RF energy as soon as they are powered up.
Gr ound ing and lig ht ning p r ot ect ion r eq uir em ent s
Structures, equipment and people must be protected against electrostatic discharge: -
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By siting ODU equipment in a lightning protection zone
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ODUs, external antennas and GPS receivers are not designed to survive direct lightning strikes. For
this reason they must be installed in Zone B as defined in Lightning protection zones on page 1.
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Mounting in Zone A may put equipment, structures and life at risk.
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By installation of appropriate lightning conductors to conduct the surge current to ground via a
separate preferential solid path.
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Ground bonding and transient voltage surge suppression is recommended. Use Cambium specified
surge suppressors.
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Grounding conductor runs are as short, straight and smooth as possible, with bends and curves
kept to a minimum.
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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.
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All bends, curves and connections must be routed towards the grounding electrode system, ground
rod, or ground bar.